“BLL 066 ay} Wd) SjeJaUIW pUe $4901 Jo sasAjeuy Asesqy) Ayssaajun wee sey 30 Hew Dork HState College of Agriculture At Cornell Aniversitp Bthaca, #2. DB. Library DEPARTMENT OF THE INTERIOR UNITED STATES ‘GEOLOGICAL SURVEY GEORGE OTIS SMITH, DirREcTOoR BULLETIN 419 ANALYSES OF ROCKS AND MINERALS FROM THE LABORATORY OF THE UNITED STATES GEOLOGICAL SURVEY 1880 TO 1908 TABULATED BY F. W. CLARKE, Cuter CHEemist WASHINGTON GOVERNMENT PRINTING OFFICE 1910 CONTENTS. PTL POG AST io ne casts aterreaeereprteas et otal BS A ear Patna Syst hanes nieces The average composition of rocks.............. 0000200 cee cece cece eee eeeeee Analyses of igneous and crystalline rocks Malnes ce: fic aasneiosntaseacc omens 1. Rocks from Aroostook Count: 2. Miscellaneous rocks New: Hampshire j4.i-e.sceekag oe ee wk occ o essai ckaeiy ae a uangee x oechnes Wermonte oesuvsheeenilise a2 aie cra diy tel eiisiea seems uae 1. Rocks of Mount Ascutney........--..20 0200-00000 0022 cee ee ce eee 2. Miscellaneous rocks................. Secunia ce area eer coinen he an eas Massachusetts................-. A. ties a Srepeuaraiegh secon epee eS Re ee do Maen Seid toCke 22.0644 sae-scus aaewemnaidensineae eee Sauae eels ele 2 SAT TD OlItG = cccceaa Oo ata ates toss achsavee SNA wad lec eempcet eee 3. Miscellanéotis rocks: se... 2. sacasddiicmasyeareys oheebeeasceaas es Connecticutssjs.i sce cewuseu ese us'sd <5 Soest ede eeed eye oe seamed Neon Work sete. view ianiii dou ae nl eave 4d Mapa ea el SS acl 1. Rocks of the Adirondack region...............0.20..00..2000000005 2. Miscellaneous rocks..-.......-......-2-202-02 22-22 e eee eee eee cess IN@W JeTSOY S253 5.0212 sass eeunaur hes aoomes a oS eeaaoaiahe Ree adhe heSee Perinay lant a sa.c2.5 an aceincn ce dau © .aGdae bye lane ee SM aaa aaerans Maryland and the District of Columbia.._.................-...2.-0-+----- I. Beridotite and. PyTOKeNite. oj ..022 eee enaenenchewepies ee eeuees sess 2, Gab brovand -dionte vc sisase Sees Gig GSA asta weee coals 3; (Granite andvonelss sc. ssc ecue ae asiaeiweoimennad ane erase 4. -Miscellaneotis: Tockes.....iici0v wicca cout ol ae egeeeeGniee ee ees so ecie's Vifginlaeeons sec eses aise ten cee sees sesce1a4 +s asses Se Soe Sy cee bes North Carolinains:scssmtecentes ss ose sas poe aueeese dase Wey eoteseea st GEOTRIA Sooo siesiesietaleisaecendeves eines Se ee Sane Se eee Se seas e Ree Pees ee Kentucky. nccireuses daa ahacectieisiee $ho2 565.04 A anmnnniguee ooed sane 1, Elliott: County dike... cccsioee csc sees eeieeecdieanee ddnesecces 2. Crittenden County dike..............2...2.-2..-222-222-2-222-0-- TON CSSCC 52a sad cicieiets ects ee tcdawnes yee dees dese dardaaedewmamaa aes ees MissOUMlesdciiyksti wn aa olisiine eee eed Sa eine SRe ARON HSS OSES Take: Superiot 6gi0tcc.scccciawaeiietss te acinc 2a aeddwe gaan as 2846 take 1. Marquette region, Michigan...............2---2-.-2-0 +0222 eee eee 2. Crystal Falls district, Michigan............--.-.--+-.+-2-4---+--- 3. Keweenaw Point, Michigan..............--.--2.------22---+-+--- 4, Menominee Riveriss.sceveveaecercsees cee cse ceeae cei eee ceases: Sturgeon Falls gabbro. ...2 40: oscaus sevesieeseuseaeeetes gaz eges ees Lower Quinnesec Falls...........0-000 2022 .e cess cesses feeeeees Upper Quinnesec Falls...........-- 2 didi S dobeanwusloveeessiaa NE Newnes Schist from the Aragon iron mine...........-.+-++-+++--+2-++-+- IV CONTENTS, Analyses of igneous and crystalline rocks—Continued. Lake Superior region—Continued. Page. 5. Penokee-Gogebic region. ........-----++-+ 222222222 eee eee 50 6. Pigeon Point, Minnesota... ....-.--------- +--+ 5-2-2 e reer eee 51 7. Mesabi district, Minnesota. ........-.------ +--+ -+-2++eee ee eee eee 54 8. Miscellaneous rocks from Minnesota. .....-----------+-+---+++----- 55 South Dakota ..cc.-.csece eye ss 24 dedeeeeielece ae eee veces ees 57 Wyoming. .... 22. --20 2 eee eee eee cee etree tee 57 Yellowstone National Park and the Absaroka Range......-.-.----------- 60 le Bléctrie: Pea les.cacs aceana canny ngncccteese see 322244 BAe eeenes = 60 2. Sepulchre Mountain. .......-.... 202-2222 eee eee ee eee eee eee 62 3. Absaroka Range: ccs2scscareneandueaiie faeries aerate ye 63 Crandall Basin: 3c)... 2 tisecaseacsaae ones ec nncd eaeheredeiee ees 63 Sunlight intrusives. ..........------2- 22-2 e eee eee ee eee eee 65 Ishawooa Intrusives: coc: scesveieeseeeleceis eases coerce ts 65 . Dikesanbreela.: -vseeaexeaedseceeis oh. 2 ee vins : aaetoeene tess 66 4, Absarokite-shoshonite-banakite series...........-..---2-----2---- 67 5. Miscellanéous rocks: .. 2)... ccccdaees ce cet feeee segs eeeeeedsae yes ss 70 Montana«ssccanoe 225555 eamyonb ees ebanerees bose heey ees eee ress 74 1. Madison and Gallatin valleys...........-...-.--..2--------+--+- 74 oo Butte districty..a nesses eanteeaacse piece sd awa hades stees 77 3, Boulder batholith:...0...0..cccscac yes ieess eres eeemerees phos 79 4, Crazy Mountains yao. we a o _opse SRESSLASN E. Massive, coarse, altered diabase, Leverett. Ornose. Contains saussuritic feldspar with black hornblende. Analysis by Eakins, record No. 1325. P. R. C. 1640. F. Tonalite, South Leverett. Andose. Dark green, chloritic. Contains reddish feldspar, dark hornblende, and a network of dark-green epidotic quartz veins. Analysis by Eakins, record No. 1326. P. R. C. 1641. 15619—Bull. 419—10—3 22 ANALYSES OF ROCKS AND MINERALS, LOdU—LUUd. G. Biotite granite, Moore’s quarry, Florence. Lassenose. Very feldspathic. Quartz rare, with fluid inclusions. Feldspar mostly triclinic, orthoclase and micro- cline present in small quantities. Little muscovite, some rutile. Analysis by Eakins, record No. 1414. P. R. C. 1642. Rocks E, F, and G are described by Emerson in Mon. XXIX. H. Holyokeite, east foot of Mount Tom, Northampton. Probably tuolumnose. Described by Emerson in Jour. Geology, vol. 10, p. 508. Contains albite, 70 per cent; orthoclase, 9.4 per cent; calcite, 16.4 per cent, with minor amounts of ilmenite, dolomite, chalcopyrite, pyrite, and apatite. Analysis by W. F. Hillebrand, record No. 1924. P. R. C. 1648. Ke H20 at 105°. - 15 \ 1.47 \ 1.53 } 68 ae WO 9:2 cmtcesisiate 1.97 -91 10 86 COG: sc cesiesecense on waite eee aRSs 2S Heer liars ki esaapedert eee Ee tiatabe [ean cine | eerie | Aaaeiaineid 7.47 LAE Og apts secrets iste ens cha see Hat tees = MRSA ASN Da SSNS He Db easel leieeaaiossetal te Rutidl giassse ll eveye ecotevere 02 PIO Bo cccosmwaniinnnaesmeennanwiaiaelan:s am nas ewe saree ara keMaeeR ee seeks 09 alt trace ll a ace erg VR Tu ta tena Store ec cicalie SF hed nec gcienhaimha ec Mey cacie Mtns kactstade (ais vatele aiaiad| eM aha ana [tw eet eee werd vara al? Mno trace 11 | trace | undet. BOO s saseuenanisy. smentar goenepyey nr Cyrene ates pr ataataes trace 2 farasienion OU escue-wecsunsss tees seeeaaiee sete ee ree eR Geek oe wet nemiteieomicsies cee cin leteie norelececismers | seomeetand 14 100. 25 | 100.12 | 100.37 99. 77 Analyses I to P are of rocks collected by B. K. Emerson, and as yet, with two exceptions, undescribed. I, Gneissoid granite, north well of Flint’s quarry, Monson. Amadorose. Analysis by W. F. Hillebrand, record No. 1924. P. R. C. 1645. J. Gneissoid granite, Frawley’s quarry, Erving. Tehamose-toscanose. Analysis by George Steiger, record No. 1941. P. R. C. 1648. K. Gneissoid granite, Alderman’s quarry, Becket. Toscanose-lassenose. Analysis by Steiger, No. 1944. P. R. C. 1649. L. Gneissoid biotite granite, Wood’s quarry, Pelham. Toscanose., Analysis by Steiger, No. 1960. P. R. C. 1650. I J K. L IO a accra sin hS eraser eared SRS eenice bie baaeseEE Ende anes 65.02 | 74.15 | 70.62 72.45 AlzOs 18.37 | 13.35] 15.31 13.32 Fe203 1.21 1.26 1.06 1.93 FeO. 2.06 -53 -43|*° .63 MgO 1.49 - 23 29 44 CaO 6. 20 1.92 1.30 1.81 INGO cmpanirreigiguyeneeis da ae ceemunen cnc etenmeateaisd actnoetibraeinaaanaAe 3. 96 2. 84 4,55 3.55 KO weenie moar teeter oer stata ig hapten ase eatin encarta ra » 64 4.58 4.01 3. 86 FASO at 105? ee cverecemaee oh ane aa sera wire ie ernh ferences = se recse - 09 -13 16 -59 H2O above 105°... M. Aplite (alsbachite), Fallon Hill, Enfield. Kallerudose. Garnetiferous biotite granite dike. P. R. C. 1651. N, Another sample, same locality as M. Lassenose-alsbachose. P. R. C. 1652. IGNEOUS AND CRYSTALLINE ROCKS. 23 Analyses M, N, by George Steiger, record No. 1975. O. Quartz diabase, west of Ashley reservoir, Holyoke. Vaalose. Contains calcite and radiated quartz. P. R. ©. 1653. P. Palagonite, from blebs in O. Analyses O, P, by Steiger, No. 2039; rocks described by Emerson in Bull. Geol. Soc. America, vol. 16, p. 91. M. N. 0 P 53. 52 40. 35 9.70 5.11 8.06 24.99 9.45 3.55 2. 52 5. 48 5. 64 1.32 2, 24 -18 1.50 1.44 1.67 8.51 2.16 8.51 1.98 - 20 HOST lheveseee care 1.02 none 9G) |ons cea 10 none 26 ioe 100. 21 99. 86 Q. Granite gneiss, Hoosac Mountain. Toscanose. Contains quartz, microcline, albite, muscovite, biotite, magnetite, titanite, epidote, apatite, and zircon. Analysis by E. T. Allen, record No. 2064. P. R. C. 1718. R. Albite schist, Hoosac Mountain. Varingose. Same minerals as in Q, with garnet and pyrite. Same analyst and number. P. R. C. 1719. Rocks Q and R collected by J. E. Wolff, but not yet described. The following feldspars, all albite, separated from schists of the same region, are described by Wolff ir Mon. XXIII, pp. 60 and 187. Analyses by R. B. Riggs, record Nos. 507 and 567. 8. From feldspathic schist, central shaft of the Hoosac tunnel. P. R. C. 129. T. U. From the porphyritic mica schist of Greylock Mountain. @ Fe203 less than 0.5 per cent. > Loss on ignition. V. Pyroxene-titanite aplite, South Peru. Analysis by W. T. Schaller, record No. 2143. W. Diorite, railroad cut west of Ironstone. Analysis by I. |. Sullivan. X. Pre-Cambrian quartzite gneiss, Northbridge. Analysis by Sullivan. Rocks V, W, X, collected by B. K. Emerson, but no description furnished. 24 ANALYSES OF ROCKS AND MINERALS, 1880-1908. CONNECTICUT. A. Olivine basalt, main flow, Pine Hill, South Britain. Auwvergnose. Contains plagioclase, pink augite, olivine, and magnetite. The rock is quite fresh. P. R. C. 1456. B. Olivine basalt, anterior flow, South Britain. Contains plagioclase, uralitized augite, olivine, and magnetite. Rock much altered, and containing numerous amygdules of calcite and prehnite stained by iron. P. R. C. 1457. Rocks A and B are described by W. H. Hobbs in 21st Ann. Rept., pt. 3, p. 60. Analyses by W. F. Hillebrand, record No. 1842. C. Basic pitchstone (tachylyte), from the so-called ‘‘ash bed” northeast of Meriden. SR. 1-2 of auvergnase. Described by Emerson in Bull. Geol. Soc. America, vol. 8, p. 77. Analysis by H. N. Stokes, record No. 1641. P. R. C. 1654. a Calculated as pyrite. IGNEOUS AND CRYSTALLINE ROCKS. 25 The following rocks, D to H, are from Prospect Hill, west of Litchfield. Collected by W. H. Hobbs, who furnishes the petrographic data: D. Mica-hornblende gabbro. Bandose. Contains plagioclase, hypersthene, biotite, . subordinate green hornblende, and magnetite. P, R. G. 1677. E. Homblende diorite. #essose. Contains plagioclase, green hornblende, sub- ordinate biotite, and magnetite. P. R. C. 1678. F. Hornblendite. III. 6. 4. 4, 5. Almost entirely green hornblende. Contains also magnetite, a little biotite, and very little plagioclase. P.R.C. 1679. G. Cortlandtite. IV. 17. 17, 2. Mainly hypersthene, with subordinate olivine, green hornblende, and magnetite. P. R. C. 1680. H. Hornblende norite. Awvergnose. Contains greenish hornblende and a little more hypersthene. Rich in plagioclase, with accessory biotite and magnetite. P. R. C. 1681. Analyses D, G, H, by W. F. Hillebrand, record No. 2074; E and F by George Steiger, record No 2071. ..| trace? |.-. 100. 12 99. 92 99.75 The following rocks were collected by G. F. Loughlin. Petrographic data supplied by H. E. Gregory. Analyses by G. Steiger. I. Gabbro, near northeast boundary, between Preston and Griswold. Contains plagioclase, pyroxene, hornblende, epidote, zoisite, chlorite, serpentine, pyrite, ilmenite, apatite, and a little calcite. J. Quartz diorité, 1 mile east of Preston City post-office. pyrite, ilmenite, apatite, and zircon. Contains quartz, plagio- clase, little orthoclase, hornblende, little biotite, rare muscovite, epidote, zoisite, K. Granite dike, southern slope of Barnes Hill, North Stonington. Contains quartz, orthoclase, oligoclase, biotite, muscovite, titanite slightly altered to leuco- xene, epidote, chlorite, ilmenite, pyrite (?), zircon, andapatite. Somewhat kaolinized. L. Amphibolite dike, east base of Prospect Hill, northwest of Preston City post- office. Contains plagioclase, hornblende, epidote, ilmenite, pyrite, apatite, and a little kaolin and sericite. 26 ANALYSES OF ROCKS AND MINERALS, 1880-1908. ¢ I J I. L SIO 8 cearetcrara ce vaccensste snione a2 a satay edomeraia messes cevanue acne ieee Ee Oe Sa 47.63 Al2O3.. 15. 49 Fe.03. 2.60 FeO... 8.70 MBO! cs sieissein 8.40 CAO iseeccines 10. 04 NapO.....---- 3.09 WO wees orice - 36 H20 at 105°..... 35 H20 above 105°. 1.78 iO 1.93 ma 22 PE ait paariurmadelaraabinoeates none 100. 70 NEW YORK. 1, ROCKS OF THE ADIRONDACK REGION. Collected by J. F. Kemp, who furnishes the petrographic data. A and G, together with the four iron ores, are described by Kemp in 19th Ann., pt. 3, p. 383. Analyses A and B by George Steiger, record No. 1715; C to K by W. F. Hillebrand, record Nos. 1714 and 1717. A. Wall rock of iron mine near Lincoln Pond, Elizabethtown. Camptonose. Varies from norite to gabbro. Chief minerals, green augite, hypersthene, brown hornblende, plagioclase, and magnetite. Microperthitic feldspar less common. Garnet varies from absence to abundance. B. Coarse gabbro, top of Whiteface Mountain. Hessose. A pyroxenic phase of the anorthosite. Contains much labradorite, abundant light-green augite, brown hornblende, shreds of more or less bleached brown biotite, and magnetite. 100.75 | 100.51 @ Mainly present as pyrrhotite. C. Pyroxenic anorthosite, Elizabethtown. Hessose. Contains largely labradorite, subordinate light-green augite, less brown hornblende, and a little magnetite. D. Norite, with close affinity to gabbro. Camptonose. Intrusion in C. Contains labradorite, hypersthene, garnets, green augite, brown hornblende, a little brown biotite, magnetite, and apatite. E. Diabasic norite or gabbro, Elizabethtown. -Auvergnose. Contains the same minerals as D. IGNEOUS AND CRYSTALLINE ROCKS. 27 F. Gneissoid derivative, by pressure, of E. Camptonose. The same minerals, but with hornblende more abundant. G. Gabbro, wall rock of Split Rock mine. Hessose. Contains augite, hypersthene, brown homblende, garnet, plagioclase, magnetite, and possibly spinel. P. R.C. 1471. 1.20 - 56 86 81 12 -10 12 18 48 65 73 43 3. 37 1.18 2. 54 1.20 57 14 - 33 20 (@) +02) (2) (?) 02 -02 03 02 24 22 = 26 16 trace | trace} trace trace 35 23 -07 12 14 -06 il 07 99.98 | 99.64] 99.77] 100.02 ZrOz, Cl, and F not looked for. CrgO3, LizO, and SrO present in traces. S is, in part at least, present as pyrrhotite. The following titaniferous magnetites, from Elizabethtown, are regarded by Kemp as being of magmatic origin, and are therefore included in this tabulation. H. Near Lincoln Pond. I. Oak Hill pit. J. Tunnel Hill. K. Split Rock mine. H and I are classed by Washington as Adirondackiase, J and K as Champlainiase. 2. MISCELLANEOUS ROCKS. A. Peridotite, from Dewitt, near Syracuse. A rock described by Darton and Kemp, Am. Jour. Sci., 3d ser., vol. 49, p.456. Contains olivine, partly serpentinized, biotite, and augite, with magnetite, apatite, and perofskite. Possibly a little chromite also. Classed by Kemp as limburgite. P. R. C. 296. 28 ANALYSES OF ROCKS AND MINERALS, 1880-1908. Analysis by H. N. Stokes, record No. 1491. The FeO represents the total iron, because the sulphides present, possibly as pyrrhotite, prevent the separate estimation of the two iron oxides. B. Syenite, Fort Ann, Washington County. -Adamellose. Contains orthoclase, microperthite, hornblende, green augite, and a little quartz. C. Quartz-biotite-gamet gneiss, Fort Ann. Consists essentially of quartz, garnet, biotite, orthoclase, some plagioclase, and zircons. B and C were collected by J. F. Kemp, who supplies the petrographic data. Analy- ses by W. F. Hillebrand, record No. 1930. NEW JERSEY. Rocks A, B, and © described by J. P. Iddings in Bull. 150, pp. 254, 209, 236. Analyses by Eakins, record No. 1299. A. Basalt, Watchung Mountain, Orange. Auvergnose. Contains pyroxene, mostly malacolite, plagioclase, magnetite, and glass, with variable amounts of ser- pentine or chlorite. The feldspar is partly altered into a mineral which is probably prehnite. P. R. C. 102. B. Eleolite syenite, Beemersville. Beemerose. Contains nephelite, orthoclase, zgirite, and biotite, with melanite, sphene, apatite, zircon, and magnetite in smaller amounts. Sodalite is probably present also. P. R. C. 78. C. Minette, Franklin Furnace. Contains alkali feldspar, biotite, monoclinic pyroxene, magnetite, epidote, calcite, chlorite, apatite, sphene, pyrite, and a little secondary quartz. P.R.C. 91. D. Nepheline syenite, Brookville. Viezzenose. Collected by N. H. Darton and described by F. L. Ransome in Am. Jour. Sci., 4th ser., vol. 8, p. 417. Contains alkali feldspars, nepheline largely altered to secondary minerals, brown amphibole, biotite, cancrinite, plagioclase, muscovite, segirine-augite, apatite, titanite, fluorite, and afew specks of magnetite. Also secondary analcite, sericite, and natrolite (?). Analysis by Steiger, record No. 1807. P. R. ©. 223. IGNEOUS AND CRYSTALLINE ROCKS. 29 A B. c D 53.56 | 40.71 | 54.68 24:43 19.46 | 21.63 219| 7.46] 2.22 1.22| 6.83] 2.00 "31 | 6.21] 1.25 1.24] 11:83] 2:86 6.48 | 1.80] 7.03 9.50 | 3.25 | 4.58 .93 Hi £33), 4 Rocks E to J collected by W. 8. Bayley, who describes E, F, Gin Folio 167. Analy- ses by W. T. Schaller, record Nos. 2252, 2255. E. Pochuck gneiss, Greenwood Lake quadrangle. Contains oligoclase, ortho- clase, diopside, hornblende, hypersthene, biotite, magnetite, and quartz. F. Byram gneiss, 1 mile west of Hibernia. Contains potash feldspars (micro- perthite), but less hornblendic and pyroxenic minerals than the Pochuck gneiss. G. Losee gneiss, northeast of Berkshire Valley, Lake Hopatcong quadrangle. Contains plagioclase, quartz, diopside, hypersthene, biotite, apatite, magnetite, zircon, and titanite. H. Augitic Losee granite, Lake Hopatcong quadrangle. I. Intermediate gneiss, Oxford tunnel, Hackettstown quadrangle. J. Micaceous Oxford gneiss, Oxford tunnel. K. Quartz-orthoclase-augite rock, near Marion Station, Jersey City. Collected by J. Volney Lewis. Analysis by Schaller, record No. 2261. 100.36 | 99.54 | 100.62 | 100.12 | 100.62 | 99.84 99. 97 PENNSYLVANIA. A. Aporhyolite, Monterey, Franklin County. Kallerudose. Described by Flor- ence Bascom in Bull. 150, p. 343. Contains alkali feldspar, quartz, sericite, epidote, titaniferous magnetite, leucoxene, and rarely sphene. Analysis by H. N. Stokes, record No. 1479. P. R. C. 136. 30 ANALYSES OF ROCKS AND MINERALS, 1880-1908. B. Quartz porphyry, same locality. Alaskose. Analyzed for G. H. Williams, but never described. Analysis by L. G. Eakins, record No. 1350. C. Baltimore gneiss. Yellowstonose. Contains quartz, orthoclase, microcline, oligoclase, biotite, hornblende, magnetite, and minor accessories. P. R. C. 1701 to 1705. D. Mica gneiss. III. 3.2.8. Consists chiefly of quartz and muscovite, with feld- spars and minor accessories. P. R. C. 1707 to 1710. E. Hornblende gneiss. Auvergnose. Contains largely green hornblende and colorless anthophyllite, with plagioclase, magnetite, and scanty secondary quartz. P. R. €. 1710 to 1711. F. Hypersthene gabbro. Hessose. Contains quartz, orthoclase, labradorite, diallage, hypersthene, magnetite, apatite, and minor accessories. P. R. C. 1712 to 1714. Rocks ( to F are average samples collected by F. Bascom within the Philadelphia quadrangle. Analyses by W. F. Hillebrand, record No. 1872. The mica gneiss is described in the Cecil County volume of the Maryland Geological Survey. G. Sericite schist, Pine Grove Furnace, South Mountain. Collected by G. W. Stose. Analysis by W. T. Schaller, record No. 2302. @ Loss on ignition. MARYLAND AND THE DISTRICT OF COLUMBIA. 1, PERIDOTITE AND PYROXENITE. Rocks A to I, inclusive, described by G. H. Williams in Am. Geologist, vol. 6, p. 35. A. Porphyritic lherzolite, Johnny Cake road, Baltimore County. SR. 1 of baltt- moriase. Contains olivine, bronzite, and diallage, the olivine partly serpentinized. Analysis by T. M. Chatard, record No. 1094. B. Websterite, Johnny Cake road. Baltimorose. Consists entirely of hypersthene and diallage. P. R.C. 110, and 1740. C, D. Alterations of B. Maricose. B,C, and D dried at 104° P.R.C. 1741. E. Smaragdite rock, altered pyroxenite, Dogwood road, Baltimore County. Cecilose. ; Analyses B, 0, D, and E by J. E. Whitfield, record Nos. 975, 976. C, D, and E are from the laboratory record and do not appear in the published paper. IGNEOUS AND CRYSTALLINE ROCKS. 31 F, G. Two samples of websterite, Hebbville, 6 miles west of Baltimore. Web- sterose. P. R. C. 1742. H. Bronzite from G. P.R. CG. 1743. I. Diopside from G. P. R. C. 1744. The rock consists entirely of bronzite and diopside. Analyses by T. M. Chatard, record Nos. 1094, 1123. J. Websterite, Oakwood, Cecil County. Cecilose. Composed of hypersthene and diallage. Analysis by W. F. Hillebrand, record No. 1755. Described by A. G. Leonard in Am. Geologist, vol. 28, p. 135. K. Cortlandtite, Ilchester, Howard County. Cortlandtose. Analysis by W. F. Hillebrand, record No. 1422. Published by Williams in 15th Ann., p. 674. The rock consists of olivine, pyroxene, and large hornblende crystals, the latter consider- ably altered to tale. P. R. 0. 1745. 100. 48 | 100.52 | 100.56 | 98.84 | 100. 47 | 100.15 2. GABBRO AND DIORITE. Rocks A to E, inclusive, described by G. H. Williams, but not in detail, in 15th Ann., pp. 673, 674. Some of the rocks, with other analyses, are discussed by him in Bull. 28. Analyses by W. F. Hillebrand, record No. 1422. “ A. Olivine gabbro, Orange Grove, Baltimore County. JV. 71°. 12. 2. Contains plagioclase, diallage, hypersthene, fresh olivine, magnetite, and apatite, and some- times hornblende. P. R. C. 1746. 32 ANALYSES OF ROCKS AND MINERALS, 1880-1908. B. Hypersthene gabbro, Wetheredville, Baltimore County. Kedabekose. Rich in hypersthene and diallage, with plagioclase, magnetite, and apatite. P. R. C. 1747. C. Gabbro diorite, Ilchester, Howard County. Hessose. A coarse anorthite-horn- blende rock, probably an altered gabbro. P. R. C. 1748. D. Biotite diorite, Triadelphia, Montgomery County. Bandose. P. R. C. 1749. E. Biotite diorite, Georgetown, D.C. Bandose. P. R. C. 1750. To these may be added an analysis made for Williams by L. G. Eakins, record No. 1350, as follows: , F. Hornblende diorite, Rock Creek tunnel shaft, Washington, D.C. III. 4. 4. 4, 5. Relations to E not stated. A B Cc D. E F. 55.97 | 56. 41 56. 18 15.60] 15.19 | 14.76 1,21 1. 60 2.12 6. 28 6. 24 6.98 6. 83 7.18 8.11 7.31 6.77 7.97 2.93) 2.21 1.62 1. ae 1. fe - 80 185] 200 } 1.37 1.11 #09, Vesscecmes -16 05 08 sEveesee ald |eewmnests -04 405) |e sceamex 08 alt. 17 trace | trace |!......- 100.10 | 100.06 | 100.16 The following rocks, from Cecil County, are described by A. G. Leonard in Am. Geologist, vol. 28, p. 135. G. Quartz-mica-hornblende diorite, near the foundry on Stone Run. Bandose. Contains hornblende, biotite, quartz, plagioclase, and a little orthoclase, with acces- sory zircon, apatite, titanite, and magnetite, and secondary chlorite and epidote. H. Like G, near Porter’s Bridge on Octoraro Creek. Bandose. I. Hornblende diorite poor in quartz, three-fourths mile northwest of Rising Sun. Corsose. 4 J. Norite, 1 mile west of Oak Grove schoolhouse. Kedabekose. Contains hypers- thene, bytownite, a little diallage, apatite, magnetite, and secondary hornblende. Analyses by Hillebrand, record No. 1755. G. H. I J 55.16 | 44.04 48.02 17.51 | 20.01 20.01 2.62 4, 22 1.13 5.83 8.61 7.29 4.35 5.01 10. 05 8.50 | 11.68 11.42 1.83 1.24 51 1.08 «15 -05 18 1 -10 2.01 1.90 87 64 2.24 23 21 52 trace 02 .10 none 04 05 02 trace | none 03 01 01 01 15 28 18 trace | none none trace none none trace | trace trace 03 25 11 none | none 25 IGNEOUS AND CRYSTALLINE ROCKS. 33 3. GRANITE AND GNEISS. For descriptions see Williams, 15th Ann., p. 657, and Keyes, idem, p. 685. The Rowlandsville granite is described by Grimsley in Jour. Cincinnati Soc. Nat. Hist., vol. 17, p. 78. A. White granite, Brookville, Montgomery County. Liparose. (Williams.) P. R. C., 1751. B. Binary granite, Guilford, Howard County. Toscanose. Contains quartz, ortho- clase, a little plagioclase, muscovite, and biotite, with occasional zircon and apatite. (Keyes.) * C. Biotite granite, Woodstock. Toscanose. Light colored, fine grained. Quartz, feldspar, and biotite, with accessory allanite and epidote. (Keyes.) D. Biotite granite, Rowlandsville, Cecil County. Tonalose. Dark colored. Con- tains plagioclase, orthoclase, quartz, epidote, biotite, sphene, magnetite, and apatite, with a little secondary muscovite. The percentages of the several minerals are com- puted by Grimsley from the analysis. Analyses by W. F. Hillebrand, record Nos, 1220, 1422, 1455. In B and C manganese was present, barium and strontium were not tested for, and the alumina contains possible titanium and phosphoric acid. 59 -77 1.58 1.02 1.12 3.32 30 51 2.19 16 47 64 1509 undet. | undet. 50 undet. |undet. -10 undet. | undet. 10 undet. | undet. trace undet. | undet. - 08 trace | trace trace 99.89 | 99.96 | 100.17 | 100.32 E. Biotite granite, Dorseys Run, Howard County. Yellowstonose. Typical, dark colored. Quartz, feldspar, and biotite, with accessory allanite and epidote. (Keyes.) P.R. C., 1752. F. Same locality, light-colored dikes. Toscanose. G. Inclusions in E. SR. 2 of tonalase. Derived from gneiss. H. The typical gneiss of the Dorseys Run area. Perhaps of sedimentary origin. Descriptions by Keyes. Analyses by Hillebrand. The remarks appertaining to B and C apply here also. Record No. 1220. 34 ANALYSES OF ROCKS AND MINERALS, 1880-1908. I. Biotite granite, Sykesville. Tehamose. Contains quartz, feldspar, and biotite, with accessory magnetite, zircon, and apatite. J. Inclusion in I, derived from limestone. Yellowish central portion. Consists of epidote and quartz, with a little chlorite. K. Same inclusion, fine-grained dark outer zone. Quartz, garnet, and epidote, with a little magnetite. Feldspar and muscovite in some portions. Descriptions by Keyes. Analyses by Hillebrand, record No. 1220, with the same limitations as in the Guilford, Woodstock, and Dorseys Run granites. I J K. 67. 02 47.35 13.77 29. 76 4.64 2.94 1.02 3.15 -65 1.60 11.09 2.20 66 2.84 09 6.83 1.16 3.15 trace trace 99.94 | 100.10 99. 82 L. Typical gneiss of Washington, D. C., from quarry. of Potomac Stone Company, 1 mile below Chain Bridge. A “‘basic” granite. M. Fine-grained, fissile chloritic gneiss, from northwest of Cabin John Bridge. Also a ‘‘basic” granite. P. R. C. 1753. N. Fine-grained, hard gneiss, from the second lock at the Great Falls of the Potomac. Alsbachose. Probably of sedimentary origin. Described by Williams. Analyses by Hillebrand, record No. 1459. 4. MISCELLANEOUS ROCKS. A. Typical diabase, Rocky Ridge. Auvergnose. Analyzed for J. S. Diller, but not described. Analysis by E. A. Schneider, record No. 1370. B. Ottrelite-phyllite rock, Liberty, Frederick County. Analyzed for G. H. Wil- liams, but not described. P.R. C. 1754. C. Chloritoid separated from B. Analyses B and C by L. G. Eakins, record No. 1349. D. Quartz schist, Shoemaker quarry, near Stevenson Station, Green Spring Valley. Described by Bayley in Bull. 150, p. 302. Contains quartz, muscovite, occasional tourmalines, microcline, zircon, and iron stains. Analysis by Schneider, No. 1370. P. R. C. 119. E. Mica separated from D. Analysis by Schneider, No. 1377, I IGNEOUS AND CRYSTALLINE ROCKS. 35 F. Sericite schist, Ladiesburg. Described by Bayley in Bull. 150, p. 317. Con- tains quartz, sericite, chlorite, a mineral thought to be kaolin, zircon, iron oxide, and rutile. Analysis by George Steiger, record No. 1600. P. R. C. 126. G. Another sample of F. Analysis by Schneider, No. 1370. H. Metarhyolite, south of Port Deposit. Dike. Vulcanose. Described by F. Bascom, in Maryland Geological Survey, Cecil County volume, p. 136. Contains quartz, orthoclase, plagioclase, biotite, and hornblende, with accessory magnetite, apatite, titanite, garnet, pyrrhotite, and muscovite, and secondary chlorite and epidote. Analysis by W. F. Hillebrand, record No. 1928, P.R. C. 1706. 99.68 | 100. 29 99. 93 a Uncertain because sulphides are present. VIRGINIA: A. Andesite, 3} miles east of Front Royal. SR. 4 of orendase. Described by Keith in 14th Ann., p. 305. Intermediate between diabase and quartz porphyry. Contains plagioclase, quartz, magnetite, ilmenite, and a little epidote. Analysis by George Steiger, record No. 1450. B. Porphyritic felsite or felsophyre, forks of Straight Creek, 3 miles east-northeast of Monterey. Toscanose. Described by Darton and Keith in Am. Jour, Sci.. 4th ser., vol. 6, p. 305. Contains phenocrysts of biotite, orthoclase, and plagioclase, the mica and feldspar being about equal in amount. In the groundmass are feldspar, quartz, magnetite, or ilmenite, and a little secondary chlorite with less muscovite. No glass. Analysis by Hillebrand, record No. 1665. P. R, C. 342. 50 ANALYSES OF ROCKS AND MINERALS, 1880-1908. aA. B SiOe. 51.08 69, 56 Al203 11. 37 15. 52 Fe203 11.17 1.67 FeO. 5. 64 1.19 GON pa hd cscs daa yensde a epee cree ee ates Ae teartce ei eat 3.96 41 ONO ees es Seca ocaywseselscanh eta eae bie SPCR Ogre ost hae acks Seabee Bie 5.20 1.20 Naa) 5 wis saci oaicrrnaneie seine odmencwired moadaucine meseasess = SeocReenwediamuee aA 5.54 4.46 DIR Oey ecg ied tc ee eh a at peg pn aS edaceh ny pe No and RSIS pe aie 1.50 4.68 OMAR TO co ccansscnstsnaraisaenin ty aiestanedintnsmnstoiniies 20 aoa ahers natn ya MOREE NERC TE wets 1.31 .34 TSO OMEN NO cca ssscts cca siseecresatoirstsnatoascians oi sear teayeietelsaeate erctenziatigl zi chaveaciecateemcceetatasaiate nies tae -19 67 NORTH CAROLINA. Rocks A to F collected by Arthur Keith, who furnishes the petrographic data. Analyses B, C, D, and E by W. F. Hillebrand, record No. 1707. Analyses A and F by H. N. Stokes, record No. 1710. A. Porphyritic rhyolite, 2 miles west of Barmers Elk, Watauga County. Adamellose. Contains orthoclase and plagioclase, with less quartz, epidote, chlorite, and pyrite. B. Quartz porphyry, 24 miles northwest of Blowing Rock, Watauga County. Mag- deburgose. Contains quartz and orthoclase, with subordinate sericite, chlorite, and biotite. C. Diorite, east end of Hump Mountain, Mitchell County. Awvergnose. Contains plagioclase, orthoclase, and hornblende, with less quartz, biotite, magnetite, and garnet. D. Garnetiferous diabase, 1} miles southeast of Cranberry. JII. 4.4.4,5. Contains plagioclase and hornblende, with less garnet, biotite, and magnetite. A B. Cc D SiO 62.35 | 79.75 | 46.91 52.11 AlzO3 13.24 | 10.47 | 15.85 13.70 3. 52 64 2. 86 1.22 FeO. 6. 33 92 9.95 9. 86 MgO 85 +13 7.01 8.08 Cao. 3.34 15 9. 62 12.16 Na2O 2.79 1.36 2. 65 1.31 Ke 3.95 6.01 - 69 16 1,0 at 110°.... SINREN SY a Pee BE Zsa ae anaemic ie batekssiaja/adbiecs ell - 08 ~24 -06 E120 BDOVC NO! 2 sess teas aitiet o nicies eogssia ising e teraiditee dobar Heomisintspeeielesaiea 1.21 - 60 1.62 - 53 IGNEOUS AND CRYSTALLINE ROCKS. 37 E. Epidote-chlorite schist, one-fourth mile northeast of Montezuma, Mitchell County. Contains epidote and feldspar, with less chlorite, hornblende, and magne- tite. F. Metamorphosed amygdaloid, 3 miles southeast of Boone, Watauga County. Contains orthoclase and plagioclase, with less sericite, chlorite, and magnetite. G. Pyroxenite, var. websterite, from Webster. Websterose. Described by Wil- liams, Am, Geologist, vol. 6, p. 35. Consists of diopside and bronzite. Analysis by E. A. Schneider, record No. 1096. Material dried at 105°. P. RB. C. 388. H. Spherulitic rhyolite, Sam Christian gold mine, Montgomery County. Alaskose. Described by Diller, Am. Jour. Sci., 4th ser., vol. 7, p. 337. The rock of the supposed fossil Palxotrochis. Contains feldspar and quartz, with a little biotite and sericite. Analysis by Hillebrand, record No. 1796. 99.74 | 100.36 | 100.02 The following rocks from Corundum Hill were collected, analyzed, and described by T. M. Chatard, Bull. 42, p. 45. I, Altered gneiss. Made up of micaceous scales, with grains of quartz and some earthy matter. Record No. 238. J. Dunite. Dunose. Olivine rock containing a little chromite. Record No. 256. K, L. Yellow, claylike alterations of dunite. Record Nos. 254, 255. Other analyses of altered rocks are given in the paper, and also analyses of associated minerals. 15619—Bull. 419—10—4 38 ANALYSES OF ROCKS AND MINERALS, 1880-1908. GEORGIA. Rocks collected by A. H. Brooks, who supplies the petrographic data. Analyses by H. N. Stokes. Record No. 1727. A. Meta-quartz diorite, 2 miles southwest of Sweden, Gordon County. Gordonose. Contains plagioclase, near labradorite, green hornblende, sometimes diallage, much vitreous quartz, and accessory magnetite, ilmenite, and orthoclase. Also secondary epidote, zoisite, uralite, chlorite, garnet, calcite, and leucoxene. P. R. C. 1530. B. Augite-microcline granite, 1 mile east of Rowland, Bartow County. Toscanose. Contains microcline, some plagioclase, abundant pyroxene partly‘altered into chiefly uralite and chlorite, some biotite with frequent inclusions of rutile, much blue vitre- ous quartz, apatite, zircon, and magnetite. P.R. C. 1531. C. Quartz gabbro, 2 miles southeast of Walleska, Cherokee County. Harzose. Closely related to B. Contains essentially plagioclase, near labradorite, and augite. Accessory magnetite, ilmenite, apatite, and zoisite. Orthoclase is sparingly present. Quartz occurs in vitreous masses. P. R. C. 1532. : A B. Cc SEO ae cicictctcarnanelecai inaciahe arm eater ae eaictata Vetere A ygd OS Ree Seen 69.87 | 67.98 56. 20 PANG O 5 jacarch ciececvevermeteictane As Lanier are-orsiausioinetfermneais GREE iasee taped iy aS asa eked SLADE 12.02] 14.84 15. 46 Bb O piece ate ale eta teron seensenicnaieensey 1. 42 1.00 1.54 FeO. 3. 49 3.15 9.76 MgO 2. 30 91 1.83 CaO. 7.86 2.17 5.39 Na2O 66 2. 66 2.78 Ke Oh soo cre cesnesAniesicie sidicyain cic Gininis Baie Bi 23 SEES RING es oo eerNRIaslaRiaae eclaciereroes vl, 4.76 2. 56 ERe@ sat THOM oo 2s ycicides ccwisustaiciniemuaincigale 32d cheese Se mai eee eve 18 -14 -16 FsOrabOve V0? 2 seiko saitemeecciecd s teeeeaescueuide 2 Bee aees weeeteees: - 89 49 - 59 TO) eccestes se, ate an Sud antec eperagaqnitg aie 2 Perea essences seis Sis ake eecniticeae ees 69 84 2.25 ai. 34 1.13 trace -13 - 20 WV KENTUCKY. 1, ELLIOTT COUNTY DIKE. Described by Diller in Bull. 38. Also in Am. Jour. Sci., 3d ser., vol. 32, p. 125. A peridotite, var. kimberlite, consisting largely of olivine, sometimes altered to serpentine. Pyrope, ilmenite, a few scales of biotite, a little enstatite, and a trace of apatite are present as primary minerals. Secondary minerals are serpentine, dolomite, magnetite, and octahedrite. A granitic rock occurs with the peridotite. It consists chiefly of feldspar, ortho- clase, and plagioclase, with a considerable amount of quartz and ilmenite, and traces of hornblende, sphene, and apatite. Analyses by T. M. Chatard, record Nos. 272, 273, 282, 305, 351, 352, 353, 354, and 358. A. Granite. Monzonose. B. Peridotite (kimberlite). P. R. ©. 799. (, Olivine from peridotite. D. Garnet from peridotite. E. Ilmenite from peridotite. IGNEOUS AND CRYSTALLINE ROCKS. 39 The following analyses are of sedimentary rocks adjoining the dike: F. Calcareous sandstone. G. Fine-grained fissile sandstone. H. Indurated shale. I. Fragment of shale included in the peridotite. Il was dried five hours at 110° previous to analysis. 2. CRITTENDEN COUNTY DIKE. A mica peridotite, described by Diller in Am. Jour. Sci., 3d ser., vol. 44, p. 286. Contains biotite, serpentine, and perofskite, with less apatite, muscovite, magnetite, salcite, chlorite, and some other secondary products. P. R. C. 800. A. The rock described by Diller. SR. 1 of casseliase. Analysis by W. F. Hille- brand, record No. 1241. B. An analysis of probably the same rock, from a shaft 40 feet deep at Marion. Collected by J. R. Procter, analyzed by L. G. Eakins, record No. 965. 40 ANALYSES OF ROCKS AND MINERALS, 1880-1908. TENNESSEE. Gabbro, 2 miles south of Limestone Cove, Unicoi County. Camptonose. Col- lected by Arthur Keith, who furnishes the petrographic data. Analysis by W. F. Hillebrand, record No. 1707. Contains hypersthene, plagioclase, and magnetite. MISSOURI. Rocks A to D, granite and porphyry, 6 miles east of Ironton. Described by Ha- worth in Missouri Geol. Survey, vol. 8, Annual Report, pp. 140, 180, and 213. Anal- yses by W. H. Melville, record No. 1206. A, B. Granite. A, P. R. C. 1027; B, P. R. C. 1028. C, D. Porphyry. ©, P. R. C. 1029; D, P. R. C. 1030. Rocks composed principally of orthoclase and quartz, with some microcline, plagi- oclase, and biotite, and minor accessory minerals. A is toscanose; B, C, and D are liparose. E. Devonite, Mount Devon. Hessose. Collected and described by A. Johannsen. Contains phenocrysts of a plagioclase rich in potassium. The groundmass consists of feldspar and augite, with titaniferous magnetite and chlorite. Analysis by W. F. Hillebrand, record No. 2350. a little 2? trace? 99.32 | 100.17 | 100.04 | 99.81} 100.32 2 Equivalent to 0.07 §. Assumed to be pyrite, no pyrrhotite being present. IGNEOUS AND CRYSTALLINE ROCKS. 41 ARKANSAS. Ouachitite, dike near Maple Spring, 4 miles southwest of Hot Springs. SR. 2 of etindase. Described by Kemp, in Ann. Rept. Geol. Survey Arkansas, 1890, vol. 2, p. 399. A dike rock of the monchiquite group. Contains abundant and conspicuous augite and biotite, magnetite, and minor accessory minerals in a groundmass con- sidered by Kemp to be glass. Calcite and other secondary products are also present. According to Pirsson, Jour. Geology, vol. 4, p. 679, the so-called ‘‘glass” in the monchiquites is really analcite. Analysis by L. G. Eakins, record No. 1023. P.R.C. 395. SLO Sp sscusese ania acts cagineied deine otoe cme s BOAO) If WoO ccd aoadanwasels wn Cawornanvnadvedvn ter dnatowaae 3.01 TA 5 Ose elk Gea rR LA ee Sree AN IOAD Tl 9 Oe eoetyere arava eh ad epe lore generar iat 2.36 GIO 9 2 5ick Scstynsc sete atoteeakaGcamRereniwt BL2F || WO gs eicc.ecceceerse oa eee coments sacar -42 GO ha. cseateneGeaimbaterbaresceuemenenseen BBS) | Ba Opis sxe a cnrsinnaemiessis cineintenegenicicisisieies en 1.04 INES OF sce es ase csercacas sie rs tcrtacnssierate ms este skede ect WA CO gs cscs tyres peel hetoaninaaiicnee ran eanasean 3.94 COO visisiccision cmcinstha netinckmeritentwcnsece 14. 46 ——— N89 Oke csenciona sae veggtawaeaerosaceens tor -97 99. 84 OKLAHOMA. Granite, west of Mount Sheridan, Wichita Mountains, collected by J. P. Iddings. Analysis by G. Steiger, record No. 2335. SiOz... AlaO3... ZrOz and COs absent. TEXAS. A. Quartz pantellerite, Vieja Mountains, San Carlos, Presidio County. Liparose. Description furnished by E. C. E. Lord, Contains anorthoclase, augite, and grains- of quartz in a groundmass of egirine-augite, a brown hornblende which is probably barkevikite, orthoclase, and quartz. Magnetite and apatite are present as accessory minerals. Analysis by George Steiger, record No. 1581. The following rocks, analyses B to. M, from Uvalde County were collected by T. Wayland Vaughan. Petrographic data furnished by Whitman Cross. Analyses by W. F. Hillebrand, record No. 1681. B. Plagioclase basalt, Pinto Mountain, Brackett quadrangle. Limburgose. Con- tains olivine, augite, plagioclase (labradorite), biotite, a very little alkali feldspar (?), magnetite, and apatite. Sp. gr., 3.118, 20° P. R. C. 1067. C. Basanite, Mount Inge, Uvalde quadrangle. Lujavrose. Contains sanidine, nephelite, hornblende, augite, wgirine-augite, olivine, magnetite, apatite, and a trace of pyrite. Sp. gr., 2.770, 20°. P. R. C. 1069. D. Rock of basaltic habit, allied to C, 1 mile northeast of Big Mountain, Uvalde quadrangle. Essexose. Contains alkali feldspar, augite, magnetite, and variable amounts of olivine, nephelite, zgirite, biotite, and zeolitic minerals. Sp. gr., 2.742, 23°, P. RB. C. 1068. 42 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 48. 23 @ Including CrzO3. E. Phonolite, hill between Black and Big mountains, Uvalde quadrangle. Laur- dalose. Contains sanidine, nephelite, and egirite, and very little brown hornblende, augite, and magnetite. Sp. gr., 2.559, 19.5° P. R. C. 1070. F. The portion of E soluble in 1:40 dilute nitric acid. G. Nepheline basalt, Tom Nunns Hill, Uvalde quadrangle. Uvaldose. Contains olivine, augite, nephelite, magnetite, and apatite. Sp. gr.,3.148,19°. P.R. C. 1065. H. The portion of G soluble in 1:40 dilute nitric acid. es "s o a Co ey on NESS BSRSE o~_mt ~wN Ce. IGNEOUS AND CRYSTALLINE ROCKS. 43 I. Nepheline basalt, Black Mountain, Uvalde quadrangle. Uvaldose. Contains olivine, augite, nephelite, magnetite, and apatite. Sp. gr., 3.200, 21.5° PL R.«, 1066. J. The portion of I soluble in 1:40 dilute nitric acid. K. Augite from I. Violet in color, very pure. L. Nepheline-melilite basalt, from about 3 miles southwest of Uvalde. Casselose. Contains nephelite, melilite, olivine, augite, magnetite, and apatite. Sp. er., 3.150, 20.5° PLR. C. 1064. M. The portion of L soluble in 1:40 dilute nitric acid. Rocks N to U collected by R. T. Hill in the trans-Pecos region. Descriptions sup- plied by Whitman Cross. Analyses by W. F. Hillebrand, record No. 1901. N. Rhyolite, summit of Chisos Mountain, Big Bend of the Rio Grande. Liparose near alaskose. Pink porphyry. Rich in alkali feldspars and quartz, with very little riebeckite and barkevikite (?). Sp. gr., 2.602, 15.5° O. Rhyolite, near Shafter, Shafter quadrangle. Liparose near alaskose. Pheno- crysts of sanidine and quartz. Groundmass of alkali fieldspars, quartz, riebeckite(?), and egirite. Spherulitic bands traverse the rock. Sp. gr., 2.617, 15.5° P. Rhyolite, north summit of Chisos Mountain. Liparose. Consists chiefly of alkali feldspars and quartz, with riebeckite and a little magnetite. Sp. gr., 2.611, 15.5° Q. Rhyolite, west of Paisano Mountain, Alpine quadrangle. Liparose. Contains alkali feldspars, quartz, arfvedsonite, and eegirite. Sp. gr., 2.635, 15.5°. 44 ANALYSES OF ROCKS AND MINERALS, 1880-1908. Cl and F not looked for. R. Grorudite, about 2 miles north of the summit of Chisos Mountain. Grorudose- pantellerose. Contains alkali feldspars and subordinate quartz, with riebeckite and egirite in irregular interstitial patches. Sp. gr., 2.648, 15.5°. S. Pulaskite, Santiago Mountain. Nordmarkose. Consists of alkali feldspars, with subordinate egirite, «girite-augite, riebeckite, magnetite, and rare lovenite. Sp. gr., 2.581, 25.5°. T. Syenite porphyry, Iron Mountain, near Marathon. Nordmarkose. Contains many oligoclase-albite phenocrysts in a groundmass of alkali feldspar, with very little quartz. Titanite, apatite, and magnetite are present in small amounts. Sp. gr., 2.577, 15.5°. U. Essexite, Big Hill Canyon, Rio Grande. ssexose. Contains predominant orthoclase, soda-rich plagioclase, and nephelite, with considerable augite, olivine, and magnetite, and small amounts of biotite and apatite. Sp. gr., 2.686, 25.5° V. Syenite porphyry, Hueco Tanks, El Paso County. Phlegrose near nordmarkose. Collected and described by G. B. Richardson. Contains orthoclase, albite, oligoclase, biotite, augite, quartz, ilmenite, magnetite, and apatite. Analysis by G. Steiger, record No. 2162. IGNEOUS AND CRYSTALLINE ROCKS. 45 LAKE SUPERIOR REGION. 1. MARQUETTE REGION, MICHIGAN. Rocks mostly described by Van Hise and Bayley. When not otherwise specified the descriptions have been published in Mon. XXVIII, and partly in 15th Ann., p. 485. A. Peridotite, near Opin Lake, E. } sec. 27, T. 48 N., R. 27 W. Marquettose. Contains diallage, olivine, magnetite, and plagioclase. The diallage is partly chlori- tized, and the olivine is partly serpentinized. Analysis by W. F. Hillebrand, record No. 1452. P. R. C. 996. B. Altered greenstone, Marquette district. Camptonose. Analysis by George Steiger, record No. 1586, hitherto unpublished. P. R. (. 988. C. Griinerite-magnetite schist, sec. 11,T.47N., R.27W. Mainly impure griinerite, with magnetite and quartz. Analysis by W. H. Melville, record No. 1403. P. R.C. 984. D. Like C, from sec. 18, T. 47 N., R. 28 W. Analysis by Melville, record No. 1403. P.R. C. 980. E. Like C and D, from sec. 20, T. 46 N., R. 30 W. Analysis by H. N. Stokes, record No. 1546. ©, D, and E are similar schists, and alike in mineralogical compo- sition. P. R. C. 981. \ B Cc. D E SiO sau a xeieneseernde ton touts so ou te estate Ramee eee 39.37 | 48.85 | 46.94] 49.70 46. 25 Al20O3 4.47 | 15.83 - 66 1.35 92 FeO; 4.96| 2.50}; 4.51] 3.10] 30.62 FeO 9.13 | 10.79 | 33.72] 37.19 16.92 MgO 26. 53 5. 82 6.64 5.72 2.13 CaO 3. 70 6. 20 3. 22 68 1.69 N820 ects nanramanmiie 2 ragmiqonaswes acieenaueineti erst eae ee - 50 2.79 -16 | trace none RO eo cteyecesg msarcterctaguises cigisueienaciemaiciais Gs eteeercnare imac ia a meneame Re +26 PSST? | evesteaiersencs |imtereccrored none H20 at 110°... 87 aor H20 above 110 F. Green schist, sec. 34, T. 48 N., R. 27 W., near center of section. Contains plagioclase, chlorite, and quartz. Analysis by George Steiger, record No. 1447. P.R. C. 986. G. Sericite schist associated with the preceding. Mainly sericite and quartz. Analysis by Steiger, No. 1447. P. R. C. 985. H. Dark-gray, foliated schist, southeast corner of sec. 30, T. 47 N., R. 30 W. Con- tains quartz, plagioclase, orthoclase, and biotite. Analysis by Steiger, No. 1525. P.R. C. 991. : I. Schistose gneiss, NW. } sec. 35, T. 47 N., R. 26 W. Contains quartz, kaolin, sericite, plagioclase, chlorite, magnetite, and apatite. Analysis by Steiger, No. 1525. J. Novaculite from Marquette. Described by Williams in Bull. 62. Contains quartz and sericite. Analysis by W. F. Hillebrand, record No. 759. 46 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 2. CRYSTAL FALLS DISTRICT, MICHIGAN. Rocks described by J. Morgan Clements and H. L. Smyth, in Mon. XXXVI. A,B, C, and D by Smyth, p. 274. Analyses by H. N. Stokes, record No. 1721. A. Granite, sec. 2,T.41N.,R.30W. Magdeburgose. Contains quartz, orthoclase, microcline, plagioclase, biotite, muscovite, magnetite, hematite, titanite, and occa- sional apatite. B. Gneiss, sec. 35, T. 42 N., R. 29 W. Same minerals as in A. C. Mica schist, sec. 35, T. 42 N., R. 29 W. Contains biotite, quartz, some micro- cline, and magnetite. . D. Amphibolite, sec. 32, T. 42 N., R. 28 W. Contains hornblende, plagioclase, biotite, and quartz, with a little rutile and magnetite. A B Cc. D SiOsekims wsnseceeedieas eee da tea eee Reread ara ne eal 76.10 | 74.37] 64.71 50. 36 Al2O3 12.95 | 13.34] 16.43 13. 26 Fe203 65 92 1.83 6.30 FeO. 09 21 3.84 9. 34 MgO 14 27 2.97 5. 55 CaO. 12 50 - 08 7.85 Naa) oss: sith saceecimdsisinicigecienins teeming acum tates ade sumnen 2. 36 2. 50 ll 2.11 eee meen enc oar cop SB) a) Se) Ee OP BA ME. fogs ecdeme ce eee NaN eee Rieke wes Ries HER Rhea eeRKaR tee . * . . T120 above 110°. eoscisinecibis ss 2 nieieaarebreieieeisto ie minis 48 44 2.79 1.55 id = 07 07 ate 1.77 02 01 02 20 trace | trace | trace trace 99.65 | 99.45 | 99.44 99. 59 Ba, Sr, Cl, F, 8S, SO3 not looked for. The following rocks, with one exception, are described by Clements in his portion of Mon. XXXVI: E. Mica diorite, sec. 28, T. 42 N., R. 32 W., southeast of Crystal Falls. Shoshonose. Contains plagioclase (andesine), orthoclase, quartz, biotite, hornblende, and titanifer- ous magnetite. Analysis by Stokes, record No. 1721. F. Hornblende gabbro, sec. 29, T. 42 N., R. 31 W., west bank Michigamme River, east of Crystal Falls. Hessose. Contains labradorite, hornblende, and iron oxide, with subordinate pyroxene, biotite, and orthoclase. Analysis by George Steiger, record No. 1712. G. Bronzite norite, same locality as F. Auvergnose. Contains bronzite, horn- blende, and labradorite. Analysis by Steiger, record No. 1712. H. Wehrlite, sec. 29, T. 42 N., R. 31 W., on Michigamme River, east of Crystal Falls. Rossweinose. Contains hornblende, pyroxene, olivine, biotite, and iron oxide. Analysis by Stokes, record No. 1721. IGNEOUS AND CRYSTALLINE ROCKS. 47 I. Picrite porphyry, sec. 27, T. 44 N., R. 32 W., northwest of Mansfield. Principal minerals serpentine, amphibole, chlorite, ilmenite, all but the last being secondary. Analysis by Stokes, record No. 1721, Ris Oi emcees H20 at 110°... Ba, Sr, Cl, F, S, SO3 not looked for. J. Pre-Cambrian nonporphyritic metabasalt, from the Hemlock formation. Beer- bachose. Contains plagioclase, light-green hornblende, epidote-zoisite, chlorite, calcite, muscovite, apatite, sphene, quartz, pyrite, and magnetite. K. Porphyritic metabasalt, Hemlock formation. Same minerals as in J, with feld- spar phenocrysts. L. Porphyritic metabasalt, like K. SR. 5 of monzonase. M. Metadolerite, large dike in T. 43 N., R. 31 W., east of Mansfield. Auvergnose. Petrographic data furnished by C. R. Van Hise. Contains uralite, labradorite, and ilmenite. Analyses J, K, and L by H. N. Stokes, record No. 1617. Analysis M by George Steiger, record No. 1814. N. Adinole, sec. 8, T. 43 N., R. 31 W., near Mansfield. Contains actinolite, albite, quartz, some chlorite, and epidote. Analysis by George Steiger, record No. 1709. O. Spilosite. Contains quartz, feldspar, chlorite, epidote, and a little biotite. - 48 ANALYSES OF ROCKS AND MINERALS, 1880-1908. P. Spilosite. Contains quartz, feldspar, actinolite, and epidote. Analyses O and P by H. N. Stokes, record No. 1617. These three rocks are contact derivatives of the Mansfield clay slate, q. v. 3. KEWEENAW POINT, MICHIGAN. Analyses made by G. Steiger for A. N. Winchell, who has published them in Jour. Geology, vol. 16, p. 772, but without detailed description of the rocks. A. Olivine diabase, Greenstone Cliff: Auvergnose. B. ‘“‘Ashbed” diabase, bed 65, Eagle River section. Camptonose. Ae B BOG: sias stessteneteredacenecies seramiere arias mtlsinrciahrcicinaninina atelsislstaelal oa Slopetnce Rates Moana aemeat, 47.69 50. 07 eT OBS ster 2 cisrecere taislenarssataorsrten. ts sist akarerei ese riancioe reset ele Zioiare rp ialacenefaIeRnoTuaS eee gee jon ae 16. 02 12. 63 C9 OS scenes eewestiep ciniotencla ats. wwliry-varere nares wreallwe avetstw alias wie eteinfe eeetsya len ixiate eleereeinEeen cs 2.41 3.84 BOO). octrauesieoeacenesctent oy a ENT SOE eee ERing REE ERTS eRoME MERE MEMES 8.70 10. 30 M2 Oe sentence a moter any cece innes asad AEDS PE EMR CHEN ER cements 8.31 5. 23 CaO erase Sh Ret a Mit BS cA agit mingles wine RS Um aRtoEINS 10. 54 6. 55 SINS ON is cee Aha re ta a cetacean ecru baited nan dhe t4cle peel dysreve ested 2.44 3. 53 ahaa ease AON dap ela lags setae ian aE ho ghgeteregeach joie sks] snnlestteoropsTatelateiae Raa oral -| mone 1.90 FU OA MOS ae cre cchessncasyetussicieee seserasiel heya otc Sees vashi2 0s sicr5 ys lay SaaS Scareuful acho aie tied Sea s «44 . 86 EMO ADOve MOS... st8 ato teh thdwicunsaspiasae sa odabaeae akead nace SS eMeneweniers -| 2.04 1.96 NAD) 9 ec cs caps vaarcecnarstn bene ese beae Gaerne aoe oman dmewemne Me ee meemiaeeme ae memeereus 5 1.38 2. 50 Pg casa c3ie are wistrverascetaxererar cab eater bie ee tereranavensin (nies evaimca s winoiara tiaras miaraterstevern ata araictayenanens 06 22 MNO sass cemiciecessaticeniemn aie 2 > niece ate tiansisletinarases mths erciamaaraadanctancias we aeivalermersienatate +26 42 BO Osan ceaisiaicrepacciaieventinarcianictorte miaversiata are taic tevemietbu asi ate ince a siti grbeiectaebislawiae TERS aN none 02 100.29 | 100.03 ZrOo, CO», 8, SOs, and SrO absent. 4. MENOMINEE RIVER. STURGEON FALLS GABBRO. From Sturgeon Falls, Menominee River, sec. 27, T. 39 N., R. 29 W., Michigan. Described by Williams, Bull. 62, p. 67. A. Saussurite gabbro. Awvergnose. Contains plagioclase, almost wholly altered to saussurite, diallage, hornblende, and ilmenite, with quartz, calcite, and chlorite as alteration products. P. R. C. 1755. B. The same, altered and somewhat schistose. Feldspar much altered into calcite, with secondary quartz and sericite; pyroxene and hornblende changed to chlorite. Leucoxene common. IGNEOUS AND CRYSTALLINE ROCKS. 49 C. Light-gray, silvery schist, derived from gabbro. Contains chlorite, calcite, and a little quartz, with remnants of feldspar and some leucoxene. Analyses by R. B. Riggs, record Nos. 389, 390, 391. Material dried at 105° TiO, undetermined. 100. 27 | 100. 28 99. 62 LOWER QUINNESEC FALLS, MENOMINEE RIVER. Described py Williams, Bull. 62, pp. 89, 91. A. Gabbro-diorite, shore below falls, Wisconsin side. Auvergnose. Contains saussurite, hornblende, and ilmenite. Some calcite in the saussurite. Hornblende partly altered to chlorite, and ilmenite to leucoxene. B. The same, schistose-form. Contains less saussurite. Hornblende and ilmenite completely altered into chlorite and leucoxene. Calcite present, and also porphyritic feldspar. C. Silvery schist, adjoining B, and derived from gabbro. Resembles B in general, without the feldspar crystals. Calcite and sericite are present, and rutile in place of leucoxene. D. Dark massive greenstone. Contains hornblende, chlorite, epidote, quartz, leucoxene, with some ilmenite and traces of original feldspar. E. Dark schistose greenstone, forming a band in D. Chlorite entirely replaces hornblende, and rutile replaces leucoxene. Some feldspar, quartz, and calcite. Analyses by R. B. Riggs, record Nos. 384, 385, 386, 387, 388. Material dried at 105°. 5. 92 6. 28 2.14 1.96 2.59 oe 35 34 +56 5.05 3. 82 3.99 4.99 1.82 8. 32 08 5. 38 99.95 | 99.73 | 100.57 | 100.39 = UPPER QUINNESEC FALLS, MENOMINEE RIVER. Described by Williams, Bull. 62, pp. 104, 113, 114, 121. A. Light greenstone. Auvergnose. Contains hornblende, feldspar much altered to saussurite, ilmenite with leucoxene border, and some secondary quartz. B. Mica diorite porphyry. J. 5.3.4. Mainly andesitic feldspar and biotite, with apatite, zircon, sphene, and some calcite. C. Biotite gneiss, Michigan side. Contains biotite, soda orthoclase, and quartz. Sphene common, zircon and apatite present. 50 ANALYSES OF ROCKS AND MINERALS, 1880-1908. D. Schistose quartz porphyry. Toscanose. Contains quartz, feldspar, sericite, some chlorite, anatase, and tourmaline, with zircon and apatite sparingly. A, B, and D are from the Wisconsin side of the river. = Analyses by R. B. Riggs, record Nos. 392, 393, 394, 395. Material dried at 105°. SCHIST FROM THE ARAGON IRON MINE. Described by Bayley in Mon. XLVI, p. 122. Consists of quartz and micaceous minerals, either talc or kaolin and serpentine. Some limonite is present. Analysis by George Steiger, record No. 1835. FgOAbOVO110" 3. o cist cine iawesenececeeen 7.66 5. PENOKEE-GOGEBIC REGION. Rocks mostly described by Van Hise in Mon. XIX. Analyses A to G by T. M., Chatard, record Nos. 991, 992, 993, 994, 995. A. Diabase, near southeast corner of sec. 18, T. 47 N., R. 46 W., Michigan. Auverg- nose. Contains plagioclase, augite, magnetite, apatite, and olivine, with some ilmenite and leucoxene. P. R. C. 1001. B. Same dike as A, partly altered. The pyroxene is altered to amphibole, and the latter partly to biotite. Buiotite has also been derived from feldspar. P. R. C. 1000. C. Feldspar separated from A. D. Altered diabase, Aurora mine, NE. { SW. sec. 23, T. 47 N., R. 47 W., Michigan. P. R. C. 1002. 100.12 | 100.15 | 100.24 | 100.85 IGNEOUS AND CRYSTALLINE ROCKS. 51 E. Feldspar separated from gabbro, sec. 14, T. 44 N., R. 4 W., Wisconsin. F, G. Feldspars separated from olivine diabase, NE. } sec. 13, T. 45 N., R. 1 W., Wisconsin, P. R. C. 1003. E. F, G. The following analyses, by W. F. Hillebrand, of separations from the gabbro of Ashland County, Wis., were made for the late R. D. Irving, but were never published by him: H. Magnetite, record No. 687. Partial analysis. I. Feldspar, record No. 688. J. Diallage, record No. 686. For convenience I also include here, although it is decidedly out of classification— K. Graywacke, Hurley, Wis. Described by Bayley in Bull. 150, p. 84. Analysis by H. N. Stokes, record No. 1314. Contains quartz, feldspars, iron oxides, and probably kaolin. In the cement are chlorite, quartz, magnetite, pyrite, rutile, occa- sionally biotite, and either muscovite or kaolin. P. R. C. 20. 89.46 | 100.14 | 100.41 | 100.18 6. PIGEON POINT, MINNESOTA. Described by Bayley in Bull. 109. Also partly in Am. Jour. Sci., 3d ser., vol. 37, p. 54. A and B are also described in Bull. 150, p. 274. A. Olivine diabase. Hessose. Contains labradorite, olivine, pyroxene, apatite, and magnetite. Analysis by W. F. Hillebrand, record No. 496. P. R. C. 107. B. Diallageseparated from diabase. Partial analysis by R. B. Riggs, record No. 607. C. Rock lying between the diabase and the adjacent red porphyry. Adamellose. Contains red feldspar, quartz, hornblende, chlorite, magnetite, apatite, and rutile. Analysis by W. F. Hillebrand, record No. 500. P. R. ©. 1018. 52 ANALYSES OF ROCKS AND MINERALS, 1880-1908. D. Red soda granite. Liparose. Contains feldspar, quartz, chlorite, some mus- covite, rutile, leucoxene, hematite, and apatite, with sometimes secondary calcite. Granular variety. Analysis by W. F. Hillebrand, record No. 495. Dried at 110°. E. Same as D, porphyritic variety. Toscanose. Called by Bayley a quartz kerato- phyre. Analysis by Hillebrand, record No. 497. F. Similar red porphyry, Little Brick Island, Lake Superior, near Pigeon Point. Liparose. Consists chiefly of feldspar and quartz, with augite occasionally present. Analysis by lL. G. Eakins, record No. 1059. G. Red feldspar, anorthoclase, separated from D. Contains hematite inclusions. Analysis by J. E. Whitfield, record No. 521. Dried at 104°. H. Dark vitreous quartzite. Contains quartz, a little red feldspar, some chlorite, some green mica, a few scales of biotite, and grains of magnetite. P.R.C. 1007. I. Lighter interbedded quartzite. Feldspar in it much altered. P. R. C. 1004. J. Epidotic quartzite. P. R. C. 1023. K. Unaltered quartzite. P.R.C.1006. Analyses by R. B. Riggs, record Nos, 569, 571, 572, 575. Material dried at 105°. IGNEOUS AND CRYSTALLINE ROCKS. 538 Ba and Sr not looked for. L. Altered quartzite. Contains more fibrous chlorite, some sericite, a little kaolin and biotite, grains of magnetite, earthy matter, and sometimes a little calcite. Analy- sis by R. B. Riggs, record No. 570. P. R. C. 1009. M. Mottled quartzite. Analysis by Riggs, record No. 573. P.R. C. 1021. N. Purplish slate, containing many small crystals of red feldspar and scales of mica. Analyses by J. E. Whitfield, record No. 520. P. R. (. 1024. O. Very slightly altered slate. Analysis by Riggs, record No. 576. P. R. ©. 1011. Material for analysis dried at 104°-105° Ba and Sr not looked for. P. Red granitic rock resembling D, but with more dark spots, found in contact with the purplish slate, N. Liparose. Consists mainly of red feldspar, quartz, and chlorite. Analysis by J. E. Whitfield, record No. 519. Dried at 104°. P. R. ©. 1014. Q. Groundmass of red mottled quartzite. Analysis by W. F. Hillebrand, record No. 499. P. R. C. 1022. R. Green mottlings from Q. Mostly quartz and sericite. Analysis by Hillebrand, record No. 498. §. Another sample of the green mottlings, selected with especial care. Analysis by L. G. Eakins, record No. 1058. T. Brilliantly red vitreous quartzite. Analysis by R. B. Riggs, record No, 574. Dried at 105° =P. R. Cc; 1008. 15619—Bull. 419—10——5 54 ANALYSES OF ROCKS AND MINERALS, 1880-1908. a] © a n 4 x Pr peonn ESLSBIRIS a ad wo a - 30 100. 48 | 100.08 | 100.00 2 Determined by difference. 7. MESABI DISTRICT, MINNESOTA. The following rocks, described by Leith in Mon. XLIII, do not fall legitimately within this section of the present bulletin. There seems, however, to be no other convenient place for them, and so the niceties of classification have been ignored for reasons of expediency. A. Greenalite rock, test pit, Cincinnati mine. Contains green and brown trans- parent granules, with opaque brown to black ones, ina matrix of chert. P. R. C. 1668. B. Greenalite rock, same locality as A. Contains greenish-yellow granules, slightly altered to amphibole in a matrix of amphibole with subordinate chert. P. R. C. 1669. C. Greenalite rock, near W. quarter post, sec. 35, T. 59 N., R. 15 W. Resembles A. P.R. OC. 1670. D. Greenalite rock, near SE. corner of sec. 22, T. 59 N., R. 15 W. Contains yel- lowish-brown, transparent, and dark-brown to black and opaque granules in a matrix which is mainly amphibole, possibly actinolite. All four rocks contain oxides of iron, either limonite or magnetite. P. R. C. 1671. Analyses by George Steiger, record Nos. 1931 and 1992. In three of the rocks the portions soluble and insoluble in hydrochloric acid were analyzed separately. ‘Avy B. Cc. Insoluble.| Soluble. |Insoluble.| Soluble. |Insoluble.| Soluble. 61 BIOS scccceacagces upesorereentees 36. 50 19. 30 13.01 33. 11 48. 45 13.45 | . 50.96 . - 56 . Be103 says saigneed 2: os sEeeeee ese - 76 13. 83 | 2. 60 6. 44 -64 15.00 5.01 H20 at 105°. P205 C (organic) Insoluble. os a S eo oo a ah ee oe QISP aw HD ASOIMON gets FBO Or Ordo tS n ow a IGNEOUS AND CRYSTALLINE ROCKS. 67 E. Augite andesite, Dike Mountain. Shoshonose. Contains augite, plagioclase, serpentinized olivine, magnetite, and apatite. F. Trachyte andesite, Dike Mountain. Akerose. Contains plagioclase, ortho- clase, chlorite, apatite, and magnetite. Very little augite. G. Biotite trachyte, Dike Mountain. Nordmarkose. Contains plagioclase, ortho- clase, biotite, magnetite, and chlorite. H. Biotite trachyte, Dike Mountain. Pulaskose. Contains orthoclase, plagioclase, biotite, and magnetite. E F G. I SiO gies crs cnteeenpss car ekieimsaiee Bs aomBicduiihe vs 18 Rapchationts ome beeen eases ce wl 51.17 | 52.47 | 63.24 57.73 AgO9 - crsinsiaeivaivar nsiccreiie sacecieccle 16.14 | 18.23 | 17.98 18.93 Bes O gs. ssscronreaicinide sacaetecicon oh Getuilehisins od dasebaneda exiosneisaising. tee mevsine 4.11 3.31 2.67 1.97 FeO. 4,48 3.85 85 1.92 MgO 4.82 2.85 63 91 CaO 7.72 4. 56 93 2.78 Kk20 FigO sat T10P. os cose avrnct tye ace Gad ob. ene nude boo Ge anemia escapee 63 -68 +37 22 HaO above 110°... 2... 2.2.1... eee eee cence eee eee e eee e ees 2.24 2.03 -80 2.93 Odissce keine seen weeaess PeaeRaTES 78 Lae Esscveseeeterers Sree RSE AAS CONN 1.01 97 38 33 ie, a ila nata rae ayaa caskane aga Sona aeea CSc Rta MeLE SA ARREST 48 64 22 25 none 02 | trace trace trace | trace | none trace 04 03 01 01 01 | trace | none | trace? a senesex 21 “5 04 fess ats Die zicaeiays seis Pucvabahsy ic: iz, ekcasheteadan Gastonia’ eile See a SE AOS 10 i 03 09 se esuasen 20 23 325 16 it Jgateated trace | trace | trace trace eh edmden none 1.01 none 26 s .piawtacieid ssieh nisin DOO ceGasns Ese aR ERMTET PEVeCdamalls wobansedos 05 04 | trace 02 4. ABSAROKITE-SHOSHONITE-BANAKITE SERIES. Rocks from the Yellowstone Park and the Absaroka Range, described in Mon. XXXII, pt. 2, and also by Iddings in Jour. Geology, vol. 3, pp. 938, 943, 947. The rock A, from Ishawooa Canyon, is also described by Hague in Am. Jour. Sci., 3d ser., vol. 38, p. 46. A. Leucite absarokite, Ishawooa Canyon, Wyoming. Camptonose. Bowlder. Contains olivine and augite in a groundmass of orthoclase and leucite. Accessory minerals, magnetite, apatite, and a few flakes of brown mica. Analysis by J. E. Whitfield, record No. 1057. Material dried at 104°. B. Absarokite dike, head of Lamar River. Lamarose. Contains olivine and augite in a groundmass of orthoclase and plagioclase, with accessory magnetite, biotite, and ilmenite. C. Absarokite dike, south of Clark Fork. Absarokose. Contains augite, quartz, biotite, magnetite, orthoclase, plagioclase, and sometimes analcite. D. Absarokite lava flow, head of Raven Creek. Acntallenose. Contains olivine, augite, orthoclase, labradorite, magnetite, apatite, and a little serpentine. E. Absarokite dike, divide east of Cache Creek. Absarokose. Contains orthoclase, plagioclase, augite, biotite, magnetite, serpentine, and occasional quartz. Analyses B, C, D, and E by L. G. Eakins, record Nos. 1086, 1365. 68 ANALYSES OF ROCKS AND MINERALS, 1880-1908. F. Shoshonite lava sheet, Lamar River, south of Bison Peak. Shoshonose. Con- tains plagioclase, orthoclase, augite, olivine, magnetite, and serpentine, with amyg- dules of zeolite and calcite. Analysis by Eakins, No. 1086. G. Shoshonite lava sheet, southeast fork of Beaverdam Creek. Shoshonose. Con- tains plagioclase, orthoclase, augite, and serpentinized olivine. H. Leucite (?) shoshonite lava sheet, mountain east of Pyramid Peak. Shoshonose. Contains feldspars, olivine, serpentine, augite, magnetite, brown mica, and impure leucite (?). I. Olivine-free shoshonite dike, northeast of Indian Peak. Shoshonose. Contains augite, plagioclase, biotite, and magnetite. J. Shoshonite lava sheet, Two Ocean Pass. Shoshonose. Contains orthoclase, serpentinized olivine, magnetite, augite, chlorite, biotite, apatite, labradorite. Dried at 104°. Analyses G, H, I by Eakins, Nos. 1371, 1375, 1379. Analysis J by Whitfield, No. 906. F G H. I J. 54. 86 56.05 17. 28 19.70 4.08 3.74 2. 28 2.32 4.19 2.51 5. 42 4.34 3.94 3.29 3.96 4. 44 2.16 1.86 - 69 - 98 48 - 66 19 trace ON | sistas Maio sininne - 06 apeebade -19 99.90 | 100.14 K. Banakite dike, head of Lamar River. Monzonose. Contains augite, serpen- tinized olivine, orthoclase, plagioclase, biotite, magnetite, ilmenite, apatite, and analcite. Adjoins rock B. Analysis by Eakins, No. 1375. L. Banakite dike, Hoodoo Mountain. Monzonose. Like K, but with amygdaloidal zeolites. Analysis by Eakins, No. 1371. M. Banakite dike, Ishawooa Canyon, Wyoming. Monzonose. Like K and L, but more feldspathic. Contains a little serpentine, probably from olivine; also pos- sibly analcite or sodalite. Analysis by Eakins, No. 1086. IGNEOUS AND CRYSTALLINE ROCKS. 69 N. Banakite dike, near head of Stinkingwater River. Monzonose. Like M, but with more serpentine. Analysis by W. H. Melville, record No. 1232. K L | M. N 52.63 | 51.46 52. 33 16.87 | 18.32 18.70 81 83 71 63 - 86 81 10 aly, - 08 Latogiene becom 14 220 [oe wee fe sdveoen 100. 10 | 100.38 100.31 Q. Leucite banakite lava sheet, southeast fork of Beaverdam Creek. Shoshonose. Overlies rock G. Contains olivine, augite, leucite, feldspars, magnetite, apatite, and a little brown mica. Analysis by Eakins, No. 1378. P. Earlier analysis of O, another sample, by J. E. Whitfield, record No. 907. Q. Quartz banakite dike, near head of Stinkingwater River. Monzonose. Con- tains plagioclase, orthoclase, quartz, biotite, magnetite, augite, and a little calcite. Analysis by Melville, No. 1232. R. Quartz banakite dike, near Q. Pulaskose. Contains plagioclase, orthoclase, quartz, biotite, magnetite, augite, chlorite, and serpentine. Analysis by Melville, No. 1232. Oo P Q. R 52.93 | 51.56] 57.29 60 89 19.67 } 21.00 | 18.45 17.14 3.07 5.17 4. 38 3 32 3.50 2.76 1,20 95 2. 88 2. 52 2.08 1.16 4.69 4. 83 3.57 3.58 4. 20 4. 37 4. 43 4.54 KOs: j2-c.20 eae beses 2 aececonnes Mateeiee weet Semacaemetg sere eerie 4, 75 4.13 5. a 5. a Fo AG 1007s 2 .ccreispcsistaeisat wesrupecee et f 3) 120 above 100° } 273k 227) ool) be TiO. 72 65 se! 49 P20s. 59 69 46 27 MnO. 15 | trace | trace 09 IN Oi cc seas. rece oretegoises nt eeiciecectoasicas mis aereamestn anaes. Raa G ak Faeo OR ates. g Selos gacema petelecisy ~12 19 BGO cer ctes eeerietactinee aoe autos ee mennmistan avamiemanks ) Oe eata reese kane QUA ee tok seed evierGrets| neers Tyg espace & secure sag tae eweieeepan yates nei toueciotage bt aatnceaieaee oleg arm IS Sal SIONS ABH ena Sed akcaiede BO gies a cscescinisicgeeicicn eine > la es See SAM AR eRewinnenine emi dem Ue RGaS ege/ ie eles Wd Wiss sch mrd|ae secnctel CY doe seouaterais ie dezon cusgeteia a: 2s cicikaiuiasia Bs Dis Aeie Poes Sie Ser eames is ale aottel de eroeeeteis tes lcs sian ETACE: |p. csiercieracs | eieemeense 100.09 | 100.29 | 100 31 99. 94 S. Absarokite, Two Ocean Pass, Kentallenose. Contains augite, olivine, ortho- clase, magnetite, serpentine, little biotite, apatite, and an isotropic substance, prob- ably glass. Analysis by J. E. Whitfield, record No. 906. T. Shoshonite, Beaverdam Creek. Shoshonose. Analysis by Whitfield, No. 907. Probably the rock already represented by analysis G. U. Shoshonite, northeast spur of Sepulchre Mountain. Shoshonose. Contains augite and serpentinized olivine, in a groundmass of plagioclase, orthoclase, augite, magnetite, and apatite. Analysis by Whitfield, No. 908. V. Shoshonite, Baldy Mountain, Bear Gulch, Montana. Shoshonose. Contains hypersthene, augite, olivine, plagioclase, orthoclase, and magnetite. Analysis by Whitfield, No. 909. 15619—Bull. 419—10 —6 10 ANALYSES OF ROCKS AND MINERALS, 1880—1908. 5. MISCELLANEOUS ROCKS. First group: Collected and investigated by Arnold Hague and J. P. Iddings. A. Black obsidian, Obsidian Cliff. Liparose. Described by Iddings, 7th Ann. Contains microlites of augite and magnetite, with traces of quartz and feldspar. Analysis by J. E. Whitfield, record No. 224. B. Red obsidian, Obsidian Cliff. Alaskose. Described by Iddings, 7th Ann. Like A, with ferric oxide replacing magnetite. Analysis by Whitfield, No. 223. C. Obsidian, east of Willow Park. Lassenose. Black and opaque. Described by Iddings, Bull. Philos. Soc. Washington, vol. 12, p. 204. Analysis by Whitfield, No. 222. , D. Lithoidite, Obsidian Cliff. Lassenose. Described by Iddings, Bull. 150, p. 153. Contains quartz and sanidine, with a little magnetite and augite. Analysis by Whitfield, No. 425. P. R. C. 62. E. Rhyolite, Upper Geyser Basin. Leparose. See Iddings, Bull. Philos. Soc. Washington, vol. 12, p. 204. Analysis by F. A. Gooch, record No. 114. F. Rhyolite, Tower Creek. Toscanose. See Iddings, Bull. Philos. Soc. Washing- ton, vol. 12, p. 204. Analysis by Gooch, No. 115. G. Rhyolite, “Great Paint Pots.’’ Liparose. Analysis by Gooch, No. 113. H. Rhyolite, ‘Elephants Back.’’ Porphyritic obsidian. Tchamose. Analysis by Whitfield, No. 423. Reported by Iddings as containing quartz, sanidine, and a little augite and magnetite, in a glassy, microlitic groundmass. I. Rhyolite, Mount Sheridan. Tehamose. Composition reported by Iddings as quartz and sanidine, with a little magnetite and augite. Analysis by Whitfield, No. 426, IGNEOUS AND CRYSTALLINE ROCKS. 71 J. Sanidine quartz rhyolite, Sheridan volcano. Analysis by G. Steiger, record No. 2154. K. Rhyolite, Madison Plateau. Like I. Near alaskose. Analysis by Whitfield, No, 427. L. Trachytic rhyolite, Elk Creek. Lassenose. Analysis by Whitfield, No. 428. Reported by Iddings as containing sanidine, labradorite, and little biotite, in a groundmass of quartz and alkali feldspar. M. Trachytic rhyolite tuff, Two Ocean Pass. Analysis by Whitfield, No. 906. Reported by Iddings as containing sanidine, labradorite, biotite, magnetite, and augite, in a somewhat altered, glassy groundmass. Also contains fragments of andesite. N. Glassy trachyte, approaching rhyolite, Sunset Peak, Bear Gulch. Toscanose. Contains phenocrysts of sanidine, plagioclase, and biotite. See Iddings, Bull. Philos. Soc. Washington, vol. 12, p. 205; also Mon. XXXII, pt.2. Analysis by L. G. Eakins, record No. 1378. O. Altered rhyolite, ‘‘Iron Pot,’’ Lower Basin. Collected by W.H. Weed. Analy- sis by Whitfield, No. 546. P. Dacite porphyry, Echo Peak. Near alaskose. Q. SameasO, Mount Holmes. w a ea ¢, RIS es Sr cy oo SSRSSRE D. Gray porphyry, Johnson Gulch, near Leadville. Yellowstonose. Slightly altered. Contains orthoclase, plagioclase, biotite, and quartz, with decomposition products probably derived from original hornblende. Sp. gr., 2.736, 16°. Analysis by Hillebrand. IGNEOUS AND CRYSTALLINE ROCKS. 109 E. Pink orthoclase crystals from D. Analysis by Hillebrand. F. Hornblendic porphyrite, lower Buckskin Gulch. Andose. Contains plagioclase, orthoclase, quartz, hornblende, biotite, magnetite, apatite, and zircon, with a little secondary calciteand chlorite. Sp. gr. 2.768,16° Analysis by Hillebrand. P.R.C. 89 and 506. G. Biotite porphyrite, dike in gneiss in the North Mosquito amphitheater. Tonalose. Composition like F, but with no hornblende, much biotite, and some pyrite. Sp. gr., 2.740, 16°. Analysisby Hillebrand. P.R. . 507. 100.11 | 99.16 | 100.73 | 100.61 H. Rhyolite (nevadite), from Chalk Mountain. Liparose. Mainly quartz and feldspar, the latter being sanidine and plagioclase. A little biotite, magnetite, apatite, and zircon are present. Analysis by Hillebrand. P.R. C. 64, 512, and 1289. I. Sanidine from H. Analysis by Hillebrand. P.R.C 64. 6. TENMILE DISTRICT. Rocks described by Crossin 14th Ann., p.165. Analyses madein the Denver labo- ratory—A and C by W. F. Hillebrand, B by L. G. Eakins. A. Quartz-hornblende-mica porphyrite, Gold Hill. Yellowstonose. Contains plagioclase, hornblende, biotite, and quartz in a groundmass of quartz, orthoclase, and alittle plagioclase. P.R.C. 510. B. Quartz porphyrite, Sugar Loaf. Toscanose. Contains plagioclase, biotite, and quartz, in a groundmass of quartz and orthoclase. P. R. (. 509. C. Quartz porphyrite, Chicago Mountain. Lassenose. Contains plagioclase, ortho- clase, biotite, and quartz. P.R. (. 508. 110 ANALYSES OF ROCKS AND MINERALS, 1880-1908. The following rocks were also analyzed in the Denver laboratory. Petrographic data furnished by Whitman Cross. A. Granite porphyry, McNulty Gulch. Toscanose. Contains phenocrysts of orthoclase, oligoclase, andesine, quartz, biotite, and altered hornblende, in a ground- mass of quartz, orthoclase, and magnetite. Accessory sphene, allanite, apatite, and zircon, and a little secondary chlorite are also present. Analysis by W. F. Hillebrand. P.R. C. 586. B. Granite porphyry, Jefferson tunnel. Toscanose. Contains orthoclase, oligo- clase, quartz, and biotite, in a groundmass of mainly quartz and orthoclase; also accessory magnetite, apatite, zircon, and allanite. Chlorite appears as a decompo- sition product of biotite, and calcite and magnetite are present in small amounts. Analysis by Hillebrand. C. Sameas B. Toscanose. Analysis by L. G. Eakins. P. R. C. 583. D. Diorite porphyry, Copper Mountain. Yellowstonose. Contains oligoclase, horn- blende, and biotite, in a groundmass of quartz, orthoclase, plagioclase, and mag- netite; also accessory zircon, sphene, and apatite, and a little secondary chlorite and epidote. Analysis by Eakins. P. R. (. 585. E. Diorite porphyry, McNulty type. Lassenose. Contains oligoclase, andesine, hornblende, biotite, and magnetite, in a groundmass of orthoclase, plagioclase, quartz, magnetite, apatite, allanite, and sphene; also secondary chlorite, epidote, and calcite. Analysis by Eakins. P. R. C. 584. 100. 32 100. 26 100.15 | 100. 40 100. 32 BOs Bt sit aaa kean dae saaeauaas cecmaaes 2.640, 27° | 2.672, 21° | 2.666, 26° |........ 2. 689, 16. 5° IGNEOUS AND CRYSTALLINE ROCKS. 111 7. ELK MOUNTAINS. Analyses made by L. G. Eakins in the Denver laboratory. Petrographic data supplied by Whitman Cross. A. Rhyolite, East Mountain, Crested Butte district. Alsbachose. Phenocrysts of orthoclase, oligoclase, quartz, and biotite, in a microspherulitic and cryptocrystalline groundmass. P.R. C. 514. B. Rhyolite, Round Mountain, Crested Butte district. Toscanose. Small pheno- crysts of quartz. sanidine, biotite, and oligoclase, in a groundmass of quartz and orthoclase. P. R. C. 513. C. Diorite, Brush Creek, Gunnison County. Tonalose. Contains several varieties of plagioclase, with orthoclase, quartz, hornblende, biotite, augite, sphene, apatite, and magnetite. P. R. C. 93. 100.07 | 100.20 100. 33 Seg receray ctr Rearend Sea acto note ek nederdel ketch oa a 2.38, 17° | 2.59, 18° aber 8. WEST ELK MOUNTAINS. Rocks described by Cross in 14th Ann., p. 165. A. Hornblende-mica porphyrite, Cliff Creek. Adamellose. Contains plagioclase, hornblende, and biotite, in a groundmass of quartz, feldspar, and mica. Analysis by W. F. Hillebrand, record No. 1429. B. Porphyrite, Storm Ridge. Yellowstonose. Contains plagioclase, biotite, hyper- sthene, hornblende, and augite, in a groundmass of quartz and orthoclase. Analysis by L. G. Eakins, record No. 1238. P.R.C. 517. C. Porphyrite-diorite, Mount Marcellina. Yellowstonose. Contains plagioclase, hornblende, and a little biotite, in a groundmass of quartz.and orthoclase. Analysis by T. M. Chatard, record No. 1238. P. R. C. 516. D. Quartz porphyrite, Mount Carbon. Amiatose. Contains plagioclase, ortho- clase, biotite, hornblende, augite, and quartz. Analysis by Chatard, record No. 1238. P.R. C. 518. E. Quartz porphyrite, Crested Butte. Lassenose. Contains plagioclase, orthoclase, hornblende, biotite, quartz, and a little augite. Analysis made by Eakins in the Denver laboratory. P. R. C. 515. a 112 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 9, LA PLATA MOUNTAINS. Rocks described by Whitman Cross in Folio 60. A. Monzonitic facies of diorite mass. -Akerose. Contains augite, hornblende, plagioclase, and orthoclase in large amount, with biotite, quartz, sphene, apatite, and magnetite as subordinate constituents. Also secondary chlorite, muscovite, and calcite. Analysis by W. F. Hillebrand, record No. 1640. Sp. gr., 2.79, 21°. De- scribed by Cross in 21st Ann., pt. 2. P. R. C. 1284. B. Diorite porphyry, Deadwood Gulch. Akerose. Contains phenocrysts of horn- blende, plagioclase, occasional quartz, sphene, apatite, and magnetite in a groundmass of orthoclase, plagioclase, and quartz. Also secondary epidote, chlorite, and calcite. Analysis by Hillebrand, record No. 1636. Sp. gr., 2.677, 24°. A trace of sulphur is present. Described by Cross in 21st Ann., pt. 2. P. R. 0. 1283." C. Augite syenite, between Tirbircio and Schurman gulches. Monzonose. Con- tains much alkali feldspar, some oligoclase, augite, biotite, and hornblende, with a little titanite, magnetite, and apatite. Analysis by H. N. Stokes, record No. 1764. Sp. er., 2.704, 25° ~P. R. C. 1286. D. Augitic monzonite, Babcock Peak. Andose, Contains orthoclase and plagio- clase in about equal amounts, with augite and hornblende, and a little quartz, titanite, magnetite, and apatite. Analysis by Stokes, record No. 1764. Sp. gr., 2.767, 26°. Described by Cross in 21st Ann., pt. 2. P. R. C. 1285. E. Porphyritic lamprophyre, allied to camptonite, Snowstorm Peak. Kental- lenose. Contains numerous phenocrysts of green hornblende, augite, and plagioclase, in a groundmass of plagioclase, orthoclase, augite, magnetite, and apatite. Some secondary calcite. Analysis by Hillebrand, record No. 1640. Sp. gr., 2.906, 21°. P. R. C. 1287. f. Basic dike rock, Indian Trail Ridge, La Plata quadrangle. Camptonose. Contains phenocrysts of green hornblende and colorless diopside in a subordinate groundmass of plagioclase, orthoclase (?), augite, magnetite, and apatite. Much secondary calcite and some serpentine. Analysis by W. F. Hillebrand, record No. 1640. Sp. gr., 2.912, 19.5°. P. R. C. 1288. A B C. D. E F SHO gs anaiea aemrereeretanieaaiies erncies oes eetende aieiememee ier 55.53 | 60.44 | 59.79 | 57.42 | 47.25 43. 98 AN Og e.c ac retnecearrenaiisha coe eae een ane se oeeneee 16.78 | 16.65] 17.25} 18.48} 15.14 13. 30 PCO a oisscizdiardcrrqumiavewan sincinercemn cinch cineae ccleeareds 4.06 2.31 3. 60 3.74 5.05 3. 67 FeO. 3. 35 3.09 1.59 2.10 4.95 6. 92 MgO 3.00 2.18 1.24 171 6. 87 7.03 CaO. 6. 96 4,22 3.77 6.84 9. 98 10. 66 Naz2O 4.31 5.18 5.04 4.52 39 2.15 FiO Bt MOS. coc: cnemeccnncauunecsocasiace camer! 09) 36] 219 708 Bat ND OM OULD Petal cain Seca sg exces lesched apr oyshei ve Sab larseareeecnnode IGNEOUS AND CRYSTALLINE ROCKS, 1138 10. SILVERTON QUADRANGLE. Rocks A, B, C, D described by Whitman Cross in Folio 120. Analyses by W. F. Hillebrand, record Nos. 2024, 2042, 2045. A. Quartz latite, ridge north of Pole Creek. Amiatose near yellowstonose. Contains phenocrysts of andesine, hornblende, and a little biotite, in a predominant groundmass of orthoclase, plagioclase, quartz, and a little augite, biotite, and magnetite. P.R.C. 1353. B. Quartz latite, bench south of Greenhalgh Mountain. Toscanose. Contains phenocrysts of oligoclase-andesine and biotite in a groundmass of orthoclase, quartz, and rare accessories. P. R. C. 1354. C. Pyroxene andesite, ridge west from Edith Mountain. Tonalose. Contains phenocrysts of labradorite, augite, hypersthene, biotite, and magnetite, in a ground- mass which is largely glass, with feldspar microlites and ferritic particles. P. R. C. 1355. D. Pyroxene andesite, Dolly Varden mine, Henson Creek. Harzose. Contains phenocrysts of labradorite, hypersthene, augite, and magnetite, in a groundmass of plagioclase, orthoclase, quartz, augite, magnetite, etc. P. R. C. 1356. COaabsent. Cl, F, not looked for. Rocks E to I described by F. L. Ransome in Bull. 182. E. Altered andesitic breccia, White Cloud mine. Contains quartz, kaolin, pyrite, rutile, and some undeterminable minerals. Analysis by George Steiger, record No. 1886. F. Latite, country rock, Polar Star mine, Engineer Mountain. SR. 3 of vaalase. Contains labradorite, orthoclase (?), quartz, diopside, chlorite, calcite, serpentine, kaolin, magnetite, hematite, apatite, rutile, and leucoxene. Mainly feldspar and quartz. G. Altered latite, same locality as P, wall rock of vein. Contains mainly quartz and kaolin, with diaspore, pyrite, sericite, rutile, and apatite. H. Monzonitic porphyry, near Yankee Girl mine. Adamellose. Contains albite, quartz, orthoclase, chlorite, calcite, sericite, iron ores, pyrite, and apatite. I. Altered monzonitic porphyry, near National Belle mine. Contains quartz, kaolin, pyrite, diaspore, sericite, apatite, and rutile. Analyses F to I by H. N. Stokes, record No. 1888. 114 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 5.85 - 43 4.31 31 2.61 -15 3.24 04 3.77 24 4.06 06 - 46 - 50 25 58 1.51 5.39 1.57 4.18 1.10 1.21 -99 1.33 | none 3. 49 none 45 -ol -53 TRACE) hoc cipoac seit tes be ctaetate 7.19 1.56 09} none | trace 03 - 06 12 05 | trace 05 100.32 | 99.40 | 99.73 11. OURAY QUADRANGLE. Rocks described by Ernest Howe in Folio 153. Analyses by G. Steiger, record No. 2200. A. Quartz-biotite latite, near head of middle fork of Cimarron Creek. Contains plagioclase, « little orthoclase, biotite, augite, accessory magnetite, and very little doubtful quartz. B. Quartz-biotite latite, north end of Cow Creek intrusive body, between Wild- horse Creek and the west fork pf Cow Creek. Contains plagioclase, very little ortho- clase, quartz, biotite, and magnetite. C. Quartz-pyroxene latite, west side of ridge between the Middle and East Cim- arron creeks. Contains andesine, hornblende, pyroxene, biotite, and magnetite. D. Quartz monzonite porphyry, Porphyry Basin, Middle Cimarron Creek. Con- tains plagioclase, orthoclase, biotite, hornblende, and magnetite. 5S and SO, absent, IGNEOUS AND CRYSTALLINE ROCKS. 115 12, TELLURIDE QUADRANGLE, Rocks collected by Whitman Cross. All except A described in Folio 57. A. Lamprophyre, allied to camptonite, Black Face. Andose. Consists of a fine | felt of plagioclase, augite, and brown hornblende microlites, with flakes of biotite, and a cryptocrystalline part, which is probably in large degree orthoclase. Some magne- tite and apatite. Analysis by Hillebrand, record No. 1719. Sp. gr., 2.783, 22° P. R. ©. 1282. B. Quartz monzonite, northeast of San Miguel Peak. Toscanose. Contains ortho- clase and plagioclase in about equal amounts, with abundant quartz and much Jess augite, hornblende, biotite, magnetite, and apatite. Analysis by H. N. Stokes, record No. 1764. Sp. gr., 2.720, 34° Described by Cross in 21st Ann., pt. 2. P. R.C, 1279. C. Diorite monzonite, Ophir Needles. Tonalose. Contains abundant labradorite, with augite, hypersthene, biotite, orthoclase, magnetite, apatite, and a very little quartz. Analysis by Stokes, record No. 1764. Sp. gr., 2.860, 33° D. Gabbro porphyry, pass south of Mount Sneffels. Andose. Contains numerous phenocrysts of labradorite or bytownite, in a groundmass of plagioclase, orthoclase (?), augite, hypersthene, biotite, magnetite, and apatite. Analysis by Stokes, record No. 1764. Sp. gr., 2.949, 26.5° P.R. C. 1280. E. Vitrophyre, ridge east‘of Windy Gap. Yellowstonose-lassenose. P. R.C. 1281. Analysis by H. N. Stokes. F. Gabbro, Stony Mountain, Ouray County. Hessose. Analyzed by Eakins in the Denver laboratory. Sp. gr., 2.891, 13.5°. P. R. C. 199. af Bw eo & Ry 47.32 | 64.72 | 52.05 16.71 | 14.18] 17.96 6.92| 1.58] 4.09 5.941 140] 6.33 5.69 | 150) 5.03 851| 2.62| 8.64 2.70} 3.88] 2.99 2.02) 1-82 161 e 6 tod] wselp °9? 99.95 | 100.20 | 100.41 13. MISCELLANEOUS ROCKS. A. Diabase, east of the Sugar Loaf, Boulder County. Hessose. Description fur- nished by Whitman Cross. The rock contains labradorite, orthoclase, augite, and magnetite, with small amounts of hornblende, biotite, apatite, and secondary chlo- rite. Sp. gr., 3.027, 21° P. R.. 166. B. Pyroxene separated from A. Analyses A, B, made by L. G. Eakins in the Denver laboratory. C. Alkali syenite porphyry, Idaho Springs. Pulaskose. Described by S. H. Ball, in P. P. 63. Contains anorthoclase, orthoclase, egirine-augite, garnet, titanite, biotite, apatite, magnetite, and often zircon. Analysis by G. Steiger, record No. 2258. D. Porphyry, Idaho Springs. E. Biotite latite, Idaho Springs. Rocks D, E, received from J. E. Spur, but without description. Analyses by W. _T. Schaller, record No, 2263, 116 F. Granite, Platte Canyon. Alaskose. Described by E. B. Mathews in Bull. 150, ANALYSES OF ROCKS AND MINERALS, 1880-1908. p.172. Contains microcline, quartz, biotite, oligoclase, and fluorite. Apatite, zircon» magnetite, hematite, limonite, epidote, and rutile (?) are sometimes present. Analysis by H. N. Stokes, record No. 1314. A B c Di E F SiO aie ies eteewneteners eaeseecoce sere vemeasaceaeeeees 66. 44 AleO3..-.-.-- 14. 98 Fe203.-..... 1.57 FeO s MgO ® CaO 2.47 Ky H20 at 105°. --- H20 above 105°. G. Rhyolite, east bank of Arkansas River, Nathrop. Liparose. Cross in Proc. Colorado Sci. Soc., vol. 2, p. 69. Contains quartz and sanidine in a groundmass mainly of quartz and alkali feldspar. This rock carries topaz and spes- sartite in its lithophyse. Analysis made by L. G. Eakins in the Denver laboratory. Sp. gr., 2,602, 29° P. R. C. 598. H. Hornblende porphyrite, Hermano Peak, Sierra El Late. Lassenose. Described by Cross in 14th Ann., p. 165. Contains plagioclase, hornblende, rare quartz, and a little biotite. Analysis by W. F. Hillebrand, record No. 1429. I. Hornblende porphyrite, Ute Peak, Sierra El Late. Tonalose. Described by Cross in 14th Ann., p. 165. Contains plagioclase, hornblende, and very little augite, in a groundmass of quartz, orthoclase, and plagioclase. Analysis by Hillebrand, No. 1429. J. Porphyritic augite diorite, Lone Cone, San Miguel Mountains. Tonalose. De- scribed by Cross in 14th Ann., p. 165. Contains plagioclase, augite, hornblende, and biotite, in a groundmass of quartz, orthoclase, and plagioclase. Inclusions of mag- netite and apatite in the augite. Analysis by Hillebrand, No. 1429. Described by G H. I J. Bi ag atiea Wi Maeetinsnetin dad ereweraaedy) peeEnEeRATaNas Cdeadenne 69.89 | 62.65 | 59.42 59. 19 FU Bos checsshie aprrescincpsesiarreted winieie Wn alata aia Sa wee ncbwie siete aechalatoeid x a ata 17.94 | 16.68 | 16.79 18.00 DTI ssa eco hd we ooe Seataid Sra ares apo pvatniadatinnn sts ackc etanassaNG oun signe 39 2.35 3. 238 3.07 FeO. -52 2. 63 3.29 2.32 MgO .14 1. 43 2.24 1.41 . CaO. trace 4. 96 5. 57 6.55 Nae seins 4.21 4,45 4.15 4.01 KO's cic ewes 4. 38 2.75 2. 82 2.74 H20 at 100°.......2...2... 2.07 +27 327 46 HaOPADOve 100 sss. o25t celal cen aecllah Daten semememagrecmin cade 7 - 66 29 1.06 Di aciaaneinias hace hate hela np nated aide aWaad aac aaaawammedasmabanimenn aun ewaveena 42 - 68 . 58 PaO iiiceicccsasercisiers trace 23 35 -29 MnO.......... 23 16 13 -19 DLO adaleansavawsanoningunbendesign se macia wpa amatanaghe se wnemctnievea gabe oasmubak yi -07 +13 Ba Occ sisietiordsratat sicvitre crewtansts weclersind ageRerees Sas eeanets wk Dee Mocowaidemechaivanlauisaiesiens 13 14 -18 DO wamnmaurate teeny aeabanimue ees < PRE weehEs ss baduBadnpnkavndadmavnawancaad trace | trace | trace trace COR. ae a pialaausteisie's Sterstesaecistararets cls inse mvoccrstecgiSinpnsare scatesousroperate nis Bla diotarnsasvea vie wivlojae Leibewmacane [Reames Ab lescaawes 99.77 | 99.93 | 100.38 | 100.18 IGNEOUS AND CRYSTALLINE ROCKS. 117 K. Tinguaite (?), Two Buttes. Laurdalose. Collected by G. K. Gilbert; petro- graphic data supplied by Whitman Cross. Consists chiefly of pale-green augite, horn- blende, apatite, magnetite, and occasional crystals of alkali feldspar, in an obscure, largely isotropic groundmass. Sp. gr., 2.79, 25° P. R. C. 1393. L. Pyroxene from I’. Sp. gr., 3.43, 28°. M. Portion of F soluble in 1:40 nitric acid. N. Syenitic lamprophyre (?), Two Buttes. Prowersose. Collected by Gilbert; described by Cross in Jour. Geol., vol. 14, p. 165. Chief constituents, diopside, alkali feldspar, considerable biotite, magnetite, and olivine. The ferromagnesian minerals predominate. Sp. gr., 2.88, 29°. P. R. C. 1394. O. Pyroxene from I. Sp. gr., 3.45, 25°. P. Portion of I soluble in 1:40 nitric acid. Analyses F to K by W. F. Hillebrand, record No. 1604. trace | rage? carcas satiate oon 100.68 | 100.21 | 33. 06 | 100. 42 | 100.27) 5.81 | Rocks Q to V collected by Whitman Cross, who supplies the petrographic data. Hitherto unpublished, except when otherwise stated. Q. Rhyolitic vitrophyre, near Del Norte, Rio Grande County. Toscanose. Re- ported by Cross as containing phenocrysts of oligoclase, quartz, biotite, and augite in a dark, fresh, glassy groundmass, the latter being predominant. Analysis made by Eakins in the Denver laboratory. Sp. gr., 2.423, 14°. P.R. C. 164. R. Rhyolite, Summit district, Rio Grande County. Toscanose. Large pheno- crysts of sanidine, with smaller ones of oligoclase and biotite, in a groundmass of orthoclase, quartz, oligoclase, biotite, and magnetite. Analysis by Eakins, made in the Denver laboratory. Sp. gr., 2.489, 14° ; 8. Quartz monzonite, Sultan Mountain, San Juan County. to ip) o I cl mo SERVO ATR TSSSS88S8R Cr2O3 and SO; absent. 6. MISCELLANEOUS ROCKS. A. Rhyolite, Thomas Range. Toscanose. Analysis made by L. G. Eakins in the Denver laboratory. Described by Cross in Proc. Colorado Sci. Soc., vol. 2, p. 69. Contains phenocrysts of quartz and sanidine in a groundmass mainly made up of quartz and alkali feldspar. B. Rhyolitic glass or pitchstone, edge of Gold Mountain mining district, 8 miles north of west from Marysvale. Liparose. Identified by Whitman Cross. Sp. gr., 2.25 at 23.5°. Analysis by W. F. Hillebrand, record No. 1833. NEW MEXICO, 1. BASALTS FROM RIO GRANDE CANYON. Described by Iddings, Bull. 66; also in Am. Jour. Sci., 3d ser., vol. 36, p. 220. Contain plagioclase, augite, olivine, and magnetite. A, B, and C contain quartz also; D is quartzless. Analyses by L. G. Eakins, record Nos. 847, 850. All andose. A. Light gray, dense. P. R. C. 548. B. Greenish black, dense. C. Dark red, vesicular. P. R. ©. 549. D. Gray, dense. P. R. C. 547. IGNEOUS AND CRYSTALLINE ROCKS. 123 99. 91 2. MOUNT TAYLOR REGION, Rocks received from J. S. Diller. Analyses by T. M. Chatard, record Nos. 219, 227, 228, 235, 271, 268, and 269. Petrographic details furnished by Diller. A. Lava, canyon on east side of San Mateo Mountain. Kallerudose. B. Andesite, canyon on east side of San Mateo Mountian. Nordmarkose. Contains feldspar and corroded augite, with sometimes olivine, in a groundmass of feldspar and a green ferromagnesian silicate. P. R. C. 1402. C. Quartz latite, canyon on east side of San Mateo Mountain. Lassenose. Shows prominent plagioclase, with augite and biotite. P.R.C. 1403. D. Dacite, 6 miles northeast of Grant’s. Principally plagioclase and biotite, with less epidote, quartz, sphene, and carbonates. P. R. C. 1401. E. Basait, 6 miles northeast of Grant’s. Auvergnose. Contains chiefly plagioclase, augite, and olivine, with much magnetite. P. R. C. 1400. F. Augite from E. G. Feldspar from E. Analysis on three-fourths gram of material. 99.85 | 100.65 3. COLFAX COUNTY. Descriptions supplied by Whitman Cross. Analyses by W. F. Hillebrand, record No. 1719. A. Phonolite, Pleasant Valley. Miaskose. Contains much nephelite, some egirite, alkali feldspar, a scanty dust of magnetite, and a few decomposed grains of noselite or-sodalite. Sp. gr., 2.619, 22°; 40.8 per cent soluble in dilute (1:40) nitric acid, of which soluble portion 43.5 per cent is silica, P.R.C. 1334. 124 ANALYSES OF ROCKS AND MINERALS, 1880—1908. B. Pyroxene andesite, Sierra Grande. Tonalose. Contains augite, less hypers- thene, microliths of plagioclase, apatite, magnetite, and a smoky-brown glassy base. Sp. gr., 2.635, 21° P. R. C. 1335, C. Plagioclase basalt, end of San Rafael flow. Camptonose. Contains plagioclase, atigite, olivine, with much iddingsite, magnetite, and apatite. Sp. gr., 2.970, 21.5°. P. R. C. 1336. D. Nepheline basanite, Ciruella. Limburgose. Contains augite, olivine, nephelite, plagioclase, magnetite, apatite, and a little biotite. Sp. gr., 3.122, 22° 0.55 per cent K,O and 2.10 per cent Na,O soluble in 1:40 nitric acid. P. R. C. 1337. KoO sess vesceas 2. 59 -95 1.04 H20 at 110°... 12 25 = 28 32 H20 above 110° 86 1.79 -73 1.50 4. MISCELLANEOUS ROCKS. A. Obsidian, Obsidian Hill camp, Tewan Mountains. Liparose. Described by Iddings, 7th Ann., p. 292. A rhyolitic obsidian, containing grains of iron oxide and a few microscopic feldspars. Resembles that from Obsidian Cliff in the Yellowstone National Park. Analysis by L. G. Eakins, record No. 851. Sp. gr., 2.352, 23.5°. B. Trachyte (?), from Los Cerrillos. Described by Diller, Bull. 42, p.39. Analysis by F. W. Clarke, record No. 346. Rock composed chiefly of orthoclase, with a con- siderable amount of biotite, epidote, pyrite, and limonite, and some amorphous sub- stance. It is the matrix or gangue rock of the Los Cerrillos turquois. C. Gabbro porphyry, Mount McKensie, Los Cerrillos Mountains. Andose. Received from J. F. Kemp. Described by D. W. Johnson, in School of Mines Quart., vol. 25, p. 82. Analysis by George Steiger, record No. 2027. Contains augite, plagio- clase, orthoclase, and biotite. P.R. C. 1300. D. Andesite, Country rock, Bonanza mine, Hillsboro. Shoshonose. Contains plagioclase, orthoclase, augite, and hornblende. E. Syenite porphyry, Cook’s Peak. Dacose. Contains orthoclase, plagioclase, biotite, homblende, and quartz. Rocks D, E, described by C.H.Gordon. Analyses, as yet unpublished, by G. Steiger, record No. 2238. F. Quartz syenite, near Merrimac mine, 3 miles east of Organ City, Organ Mountains. Contains orthoclase, albite, quartz, biotite, augite, titanite,and magnetite. Descrip- tion furnished by W. Lindgren. Analysis by Steiger, No. 2371. IGNEOUS AND CRYSTALLINE ROCKS. 125 A B c D. E F SIGs coasts tins e waar ene carne eee eas 76,20 | 56.68] 48.21] 54.54] 6295] 61.12 Rs Op cae naires acd Saad Lec hakene BRateucr 13.17} 16.62] 17.96| 14.66] 15.91] 15.78 Rea Os cra carat Moe aeananannanaenwaneccapreekenia 34] 628] 5.18] 4.20] 3.30) 2.69 BO gooiccenee her Gk ep ecemenuiesmamuaceckuenn ae goa TB Na enaces, 4.47] 2.74| 137] 3118 MBO ui cevincs aed nmeceacmy emanecicn 19 70| 4u| 3.21] 218] 190 Cad. 42 59] 9.72] 5.64] 446] 3.95 Na.O 431 1.03] 3.68] 3.47] 405| 414 Ks0 ae cvs) 446) 18 | 299) Bas] 295) 44s NOPE 1098 aocg.c acd sues clcecacee nt ata wens “a] ito} 17 32 ae. s88 \ 3.28) ya] a7] 119 56 H¢O aD 0V6 08 i ieesevesnatetaeeorcdsadeaersacacas iO ARIZONA. 1. GLOBE DISTRICT. Rocks described by F. L. Ransome in P. P. 12. Analyses A, F, by W. F. Hille- brand, record No. 1988. The others by E. T. Allen, record Nos. 1952, 1955. A. Quartz monzonite, Lost Gulch. Toscanose. Contains quartz, plagioclase, microcline, biotite, iron ore, titanite, apatite, and zircon. P. R. C. 1297. B. Granite porphyry, one-half mile southwest of Hog ranch. Lassenose. Contains orthoclase, quartz, oligoclase, biotite, and iron ore. P. R. C. 1293. C. Granite porphyry, 2 miles south of Schultze ranch. Lassenose. Contains ortho- clase, quartz, oligoclase, and biotite, with some chlorite, epidote, and iron ore derived from biotite. P. R. C. 1292. D. Granitite, 1 mile west of Schultze ranch. Lassenose. Contains oligoclase, quartz, orthoclase, biotite, muscovite, magnetite, apatite, and zircon. P. R. C. 1291. Ke a 3. 69 3. 63 3.34 H20 at 105° = ‘ - 86 1.17 226 H20 above 105° 2 ‘ 1,49 .97 28k Ti x 6 22 .19 -23 01 | trace trace 08 - 08 trace Nera Re ate Se trace trace | trace trace 07 07 04 126 ANALYSES OF ROCKS AND MINERALS, 1880-1908. E. Biotite dacite, one-fourth mile north of Old Dominion mine. Toscanose. Con- tains plagioclase, sanidine, quartz, biotite, hornblende, apatite, titanite, zircon, magnetite, and glass. P. R. C. 1299. F. Quartz-mica diorite, Florence stage road 2 miles south of Pinal Peak. Tonalose. Contains labradorite, quartz, biotite, microcline, muscovite, titanite, apatite, mag- netite, and zircon, with secondary chlorite, epidote, sericite, calcite, and a little horn- blende. P. R. C. 1295. G. Quartz-mica diorite, 2 miles south of Hog ranch, Pinal Mountains. SR. 3 of vaalase. Contains labradorite, quartz, biotite, orthoclase, muscovite, magnetite, titanite, apatite, and zircon, with secondary epidote, sericite, and chlorite. P.R. C. 1296. H. Olivine diabase, 1 mile northwest of Black Peak. -Auvergnose. Contains plagioclase, augite, olivine, biotite, iron ore, apatite, and titanite. Perfectly fresh. P.R. C. 1298. E F Ga. H. SiO geise cc ocenaenensis SESS Geiduakarisenaaeee SRSEEEERR Ga See een 68.76 | 58.74 | 61.99 49. 00 PV 5 Oise spesnicpe ech niabives pave a SoAisie diet ersen uecateiaeigle Deedee G EROACOLCRES TERS 15.48 | 16.02] 15.81 16. 87 Bes Oa casita sedacions okionnicicas coco testes ne BGS ne RSS USE 2.50 4.16 3. 28 2.09 FeO. -44 3.50 2. 69 8.50 MgO -56 2.18 2.24 6.70 CaO. 2.23 5.12 4. 62 10. 21 Na,O 3. 89 3.26 2.73 2. 57 K20.... --| 3.88 2.39 2.51 - 66 FeO iat 105 wrxeacocstrveiageraicteens eemeievemomicniestlan iprsaeciesiemiciess sig, Ansscetaasints peareinraaeee -79 - 83 91 a2 HO above 106. csscccmiseasenarecenieds ca at Sees Va DeaheeeeROA SeewieeT 57 1. 60 1.99 1.00 WO ges joins caciant Shah de Sue ox aoeeeRae Dre SER OS ER ERE Se eee Seely -50 1.29 .94 11 D1 ae ss cree arsnicd nininaicasierisccae es Le Caaetieeeeat ok aR Ree ak ements - 03 +05 - 03 . 02 P205 - 06 -56 alt, 13 Cl.... - 03 | undet. | undet. 05 MnO. - 02 -22]} trace 10 BaO. 08 -10 - 06 trace StO) sox swatesuniasnpascond on eine eam ee mesh ae Sate acme RE SEE Ee Ra SHR none | trace | undet. none NiO) ccosa: cicizctciasesrotomcncisaine Syewem etl occes SoS Ea eM cets Te ER EMRE secieeae none | trace?; undet.| none C19 O8 vias ee crenrecsiwntatninin seraainia sien Seeiouineie naiaiateitia nieeraioe 2h oe Rinse NeTINE DONE: | 5 .s:-sesscaie trace VO. onc exe cuweewcewere wen pea nese ewe reais mata actotnee ot omer meoRe Sl ey tiegiges [bememeas seems trace Severs: none |........ trace none FeSe none phil Beer peers Desens ts cca ccinctiaes Maas Heseeeke eR Gee Wa sd state nes ueckatee sia acl geceeane trace |undet. | undet. 2, BRADSHAW MOUNTAINS QUADRANGLE. Analyses by George Steiger, record No. 1996. Petrographic data furnished by C. Palache. Published by Jaggar and Palache in Folio 126. A. Quartz monzonite porphyry, Battle Flat. Tonalose. Contains quartz, ortho- clase, oligoclase, green hornblende, and a little apatite and magnetite, with much secondary chlorite and calcite. P. R. C. 1694. B. Camptonite, Crazy Basin, 2 miles east of Alexandra. Shoshonose. Contains brown hornblende, augite, biotite, feldspar, magnetite, and apatite. The feldspar is apparently about equally orthoclase and andesine, but largely altered to sericite and calcite. P. R. C. 1695. C. Basalt, facies of trachydolerite, headwaters of Little Ash Creek. Awvergnose. Contains labradorite, violet augite, olivine, magnetite, and abundant apatite, with secondary serpentine. P. R. C. 1696. D. Trachydolerite, headwaters of Little Ash Creek. Akerose. Contains oligoclase, augite, a little orthoclase and nephelite, xgirite, olivine, and abundant magnetite and apatite. P.R.C. 1697. E. Zoisite-hornblende diorite, head of Yava Wash. Kedabekase. Contains zoisite, about 47 per cent; actinolite, 17 per cent; quartz, orthoclase, albite, chlorite, kaolin, and magnetite. P. R. C. 1698. : IGNEOUS AND CRYSTALLINE ROCKS. 127 2. 37 3.13 5.24 64 4, 44 -50 2.24 32 1.95 1.24 1.00 1.57 3.39 89 59 3.56 1.24 1.04 2. 41 23 3.13 58] mone 28 72 56 +32 trace 07 23 .12 none 3. MORENCI DISTRICT. Rocks collected by Waldemar Lindgren and described in P. P. 43, p. 168. Analyses by W. F. Hillebrand, record No. 1997. A. Fresh porphyry, Ryerson mine. 100-foot level. Lassenose. B. Altered porphyry, same locality as A. C. Altered porphyry, chalcocite zone, Humboldt stopes. D. Surface alteration of altered porphyry, Copper Mountain. E. Primary silification of porphyry, Ryerson mine. 4. MISCELLANEOUS ROCKS. A, B, C, D. Mica basalt, Santa Maria Basin. See Iddings, Bull. Phil. Soc. Wash- ington, vol. 12, p. 212. Not‘fully described. Analyses by W. F. Hillebrand, record No. 1261. A. Auvergnose. B, C, D. Monzonose. E. Hornblende porphyrite, Sierra Carrizo. Dacose. Described by Cross, 14th Ann., p. 165. Contains plagioclase and hornblende, in a groundmass of quartz and orthoclase. Analysis by Hillebrand, No. 1429. 128 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 3 2, 28 6. 29 4.43 3. 49 1.33 5.77 6, 23 6, 05 4.77 2.65 3.08 3. 00 4. 40 4.86 4.95 4,69 2.93 2. 67 Li 1,20 -27 1.18 1.10 1,37 - 60 87 -94 94 - 60 58 - 63 65 - 28 - 08 ol? 09 +15 05 07 trace | trace | trace |. 09 19 22 +23 15 trace | trace? | none trace 99.98 | 100.36 | 99.92 99. 86 F. Typical hypersthene andesite, San Francisco Mountains. Lassenose. Not described. Analysis by T. M. Chatard, record No. 270. G. Recent lava, 2 miles south of Mount Trumbull. Camptonose. Not described. Analysis by L. G. Eakins, record No. 1024. H. Tourmaline-bearing alkali granite, 5 miles northwest of Bisbee. Liparose. Contains microperthitic orthoclase, quartz, oligoclase, biotite, tourmaline, muscovite, apatite, zircon, and iron ore. P.R.C.1395. I. Granite porphyry, 3} miles north of Waco Junction, Bisbee quadrangle. SR. 7 of alaskase. Contains quartz, orthoclase, oligoclase, biotite, muscovite, zircon, and ironore. P. R. C. 1396. Rocks H and I are described by F. L. Ransome in P. P. 21. Analyses by George Steiger, record No. 2034. 56 9, 32 . 36 85 8.29 | none 14 2.89 8. 87 - 62 none 5. 05 4.27 3. 60 26 2. 67 1,27 ae 8.50 20 \ +85 m2) 17 56 2. 66 21 13 99.78 | 99.99 | 99.70 99.71 The following rocks, from Mohave County, are described by F. C. Schrader in Bull. 397. Analyses by G. Steiger, record No. 2328. J. Minette, Champion mine, Cerbat district. Shoshonose. Contains andesine, biotite, augite, orthoclase, iron ores, and apatite, with some secondary chlorite. K. Trachyte, Goldroad mine. Omeose. Contains orthoclase, albite, quartz, iron ores, apatite, and zircon, with secondary serpentine, epidote, and sericite. L. Trachyte, Goldroad mine. Contains sanidine, biotite, chlorite, epidote, serpen- tine, and quartz. : IGNEOUS AND CRYSTALLINE ROCKS. 129 k. L hiciciasnsSled Saere ar EAE S Kawares Seba nee We Ada Sento: Me Hookeghemoes oe ee tees 66. 46 58.74 See. wana sila Sterotnuas so. aMnaetdig nia te oy nerd aaeaiaae? 14.14 15. 09 Su siaqralch an cnet ava eiate & Sapte eeeemareahcciSNy dea reed ake 4.07 4. 66 Bia mien wien ts at ly NEE RONE con aah cnet - 40 84 se eedyee Wits Sessa eguiaacnaasiecls eubeSes 67 2.75 ES aad cis aes fe oral dutease fale ase Teka ep aay Tyan 78 2. 68 Easaclesc antici daeadnaySierstasaitve Ser yhevheesnias ie Reaves 1.26 25 Stile allies eeu te en eh ee GE a Mra ogee 9. 26 8.05 Scardasaensd SANG Riese ncsede 3a Sara ccepetanenis tse Ghee Aue ctichave 78 2.08 Viet misiinhe. Sdatatebeshs pinks Sinem gReeanabalene agama are 1.28 3.09 shihisenaichs Samet Lekay ve EERE . 83 - 98 Piha eee eastey ya Senate BE de Fic 05 - 02 wl Sr i ders oe EIS Si Sta en Soba Suid none 61 RM ae Me aus Sle ee i antleneyeGL2 igs apse ES +25 - 40 seated (Sh. sad eared G2 earayenees at Mad anaie none none sechtaegl eceacihso Sposa aa ieee Nyaa So Rees 03 - 09 minis deibeneaeceaed $8 Bovewtaine St psitemernes 06 -07 stabs Siig Seieraarade Oo PERG aINa AG PURaie Rees Beeistenineniscii selene eaeehee 03 -04 100.35 | 100. 44 NEVADA. 1. TONOPAH DISTRICT. Rocks A to F, inclusive, represent hornblende andesite and its various alterations. Collected by J. E. Spurr, and partly published in P, P. 42. Analyses by George Steiger, record No. 2067. A. Hornblende andesite, California-Tonopah shaft. Pantellerose. The freshest obtainable. Contains andesine, pseudomorphs of chlorite after hornblende, some quartz, pyrite, and apatite. B. Hornblende andesite, also relatively fresh. No.2 shaft. Kallerudose near pan- tellerose. Contains partly altered, striated feldspars, and pseudomorphs of quartz, pyrite, etc., after biotite and hornblende. The rock is partly altered to quartz and muscovite. C. Kaolinic alteration of the andesite, from a pit in the saddle between Halifax shaft and the Mizpah mine. Entirely altered to quartz, kaolin, and muscovite. D. The andesite, altered to chlorite and calcite; Mizpah shaft, 675 feet down. Contains chlorite, calcite, a little quartz, feldspar, sericite, hematite, zircon, and apatite. E. Hornblende andesite, partly altered to orthoclase (?), Mizpah Hill. Ferro- magnesian minerals completely decomposed. Some secondary quartz is present. F. The andesite altered to quartz and muscovite, Mizpah vein. Little more than quartz and muscovite can be made out. \ B Cc D: E F 60.45 | 71.14] 55.60] 73.50 72. 98 17.78 | 15.24] 16.70] 14.13 14. 66 5. 86 1.77 2.23 1.51 1.01 25 26 3.51 26 16 1.55 16 2. 60 21 33 1.04 09 4,27 12 18 3. 58 24 4.08 24 none 2.11 6.31 3.17 5.11 6.03 2. 86 85 -88 1.07 97 2.93 2. 87 3.06 2.81 2.95 81 48 -72 47 44 none | none 2.76 | none none 28 «05 28 09 16 none 05 | none TY jawcsicces pisses yaa 02 | none 3» |arsrcorcsrtess 2 OG hrais atevesralls ane orien aterecnctats undet. undet. |undet. |undet, | undet. | undet. 07 17 -12 -19 | undet. 99.63 | 99.70} 99.98 | 99.91 99. 87 SrO not looked for. 130 ANALYSES OF ROCKS AND MINERALS, 1880-1908. Rocks G to M were also collected by Spurr. Analyses L, M by W. F. Hillebrand, record No. 2087; the others by George Steiger, No. 2088. G. Early andesite, hanging wall of vein, 300-foot level, Mizpah mine. A more advanced stage of quartz-muscovite alteration than F. H. Extreme stage of alteration of andesite to quartz and muscovite, west drift, Mizpah vein. Quartz, with much muscovite. I. Augite-biotite andesite, Mizpah extension shaft. Contains phenocrysts of plagio- clase and augite, with some alteration to calcite and serpentine. J. Pyroxene-biotite andesite, completely decomposed. Montana-Tonopah shaft. Feldspars entirely altered to calcite, sericite, and quartz. Biotite and hornblende altered to chlorite, calcite, quartz, sericite, siderite, and pyrite. K. Biotite dacite, north side of Mount Brougher. Toscanose. Contains plagioclase, possibly orthoclase, biotite, and a glassy groundmass, L. Biotite andesite, Halifax shaft. Harzose. Contains plagioclase, biotite, augite, and magnetite. M. Biotite-pyroxene andesite, North Star shaft. Entirely altered. Feldspar altered to calcite. Pyrite, siderite, and rutile are present. 2. GOLDFIELD DISTRICT. Rocks collected by F. L. Ransome, who supplies the petrographic data. Analyses by G. Steiger, record Nos. 2249, 2253, 2339. A. Altered rhyolite, east slope of Vindicator Mountain. Contains quartz, alunite, calcite, and sericite, with a small amount of undeterminable material. B. Pyroxene-hornblende andesite, first hill northwest of Vindicator Mountain. Tonalose, near yellowstonose. Contains labradorite, augite, orthorhombic pyroxene, hornblende, magnetite, and apatite, in a glassy base. C. Hornblende-pyroxene andesite, 2 miles northeast of Black Butte. Tonalose. Contains plagioclase, augite, enstatite or bronzite, hornblende, and magnetite, in a glassy groundmass. D. Hornblende-biotite andesite, 1 mile northeast of Black Butte. Améatose, near yellowstonose. Contains labradorite, hornblende, and biotite, in a glassy groundmass with specks of magnetite. E. Pyroxene-hornblende andesite, 1 mile northeast of Columbia Mountain. Tona- lose. Contains labradorite, augite, hypersthene, magnetite, apatite, and glass. Traces of secondary calcite and chlorite. IGNEOUS AND CRYSTALLINE ROCKS. 131 Ik. Dacite, near summit of Diamond Peak. Harzose near tonalose. Contains pla- gioclase, hornblende, augite, biotite, quartz, apatite, magnetite, and glass. G. Altered dacite, Combination mine. Contains quartz, kaolin, sericite, pyrite and possibly alunite. H. Biotite dacite vitrophyre, 1 mile southwest of Black Cap Mountain. Amiatose. Contains labradorite, biotite, and quartz in a glassy base. I. Dacite, one-half mile northeast from summit of Columbia Mountain. Tonalose. Contains the same minerals as F. J. Mica dolerite, 2 miles east of Black Butte. Hessose. Contains anorthite, augite, biotite, olivine, magnetite, occasional hornblende, scanty apatite, and a little calcite. The olivine is serpentinized. K. Olivine dolerite, mesa above Rabbit Spring. Hessose. Contains anorthite and olivine in a groundmass of plagioclase, augite, olivine, magnetite, andapatite. Avery little hornblende is also present, with a trace of calcite. The olivine isserpentinized. Fe G. H I J. Kk ORs ceca bt led dteeae dias Bosom cei cnsae aesictans Sarees esereie 59.99 | 59.95 | 48.59 48.20 AlDOSy cade tsaits Sediciaeiwea necwe/imameniene 16.14 | 15.77) 17.80 21. 47 PQ OS ncciccamicncnani nese sveamnwrnae ssa 4.42 3.34 8.70 5.89 BO O's 53 srsicines cps crorsanstarnaions jnapaamnisiaecte ase 13 2.34 93 2.20 ME Ole razsicisie tact ammnciote essai a3 1.51 2.73 4.85 3. 33 CAO secaoumich wtvny wenemannnieamessiy 4.17 5.84 | 10.49 10. 60 NGO ievacccis oeeiaceaadiate hiemeeese sens 3. 04 3. 07 3. 06 3.10 EEO aseiataiuls cbc igen oecieReROS ORME 2.82 2. 52 1.70 1.33 TOA G 05 sic 2.55 ssc crccasay ede siaisinmrateinernbes 3.35 95 -76 96 H20 above 105° 4.06 2.00 67 1.20 132 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 3. BULLFROG DISTRICT. Rocks collected and described by F. L. Ransome. Analyses by G. Steiger, record No. 2272. A. Porphyritic rhyolite, southeast slope of Bush Peak. Contains quartz, orthoclase, plagioclase, mica, magnetite, and apatite. B. Rhyolitic glass, west slope of Burton Peak, near summit. Contains pheno- crysts of plagioclase, hornblende, and mica. C. Dacite, east slope of Black Peak. Contains plagioclase, orthoclase, quartz, mica, and magnetite, in a glassy groundmass. D. Quartz basalt, knob east of summit of Black Peak. Contains plagioclase, quartz, orthoclase, olivine, pyroxene, biotite, and magnetite. Olivine serpentinized. E. Leucite basalt, road to Indian Springs, 14 miles north of Rhyolite. Contains olivine, leucite, augite, apatite, and possibly a little nepheline. 13 65 39 2.37 4.10 20 - 06 - 66 2.69 9.37 58 1.90 2.01 6.55 11.62 2.96 3. 30 3. 89 3. 28 2.96 4.65 4, 22 5.3] 3.33 1.30 H2O at 105°...... 1.03 81 1.89 12, 1.91 H20 above 105° 96 3. 78 1.16 1.38 3.94 iO2- 18 25 1.53 95 1.46 ZO StsaeScsctsaix aia: xian sha ay ahshe sata tasnies in ach asia rchetdhsiaislels ave sinutsiaiateasizie'a||| aes zisietats OW, mis recicea| cto sacces, 02 COz.. none |} none/} none 1.12 63 PyO pe senna ew ancecvenn Gerad Here omen 2 trace - 08 22 40 MDO oxacccoms wereeecactagtes ce oe egemeetnena ve teeters -03 -06 04 10 12 BaQerteneus sy 14 seeeete none - 03 15 0: 16 ST Os ree Se eutieaeed ce Serene ee pecan asain’ none - 03 03 | undet. 4 4. MISCELLANEOUS ROCKS. A. Rhyolite, south-southeast of McClellan Peak, Washoe. Mihalose. Contains feldspars, orthoclase predominating over plagioclase, quartz, mica, and hornblende. B. Dacite, spur northeast of McClellan Peak. Toscanose. More plagioclase than orthoclase, much mica, less hornblende, little quartz. Rocks A and B are described by Hague and Iddings in Bull. 17. Analyses by F. A. Gooch, records Nos. 119, 129. FeO not separately determined. C. Basalt, summit of Richmond Mountain, Eureka. Hessose. Red, porous. Con- tains augite, less hypersthene, feldspars, and magnetite, in a glassy base, with accessory olivine and quartz. Analysis by J. E. Whitfield, record No. 424. D. Andesitic perlite, south of Carbon Ridge, Eureka. Amiatose. Contains plagio- clase, hornblende, biotite, quartz, hypersthene, augite, magnetite, apatite, and zircon, with a glassy base. Analysis by W. H. Melville, record No. 1240. Rocks C and D are described by Hague and Iddings in Mon. XX. E. Dacite, west side of Silver Peak range, south of Emigrant Road. Lassenose- toscanose. Contains phenocrysts of plagioclase, sanidine, possibly quartz, aaa hornblende, augite, magnetite, and apatite. F. Spherulitic rhyolite, southeast of Red Mountain, Silver Peak range. Toscanose. Contains sanidine, quartz, biotite, titanite, magnetite, and zircon, in a spherulitic groundmass. zs Analyses E and F by George Steiger, record No. 1887. Rocks E, F, collected by H.W. Turner. Described in P. P. 55. IGNEOUS AND CRYSTALLINE ROCKS. 133 AL B. Cz D. E. F. SlOseencinds pepe ceaei wen seleatetouens teens ux ents 73.07 | 69.96 | 50.38] 65.13] 69.76 72. 54 Eads O geeantet bread acdetuach hae oes AAR AP wells gon 5 11.78 | 15.79] 19.83) 15.73] 14.05] 13.32 VEN Ogi ccs Saeeerereus seentamennn Seemann aoaa \ 2.30, 2.50] 6.05] 2.24] 2.05 2.41 ROO creeds cian cs Oia ee eS Sada cmemws ae ok 2.00 1.86 | none 09 MS Os sci tsa cenceasetnd eisioszactoomastomcia atest in asacaitnsbtccapepageas gh 39 64 5.36 1.49 17 51 CAO de Soa a eas Achiersheatht Sasa rtewrclesieinga Muu mesees. 2.02 1.73 | 10.03 3. 62 1.73 1.37 Nas Oe w e go eI . PY SRPPNrAS RASEARSS 100.17 | 100.18 | 100. 03 F. Rhyolite, 34 miles southwest of Grizzly Peak. Toscanose. Description fur- nished by Turner. Contains sanidine, with less quartz and biotite, in a glassy ground- mass. Analysis by Hillebrand, record No. 1461. P.R. C. 776. G. Hornblende andesite, 4 miles from Pilot Peak. Tonalose. Described by Tur- ner in 14th Ann., p. 441. Contains plagioclase and hornblende in a groundmass carry- ing grains of magnetite. Analysis by Hillebrand, record No. 1432. P.R. C. 716. H. Hornblende-pyroxene andesite, southwest base of Mount Ingalls. Tonalose. Description supplied by Turner. Contains plagioclase, rhombic pyroxene, augite, brown hornblende, and magnetite, with much glass in the groundmass. Analysis by Hillebrand, record No. 1456. P.R. C. 728. I. Hypersthene andesite, Franklin Hill. Hessose. Description supplied by Tur- ner. Contains plagioclase, rhombic pyroxene, augite, and magnetite. Probably no glass. Analysis by Hillebrand, record No. 1548. P.R. C. 754. F G i. | I DOD. sewinistedsidsiews sieesee sense 58. 47 56. 88 AlO3 18. 80 18. 25 Fe.03 3.34 2.35 ROO seis varices’ Pea taney ee 2. 64 4. 45 ik se sraints ieee rciasarsia teh 2.69 4.07 CAO Scie itis cisietnra ax eect eons 6. 60 7.53 NG2O occspdacodadeuaonnderes.e eb 3.58 3.29 KiiO see Siete ataeneserauiest 5 2. 01 1. 42 Ha0 at 100°. 222 e eee eee. 42) 114], .24 H20 above 100°......-.--.----- - fé - 92 50 TiO s). woe saanictanicnenee . 51 » 45 Pa Op sreniswisternryeinsis os veeaeeees ~22 . 30 NO ie cia siacrcicmwsinas sue ceniaae oh 13 «18 DEO! 35 dieisjcecsqaversicunia salad ceuien - 05 . 04 Ba Oss aisnscsncoate ketenes - 09 il Dlg Osha cracernnecaeed aSaG Daal ose ose aS SSRIS as CATR TER eS trace trace 100.19 | 100.06 146 ANALYSES OF ROCKS AND MINERALS, 1880-1908. J. Dolerite, Mount Ingalls. Hessose. Described by Turner in 14th Ann., p. 441. Contains plagioclase, augite, hypersthene, magnetite, and a few olivines. Analysis by W. F. Hillebrand, record No. 1273. P. R. C. 739. K. Dolerite, Mount Ingalls. Hessose. Also in 14th Ann., p. 441. Like J, but with scarcely any olivine. Analysis by Hillebrand, record No. 1432. P. R. C. 740. L. Basalt, 4 miles southeast of Mount Ingalls. Andose. Alsoin 14th Ann., p. 441. Contains plagioclase, olivine, augite, and magnetite. Analysis by Hillebrand, record No. 1273. M. Olivine basalt, 14 miles from Franklin Hill. Hessose. Contains plagioclase, augite, partly altered olivine, magnetite, and probably some glass. Description sup- plied by Turner. Analysis by George Steiger, record No. 1596. P. R. C. 755. N. Serpentine, Greenville. Described by Diller in Bull. 150, p. 372. Besides ser- pentine, the rock contains some magnetite and less chromite, with remnants of the pyroxene from which the serpentine was in great part derived. Analysis by W. H. Melville, record No. 1346. P. R. C. 145. 4. BUTTE COUNTY. Rocks from this county are also to be found under the heading of the Lassen Peak region. The following rocks were collected by H. W. Turner, to whom the petrographic data are due. Analyses, with two exceptions, by W. F. Hillebrand, record Nos. 1432, 1456, 1461, and 1548. Analysis G is by H. N. Stokes, record No. 1562. A. Granodiorite, north side of south fork of Feather River, opposite Enterprise. Lassenose. Described in 14th Ann., p. 441. Contains plagioclase, potash feldspar, quartz, hornblende, brown mica, and accessory minerals. The ferromagnesian minerals are largely altered to chlorite. P. R. C. 720. B. Granodiorite, 2 miles east of Bangor. Tonalose. Composition like A. The mica is largely altered to chlorite. See 14th Ann., p. 441. P.R.C.717. C. Diorite, South Honcut Creek. Beerbachose. Description supplied by Turner. Contains feldspar, probably all plagioclase, brown hornblende, and a little chlorite. P. R. ©. 775. D. Quartz diorite, 4.6 miles south of Table Mountain, on ridge between Butte and Plumas counties. Camptonose. Described in 17th Ann., pt. 1, p. 521. Contains hornblende, feldspar, quartz, rutile, and a little secondary chlorite and epidote. P. ay C. 758. E. Amphibole, separated from E. Analysis by William Valentine, record No. 1723. (1,0, determination by Hillebrand. IGNEOUS AND CRYSTALLINE ROCKS. 147 A B i D E SiOa. 70.36 | 63.43 | 57.87 | 54.64 50. 08 AlsOs. 15.47 | 14.20] 16.30] 12.06 7.97 Fe203 1.54 1.71 1.81 2. 69 FeO 1.17 4. 56 3. 86 5.03 6.71 MgO 2.35 5.50} 11.86 16.31 CaO. 3.18 5. 51 5. 53 7.74 11.21 NayO.....------+- --| 4.91 3. 49 5.01 2.35 1, 22 sea etn sees Se nae aay a te 46 H20 at 100°..... Ss is 215 | 6260 AD Tete H20 above 100°. TO 9 vs sors ntarcare PY ire ogee aig ease Vise vets exsniciee CriOa.secuursesseceese NiO): cceeencerecnaeey | MnO.......--------++-- ; 5 7 STO watevinns senescence .. trace; trace | trace | trace |........ BAO boc peincinaecinnsssd Shs - 06 | - 06 05 05 none MSDS Obs Sch Sie vad ab aia reenact dase Guctasecansiats (2h:" lage Sommtemmamredestay ns - trace | none} trace! trace |.......- 100. 08 | 99.85 | 100.12 | 100. 01 | 100. 46 F. Meta-andesite tuff. Described in 14th Ann., p. 441. Contains plagioclase, augite, epidote, chlorite, and secondary hornblende. P. R. ('. 719. G. Uralite diorite, 1 mile southeast of Forbestown. Ornose. Described in 17th Ann., pt. 1, p. 521. Contains plagioclase, hornblende, and magnetite. P.R.(.751. H. Basalt, Oroville, Table Mountain. Camptonose. Described in 14th Ann., p. 441. Contains plagioclase, olivine, augite, and magnetite. P.R. (. 718. I. Altered peridotite, 5 miles northeast of Strawberry Valley. Largely serpentine, with olivine, hornblende, magnetite, and calcite or dolomite. P.R. C. 742. 100. 02 | 100. 38 | 99.81 | 100.18 a Includes possible TiO. 5. SIERRA COUNTY. Rocks collected and described by H. W. Turner. See paper in 17th Ann., pt. 1, p. 521. Additional details supplied by Turner are given here. Analyses A to II by W. F. Hillebrand, record Nos. 1456 and 1548. Analysis I by H. N. Stokes, record No. 1514. 148 ANALYSES OF ROCKS AND MINERALS, 1880-1908. A. Granulite (aplite), Yuba Gap, road east of Sierra Buttes. Toscanose. Contains orthoclase, microcline, quartz, plagioclase, some shreds of greenish mica, and a little iron ore, chlorite, and apatite. P. R. C. 730. . B. Granulite (aplite), dike east of Milton. Toscanose. Contains orthoclase, quartz, plagioclase, a little microcline, brown mica, and iron ore. P. R. C. 734. (. Biotite-quartz monzonite, Indian Valley. Lassenose. Contains plagioclase, orthoclase, quartz, brown mica, apatite, and iron ore. P. R. C. 737. D. Quartz diorite porphyry, dike in Indian Valley granite. Yellowstonose. Con- tains plagioclase, hornblende, biotite, and quartz. P. R. C. 738. E. Quartz-mica diorite, large area east of Milton. Harzose. Contains plagioclase, a turbid feldspar which is apparently not orthoclase, quartz, green hornblende, brown mica, iron ore, and apatite. P.R. C. 732. 14 24 03 20 24 62 41 95 trace 15 18 30 trace - 08 07 18 03 OF lecexinen 06 14 09 12 10 100. 44 | 99. 09 | 99.99 | 100. 23 F. Diabase porphyry, dike east of Milton. Camptonose. Contains labradorite and other plagioclase, augite, and hornblende, the last mineral being perhaps secondary, P.R. C. 733. G. Hypersthene andesite, point northeast of Goodyears Bar. Yellowstonose. Con- tains plagioclase and rhombic pyroxene, a little augite, and scales which seem to represent former biotite, now replaced by magnetite. P. R. G. 731. H. Hornblende-pyroxene andesite, dike southeast of Poker Flat. Tonalose. Con- tains plagioclase, augite, hornblende, magnetite, some glass, and occasional quartz. P.R. C. 736. I. Quartz-bearing andesite, northwest of Downieville. Tonalose. Contains plagioclase, augite, enstatite, magnetite, occasional quartz, and probably glass. P. R. C. 753. F G. H I. SORes. nay hsecnemcthiccins Heke vanieededuiskls 28 Sodamebk ass 24 aeyelnosad aaaah 51.27 | 66.94 | 59.34 60. 02 Ag O xiv tare srerieecele ie actniatass ots imi peereishoneep ai a Pa ete wa eaeteeetat distances eae 12.14 | 16.49] 17.61 16. 07 POs Os wren we cov auinne cewwrveetstng sie we peaches ree sxe ee ie Reis th eetlaiene, Uae SY ter 2.51 1.41 3. 63 2.17 FRG O torease caste arg tide ecto siviaeg Win PO tard aaah eR ences tease Perce ciagoaee- ad ge 6.71 1.87 2.28 3. 46 SM Oe poh ec poh asta meas nace oresaensaci Sole sid Bich meiednei ds eeisie Momus cis 10. 88 1.98 3.50 4.57 BIO) assis cadsis see epee diana paiesesake oer’ Sess capcnuscotancy anit dla tee cienecahliacs & be’ damagesiqanesecd soetale 10. 32 4.77 6. 45 7.01 INARO es ocr owes deepaiehinale sh Ao ead eile dread a dalanincumareat assent auveol 2.00 3. 88 3. 40 3. 55 K20........ 1.63 1.65 1.94 1.59 H20 at 100°... 17 85 64 24 H20 above 100° 1.16 22 74 45 TO gs sciscaten eines 60 30 82 42 P20. - 21 12 25 17 C130} oe nsacwecersceemsa is Reoawaccene sere ee demas a Meme ease meen eemasces [Leaueaeapaeanienies trace INHO aicicn os sig tdn eet otosee 08 | cca) bass sa Seleeemesee MORE ese ep crass ign e sehuninaieren dabetnaecadheutiass.4aseneengenen 21 13 12 10 IT Og fsgsdnsejese ae gaesu st dStcss nus 2s clonayybgayajargtanas fe nd spades ibis giutesajaajeob arma sierslccalasinee ber sia ee trace? 05 04 trace BAO) sc oiten ta shedis Siciencetshtncavmydaias piecrcwlnanae tucneesdtentaceds 07) 07 11 Dlg Oh ayia CAEP ONDR ES aS PO ziacan mieeaas SwaAtateenNes Hee reR ined trace | trace | trace none WO gh cosistsccccw ee taatie s tenses xnnuiness ta cammmmns ce KE Ramued Heke lees me lees aaaas ame 99.92 | 100.23 | 100. 37 99. 96 IGNEOUS AND CRYSTALLINE ROCKS. 149 6. NEVADA CITY AND GRASS VALLEY. Rocks of a mining district in Nevada County, described by Lindgren in 17th Ann., pt. 2, p. 1. 2 A. Granodiorite, 1 mile southeast of Nevada City. Yellowstonose. Contains horn- blende, biotite, quartz, plagioclase, orthoclase, magnetite, apatite, sphene, and pyrite. Analysis by W. F. Hillebrand, record No. 1478. P. R. ©. 1521. B. Granodiorite, Kate Hayes Hill, Grass Valley. Harzose. Contains plagioclase, orthoclase, quartz, hornblende, pyrite, magnetite, apatite, sphene, and zircon. Analysis by Hillebrand, No. 1478. C. Hornblende porphyrite, Nevada City. TYonalose. Contains feldspar, horn- blende, quartz, epidote, sericite, and biotite. Analysis by H. N. Stokes, record No. 1531, D. Quartz porphyrite, New Ophir claim, Grass Valley. Tonalose. Contains plagioclase, quartz, uralite, epidote, and augite, and hornblende altered into chlorite. Analysis by Stokes, No. 1531. E. Diabase, near Maryland mine, Grass Valley. Ornose. Contains feldspar, augite, hornblende, ilmenite, pyrrhotite, pyrite, and some chlorite. Analysis by Stokes, No. 1522. F. Diabase, Grass Valley. Bandose. Contains feldspar, pyroxene, hornblende, ilmenite, pyrrhotite, pyrite, and chlorite, and probably a little quartz. Analysis by Stokes, No. 1522. Kg hae ata mea 20 at 110°... . H20 above 110° G. Wall rock, Federal Loan mine. A siliceous argillite, of sedimentary origin. Contains quartz, feldspar, biotite, pyrrhotite, and a little calcite. Analysis by Hille- brand, No. 1478. H. Altered wall rock, Providence mine. Derived from granodiorite. Analysis by Hillebrand, No. 1478. I. Altered wall rock, Providence mine, back vein. Derived from granodiorite and schist. Analysis by Hillebrand, No. 1478. J. Altered wall rock, North Star mine. Derived from uralite diabase. Contains quartz, sericite, calcite, pyrite, and sphene. Analysis by Hillebrand, No. 1478. K. Altered country rock, Idaho mine. Derived from serpentine. Analysis by Hillebrand, No. 1478. 15619—Bull, 419—10——11 150 ANALYSES OF ROCKS AND MINERALS, 1880-1908. | 100. 37 | 100. 40 | 100.28 | 100.79 99. 97 L. Bleached country rock, next to vein, Osborne Hill mine. Derived from sand- stone. Analysis by George Steiger, record No. 1541. M. Altered wall rock, Empire mine. Derived from granodiorite. Analysis by Steiger, No. 1541. Sp. gr., 2.782, 20°. N. Altered wall rock, Ebaugh tunnel. Derived from granodiorite. Mainly quartz and sericite, with pyrite, apatite, sphene, and carbonates. Analysis by Steiger, No. 1541. Sp. er., 2.747, 20°. O. Altered wall rock, Federal Loan mine. Derived from siliceous argillite. Anal- ysis by Steiger, No. 1541. SiO». 71.97 | 58.43 | 56.25 34.91 Al2O: 15.75 | 17.40 | 17.65 15. 55 Fe0. 77 17 76 17 FeO. 45, 2.19 2.64 4.96 MgO 80 1.50 1.69 4.58 CaO. 80 5. 25 4. 46 11.10 INGO) osicvssa.ccents-sinct career nitya anarecctessa eoaisiese cietetece ctbeecaet - 33 1.76 - 30 19 ae eg esses Sh ween tees abe enoseee z 4. a 4. 03 6. oh 4. z 20 al wed at gee eee RT epee Ast tiatevs 2 - 30 380 3 : HO above 100 222. .ccqeascesemies er presses | 2.16 2.61 2. 36 1.86 OO ceca etre re ae cn hau en Ns cc tote axe : 88 none 25 1.65 Pa Op smeniasieteeeceeeeeee test a eee ec, 15 413 21 82 Ti Oe adiets tak once accsteceaCe eee er oni none | none | none none BAO hee spied miss ceeiasneceaanmemcaustaioa catemincee! trace | none 03 none OD, sisscisicisis naceie Gea cairaticmrmeiicianicauaabdgrmelanies trace | none | none none CO tac chee Dida caumece tiene uuee ve hnoanaee 38 4.04 4.82 15. 57 NOSE cara erticr a vndeind steed Ao Aaa anes Gl aetace Ee eteve crate 56 1.59 2. 87 4.20 7. PLACER COUNTY. First, a series of rocks from the Ophir mining district, described by Lindgren in 14th Ann., p. 249. Analyses by W. F. Hillebrand, record Nos. 1419, 1433, 1434. A. Granodiorite, quarries at Lincoln, 8 miles west of Ophir. Tonalose. Contains feldspars, quartz, biotite, and hornblende. P. R. C. 1526. B. Pyritiferous amphibolite, Conrad tunnel. Partly altered. Contains pyrite, hornblende, magnetite, feldspars, quartz, epidote, chlorite, a few scales of mica, rutile, and carbonates. Sp. gr., 2.901, 23° C. Dike rock, near camptonite, Casey’s tunnel, Flat Ledge, Duncan Hill. Placerose. Contains hornblende, feldspars, pyrite, and apatite, with secondary epidote and quartz. IGNEOUS AND CRYSTALLINE ROCKS. 151 D. Altered wall rock, Mina Rica vein. Sp. gr., 2.979, 20°. E. Altered wall rock, Plantz vein. These rocks, D and E, contain quartz, musco- vite, a little chlorite, pyrite, and sphene, with carbonates of calcium, magnesium, and iron. A B c. D E 60.09 | 37.01 46,13 16.43 | 12.99 15, 82 2.28 +43 -89 3.01 3.57 2.27 4.37 5.49 2,13 5.76 9.78 10. 68 4. 52 «13 -17 -70 4.02 5.30 20 +13 12 1.16 1.92 2. 42 -85 67 12 - 06 10 12 24 09 99.80 | 99.69 99. 68 Second, rocks from other localities in Placer County. Studied also by Lindgren, who furnishes the petrographic data. Analysis A by W. H. Melville, record No. 1346; B, C, D, and E by W. F. Hillebrand, record No. 1419. A. Granite, Rocklin. Lassenose. A normal granite, containing quartz, orthoclase, plagioclase, biotite, muscovite, magnetite, apatite, and zircon, with some secondary chlorite and epidote derived from the biotite. Described by Lindgren in Bull. 150, p.170. P.R.C. 66. B. Granodiorite, Donner Pass. Tonalose. Contains plagioclase, orthoclase, quartz, hornblende, biotite, and sphene. P. R. C. 1525. ‘©. Gabbro, 2 miles south of Emigrant Gap, on road to Onion Valley. Andose. Contains biotite, hypersthene, diallage, plagioclase, and orthoclase. P. R. ©. 1523. D. Gabbro, same locality as C. Vaalose. Contains hypersthene, diallage, plagio- clase, and orthoclase. P. R. C. 1524. E. Quartz diorite, southeast spur of English Mountain. Placerose. Contains “basic” plagioclase, augite, and quartz. P. R. C. 1522. 152 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 8 ELDORADO COUNTY. A. Granitite, Placerville canal, one-third mile north of Ditch Camp No. 7. Alas- kose. Collected by W. Lindgren, who reports it as containing biotite, orthoclase, plagioclase, and quartz. Analysis by George Steiger, record No. 1591. P. R. C. 1527. B. Granodiorite, 2 miles south of Silver Lake Hotel. Amiatose. Collected by Lindgren, who reports it as containing hornblende, biotite, plagioclase, and quartz. Analysis by Steiger, No. 1591. Analyses A and B are published by Lindgren in Am. Jour. Sci., 4th ser., vol. 3, p. 306. P. R. C. 1528. C. Porphyrite, 1 mile southwest of Latrobe. Dacose. Published by Turner in 17th Ann., pt. 1, p. 521. Contains abundant plagioclase, less augite, calcite or dolo- mite, iron disulphide, a little chlorite, and secondary greenish mica. Analysis by W. F. Hillebrand, record No. 1432. P. R. C. 721. 9, AMADOR COUNTY. Rocks collected by H. W. Turner, and analyses published in 14th Ann., p. 441, and 17th Ann., pt. 1, p. 521. Additional data supplied by Turner. Analyses by W. F. Hillebrand, record Nos. 1432, 1456, and 1597. A. Rhyolite, south point of Buena Vista Peak. Magdeburgose. Contains sanidine, quartz, and biotite in a glassy groundmass. P. R. C. 729. B. Quartz monzonite, north fork of Mokelumne River. Amiatose. Contains plagio- clase, microcline, quartz, abundant biotite, iron ore, sphene, apatite, and perhaps tutile. P.R.C.770. C. Quartz monzonite, north fork of the Mokelumne River. Toscanose. Like B. P. R. C. 765. D. Quartz porphyrite schist, 24 miles southeast of Buena Vista Peak. Tehamose. Contains porphyritic quartz and hornblende, also calcite and other carbonates. See 14th Ann. P. R. C. 723. E. Quartz diorite gneiss, north fork of Mokelumne River. Tonalose. Contains plagioclase, hornblende, quartz, brown mica, accessory biotite, and iron oxide. P.R.C. 764. F. Diorite porphyry, north fork of Mokelumne River. Andose. Contains plagio- clase, brown hornblende, epidote, and a little sulphide of iron and chlorite. P. R. C. 769. IGNEOUS AND CRYSTALLINE ROCKS. 153 G. Diorite, north fork of Mokelumne River. Amadorose. Contains quartz, feldspar, biotite, sphene, epidote, and secondary chlorite. P.R. OC. 771. H. Diorite, north fork of Mokelumne River. Andose. Contains plagioclase, quartz, hornblende, biotite, apatite, iron ore, epidote, and chlorite. P. R. C. 772. I. Plagioclase gneiss, north fork of Mokelumne River. Hessose-andose. Contains plagioclase, hornblende, biotite, and apatite. P.R.C. 768. J. Plagioclase gneiss, north fork of Mokelumne River. Bandose. Contains plagio- clase, hornblende, brown mica, apatite, epidote, and grains of iron ore. P. R. C. 767. G H. 1 Ji 69.66 | 55.86 | 52.21 46. 63 17.57 | 19.30] 18.79 19. 47 21 «91 2.71 3. 26 1.04 4.78 5.30 6. 63 2.94 5.11 5.37 4.54 7.31 8.01 9.15 4.91 3.52 3. 31 3.19 71 1.52 1.60 1.55 50 1,23 1.35 1.61 segues all pelatimaisig' fpowateesis - 02 none} trace | trace 02 trace -16 06 21 05 6M |e etscssnis 06 03 -13 08 14 100.09 | 99.86 | 100.23 | 100.08 K. Wollastonite gneiss, north fork of Mokelumne River. Mainly wollastonite, but garnet, quartz, and sphene are also present. P. R. C. 766. L. Melaphyre tuff, altered basalt, west of Jackson. Contains augite and plagioclase, with secondary quartz, chlorite, and chrysotile. Originally glassy in part, “but devitrified. See 14th Ann. P. R. C. 722. M. Reddish-brown mica separated from pyroxenic gneiss, north fork of Mokelumne River, about 1 kilometer above mouth of Bear River. Described by Turner in Am. Jour. Sci., 4th ser., vol. 7, p. 294. Analysis by William Valentine, record No, 1736. s 154 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 10. CALAVERAS COUNTY. Rocks collected by H. W. Turner, and described in 14th Ann., p. 441. Additional data supplied by Turner relative to analysis B. Analyses by W. F. Hillebrand, record No. 1432. A. Metadacite, 1} miles southeast of Milton. Vulcanose. Contains quartz, feld- spar, and hornblende. P. R. C. 777. B. Metadacite, 1} miles northeast of Milton. Lassenose. Contains feldspar, quartz, epidote, chlorite, and iron ore, in a groundmass made up probably of feldspar and quartz. P.R. C. 752. C. Meta-andesite, 14 miles northward from Jenny Lind. Placerose. Contains quartz, plagioclase, epidote, and chlorite derived from augite. > 8 a oO go wm 92 go oo BRaBSSaeas i] x 883 47 11. TUOLUMNE COUNTY. Rocks collected by H. W. Turner, and partly described in his papers in 14th and 17th Ann. The latites were named and described by Ransome in Bull. 89. Some additional data have been furnished by Turner. IGNEOUS AND CRYSTALLINE ROCKS. 155 A. Soda syenite porphyry, dike east of Moccasin Creek. Tuolwmnose. Consists mainly of albite, with a greenish mineral which is probably zegirite. Analysis by H. N. Stokes, record No. 1563. P. R. C. 773. B. Augite syenite, dike on Turnback Creek, about 1 mile north of Carter post-office. Highwoodose. Contains orthoclase and augite, with less plagioclase and quartz. Analysis by Stokes, No. 1642. P. R. C. 789. C. Diorite, dike 14 miles southeasterly from Sonora. Tonalose. Contains feldspar largely altered to hornblende. A few black grains are probably iron ore. Analysis by W. F. Hillebrand, record No. 1548. P. R. C. 759. D. Quartz-pyroxene diorite, large area east of Sonora. Harzose. Contains plagio- clase, quartz, biotite, augite, rhombic pyroxene, and a trace of iron ore. Analysis by Hillebrand, No. 1548. P. R. C. 760. E. Diorite, dike about 14 miles sourtheasterly from Sonora. Camptonose. Con- tains altered plagioclase and hornblende, with epidote, chlorite, and iron disulphide as secondary products. Analysis by Hillebrand, No. 1548. P.R. C. 761. F. Biotite-augite latite, 4 miles southwest of Clover Meadow. Toscanose. Called “‘trachyte-andesite tuff” in first edition of this bulletin. Contains plagioclase, biotite, augite, magnetite, apatite, and glass. Analysis by W. F. Hillebrand, record No. 1597. P. R. C. 762. G. Augite latite, Dardanelle flow, near Clover Meadow. Monzonose. Contains plagioclase, in part labradorite, augite, iron ore, some olivine, apatite, and brown glass. The potassium is probably in the glass, as no potash mineral was observed. Analysis by H. N. Stokes, record No. 1645. P. R. C. 785. Hi. Augite latite, Table Mountain. Shoshonose. Called ‘‘basalt” in first edition. Contains labradorite, olivine, augite, and magnetite. Analysis by Hillebrand, record No. 1273. P. R. C. 724. I. Augite latite, Table Mountain, near Clover Meadow. Shoshonose. Contains labradorite, augite, olivine, magnetite, apatite, and glass. Analysis by George Steiger, record No. 1697. P. R. C. 763. 156 ANALYSES OF ROCKS AND MINERALS, 1880-1908. F G. H I. 59.43} 56.19 56. 78 16.68 | 16.76 16. 86 2.54 3.05 3. 56 3. 48 4.18 2.93 1.84 3.79 3.41 4.09 6. 53 6. 57 3.72 2. 53 3.19 5.04 4. 46 3. 48 +27 34 15 72 - 66 1.21 1.38 - 69 1.15 58 55 42 OB, Weise ecscllceiciewnee, trace -10 none trace | trace |........ .14 19 trace none | trace |........ ta tee varie [heros orev pz) 18 905 |eccesceeleeeecee. PEACE: | os ccninsnsicllarsisissisre.e 100. 04 | 100. 02 99. 89 J. Amphibole gabbro, Beaver Creek, Big Trees quadrangle. Hessose. Contains labradorite and amphibole, with a little pyrite and pyrrhotite. Analysis by H. N. Stokes, record No. 1752. K. Amphibole separated from J. Analysis by William Valentine, record No. 1733. L. Olivine gabbro, just east of south end of Phoenix reservoir. Corsose. Contains plagioclase, a few grains of alkali feldspar, augite, rhombic pyroxene, amphibole, olivine, magnetite, and iron sulphide, with a little secondary chlorite and epidote. Analysis by H. N. Stokes, record No. 1750. For description of J and K see Turner, Am. Jour. Sci., 4th ser., vol. 7, p. 294. IGNEOUS AND CRYSTALLINE ROCKS. 157 12. MARIPOSA COUNTY. Rocks collected by H. W. Turner, and partly described in his papers in 14th and 17th Ann. Additional data supplied by Turner. A. Soda granulite or aplite, about 4 miles west of Mariposa. Mariposose. See 17th Ann., pt. 1, p. 721. Contains plagioclase (albite?) and micropegmatite, with less epidote, quartz, sphene, and apatite. Analyses by W. F. Hillebrand, record No. 1461. P.R. C. 748. B. Micropegmatite, Agua Fria Creek. Lassenose. See 17th Ann., pt. 1, p. 691. Contains quartz, plagioclase, brown mica, epidote, and a little iron ore. Analysis by Hillebrand, No. 1461. P.R. C. 746. C. Soda granite porphyry, Merced River, below the mouth of the north fork. Las- senose. Published in 17th Ann. Contains feldspar, largely albite, hornblende, muscovite, abundant epidote, apatite, and a little iron ore. Analysis by George Steiger, record No. 1573. P. R. C. 774. D. Granite porphyry, about one-fourth of a mile north of Lake Tenaya, Yosemite National Park. Toscanose. See 14th and 17th Ann. Contains orthoclase, quartz, plagioclase, and biotite, with a little iron ore and sphene: Analysis by Hillebrand, record No. 1432. P. R. C. 726. E. Granite, west of Lake Tenaya, Yosemite National Park. Lassenose. See 14th and 17th Ann. Contains quartz, orthoclase, plagioclase, and biotite, with some hornblende, iron ore, sphene, and apatite. Analysis by Hillebrand, No. 1432. P.R. C. 725. > wo a o i HO PROP AS mes oo F. Amphibole-biotite granite, Nevada Falls trail, Yosemite Valley. Toscanose. Contains alkali feldspar, plagioclase, quartz, amphibole, biotite, magnetite, and apatite. G. Biotite granite, base of El Capitan, Yosemite Valley. Toscanose. Contains alkali feldspar, plagioclase, quartz, biotite, titanite, apatite, and iron oxides. H. Brown mica separated from G. Analyses F, G, and H by William Valentine, record Nos. 1732, 1733. Samples G and H are described by Turner in Am. Jour. Sci., 4th ser., vol. 7, p. 294. 158 ANALYSES OF ROCKS AND MINERALS, 1880-1908. F. G. EH. 66.83 | 71.08 35. 64 15.24 | 15.90 18. 62 2.73 - 62 5.54 1.66 1.31 14. 60 1.63 54 9.72 3.59 2. 60 90 3.10 3.54 - 38 4. 46 4.08 9, 22 none | none = 48 56 30 2.54 -54 +22 1.12 18 -10 20 04 £08 |eweeznes 10 +15 79 03 B02 | siziore ciety 11 - 04 trace trace | trace trace trace | trace }........ 025 |) OZ on ciate Eeisinsieast +26 I. Amphibole picrite, near Sequoia post-office, Yosemite National Park. Uval- dose. Collected by Turner, but not described. Analysis by George Steiger, record No. 1884. J. Amphibole-pyroxene rock, perknite, 3 miles northeast of Coulterville. SR. 2 of sec. 20f minnesotase. Described by Turmer in Jour. Geology, vol. 9, p.508. Analy- sis by George Steiger, record No. 1860. Contains pyroxene and amphibole, with a little quartz and pyrrhotite. K. Amphibole separated from quartz monzonite, Tioga road, southeast of Mount Hoffman. Sp. gr., 3.203, 2.15°. L. Mica separated from the same rock asI. Sp. gr., 3.05, 21°. Analyses K and L by W. F. Hillebrand, record No. 1774. Samples K and L aredescribed by Turner in Am. Jour. Sci., 4th ser., vol. 7, p. 294. 13.01 | 11.92 7 69 75 32 48 49 9,19 trace | none 03 290! || a= saec.sl emis scaciis S28 || seacisrseacast| sirrios cio stbialbictelere -04 05 sserowa at none trace none -51 ‘i fees seas 02 02 none | none 12 ep eater none | (?) ais Sas oiew trace |........ DONG | sissies el cacsisiasince storsia tts. aial - 06 7 100.06 | 100. 05 99.90 45 < 02 99 61 | 100,03 99. 83 IGNEOUS AND CRYSTALLINE ROCKS. 159 M. Quartz-mica diorite, Chowchilla River. Tonalose. See 17th Ann., pt. I, p. 691. Contains plagioclase, quartz, a little orthoclase (?), brown mica, hornblende, rather abundant apatite, a little iron ore; one zircon-like crystal was noted. Analysis by W. F. Hillebrand, record No. 1461. P. R. ©. 745. N. Quartz-mica diorite, Yaqui Creek. Tonalose. For the Educational Series of Rocks. Contains plagioclase, quartz, biotite, hornblende, a little pyroxene, iron ore and apatite. Analysis by George Steiger, record No. 1643. Described by Turner in Bull. 150, p. 339. O. Diabase, dike 14 miles northeast of Hornitos. Auvergnose. See 17th Ann., pt.1, p. 694. Contains plagioclase, partly labradorite, augite, brown hornblende, and iron ore. Analysis by Hillebrand, No. 1461. P.R.C. 750. P. Igneous rock, near Cathay Hill. Rossweinose. See 17th Ann., pt. 1, p. 694. Contains two minerals unidentified; neither is olivine. Analysis by Hillebrand, No. 1461. P.R. C. 749. H20 at 110°..... ‘ ster ae 5 29 - 06 +05 sO above 110% os: seaaqay sx tale casas Sy PPS RAGES vt BeegeRea aeeee ie 92 1.45 +95 2. 06 iO 8 Hs 55 -95 1.23 37 Q. Feldspathic mica schist, Chowchilla River. See 17th Ann., pt. 1, p. 691. Contains quartz, feldspar, biotite, muscovite, apatite, and specular iron. Analysis by W. F. Hillebrand, record No. 1461. P. R. C. 744. R. Andalusite hornfels, Yaqui Gulch. Principally quartz, andalusite, brown and white mica, black graphite-like grains, a little iron ore, and probably feldspar. Analy- sis by George Steiger, record No. 1643. Described by Turner in Bull. 150, p. 342. S. Andalusite schist, Chowchilla River. See 17th Ann., pt. 1, p. 691. Contains quartz, biotite, andalusite, sericite, a little muscovite, probably graphite, iron ore, a few garnets, and apparently chlorite. Analysis by Hillebrand, No. 1461. P.R.C. 743. T. Chiastolite schist, Yaqui Gulch. Contains chiastolite, sillimanite, brown mica, sericite (?), probably graphite, and clear grains which appear to be quartz and feldspar, Analysis by Steiger, No. 1643. Described by Turner in Bull. 150, p.342. P.R.C.135. U. Hornfels, Agua Fria Creek. See 17th Ann., pt. 1, p. 691. Contains quartz, brown mica, iron ore, and plagioclase. Analysis by Hillebrand, No. 1461. P. R.C. 747, 160 ANALYSES OF ROCKS AND MINERALS, 1880—1908. & aw wa 4 ct nS SNe ip, 27 03 46 68 23 89 29 35 -08 13. THE QUICKSILVER REGION. Rocks described by Becker in Mon. XIII. Analyses made by W. H. Melville in the San Francisco laboratory. With one exception (the serpentine from New Idria) all the rocks are from the distriets north of San Francisco. A. Pseudodiabase, near Mount St. Helena. Ornose. Contains augite, hornblende, oligoclase, albite, zoisite, ilmenite, leucoxene, and a little chlorite. P. R.C. 1459. B. Pseudodiabase, Sulphur Bank. Ornose. Contains oligoclase, a little quartz, pyroxene, hornblende, ilmenite, sphene, serpentine, and chiorite. P. R. C. 1460. C. Pseudodiorite, Knoxville. Rossweinose. Mainly actinolite, with a little white mica, chlorite, serpentine, sphene, rutile, and zircon. P. R. C. 1461. D. Glaucophane schist, Sulphur Bank. Mainly glaucophane and zoisite. Quartz, albite, muscovite, and sphene are also present. P.R. C. 1462. 99. 62 E. Andesitic obsidian, Clear Lake. Liparose. Shows grains of plagioclase, augite, and hypersthene. Sp. gr., 2.391. P. R. C. 1463. F. Andesite (asperite), Clear Lake. Yellowstonose. Contains pyroxene, plagio- clase, magnetite, and sometimes biotite. Pyroxene mostly rhombic. Sp. gr., 2.664. P.R. C. 1464. G. Obsidian, south of Borax Lake. Varingose. Sp. gr., 2,390. P. R. C. 1465. H. Basalt, south of Burns Valley. Andose. Rich in olivine, with a microlitic groundmass of plagioclase and augite. Sp. gr., 2.380. P. R. C. 1466. I. Ordinary basalt, Knoxville. P. BR. C. 1467. IGNEOUS AND CRYSTALLINE ROCKS. 161 100. 45 | 100.25 | 100.62 | 99.92) 100.13 J. Light-green marmolitic serpentine, New Idria. P.R. C. 1468. K. Black serpentine, Sulphur Bank. P. R. C. 1469. L. Light-green serpentine, Sulphur Bank. P. R. |. 1470. 14, MOUNT DIABLO. Described by Turner and Melville in Bull. Geol. Soc. America, vol. 2, pp. 383-414. Analyses by W. H. Melville. Those with record numbers were made in the Washing- ton laboratory; the others were made in the laboratory at San Francisco. A. Diabase, Mitchell Canyon. Auvergnose. Composed of augite, plagioclase, and ilmenite, with uralite and chlorite secondary. B. The same rock, partly altered and partly uralitic. Ornose. Called ‘‘diabase- diorite” by Turner. C. Pyroxenite, near Bagley Creek. Cecilose. Composed of bronzite and diallage. Equivalent to the websterite of North Carolina. P. R. C. 735. D. Glaucophane schist, Pine Canyon. Contains rumerous cinnamon garnets. A, B, and C have the record No. 1247. 162 ANALYSES OF ROCKS AND MINERALS, 1880-1908. E. Crystalline gabbro, Bagley Creek. Kedabekose. Contains plagioclase and diallage. Record No. 1166. F. Shaly gabbro. Friable, containing carbonates and sulphates. Somewhat resembles serpentine. : G. Shaly gabbro, like F, much resembling a true serpentine. According to Turner, F and G are merely weathered layers of the gabbro. The following analyses are of serpentines derived from a peridotite-pyroxenite dike; H. Almost black. Possibly derived from adjacent shale. I. Almost black. Derived from pyroxenite. J. Bastite. Derived from pyroxenite. Record No. 1166. K. Friable serpentine. H I. J. K SiOz 40.50 | 36.57} 36.96 78 +95 39 4.01 7.29 5.00 FeO 2.04 37 2.34 MgO 37.43 | 40.27 33, 84 39 14 3.81 28 31 34 Tio at 166 lg gar | oa] 216 20 a Peers Jesse anette sd ang spate, ie , 9 Ks H20 above 100° a 9.56 | 10.94] 12.43 14. 02 trace | trace |........ 02 trace Al 33 78 trace «ll 31 trace oBe 13 -10 09 100.00 | 99.99 | 100.01 99. 89 Accidental organic matter was deducted from analyses H and I, with subsequent recalculation of the data to 100 per cent. L. Serpentine. M. Talclike yellowish-green serpentine. N. Weathered serpentine. O. Olive colored, probably serpentine. Samples H, I, and J are from near Bagley Creek; K, L, M, and N from near Arroyo del Cerro; O from Ferguson ravine. M and O carry considerable chromite, IGNEOUS AND CRYSTALLINE ROCKS. 1638 41 44 22 KO.... is a trace |........ 16 H20 at 100°. ..... Lunveinleteurieia weunlcalchea ne nongsmtdetiiy sanmdislGamenl : -44 3.32 . 39 He BDOVE! 100? 24 cereractasunenadt a setae sage ssheewiederaes aereeeear 15.72 | 12.40} 12.51 20. 43 BO s:,: vsasoscagigians areuemens at a4 Aocereeen se eee GEO sh cactrn die ciachassatig bioreecinemia ae ae ce Stee Me NiO. MnO ssaccaceiaisaee focirtieniieah an ake keeayseS ohind BSOgscraasecces 99.56 | 100.70 | 101.06 | 100.15 15. MISCELLANEOUS ROCKS. A. Rhyolitic obsidian, Medicine Lake, Modoc County. Toscanose. Collected by J. 8. Diller, who reports it to be a banded obsidian, containing a few minute feldspar crystals. The banding is due to a multitude of trichites. Analysis by L. G. Eakins, record No. 1072. B. Rhyolite, Hyampom, south fork of Trinity River, Trinity County. Tehamose. Almost wholly made up of particles of clear glass. Collected and described by Diller. Analysis by George Steiger, record No. 1427. P. R. C. 1455. C. Tuff from Redding Creek basin, Trinity County. Collected by J. 8. Diller. Analysis by E. T. Allen, record No. 2020. D. Diabase porphyrite, one-half mile west of Browns Valley, Yuba County. Auvergnose. Collected and described by W. Lindgren. Contains augite, plagioclase, magnetite, chlorite, and epidote. Analysis by W. I. Hillebrand, record No. 1419. E. Amphibolitic schist, 1 mile northeast of Browns Valley, Yuba County. Col- lected and described by W. Lindgren. From metamorphosis of C. Contains chiefly green hornblende and feldspar. Analysis by Hillebrand, No. 1419. Ko H;0 at 100°........ H20 above 100° F. Basalt, base of a lava flow, east of the head of the San Joaquin River, Madera County. Andose. Description supplied by Turner. Hitherto unpublished. Con- tains pyroxene, partly augite, plagioclase, olivine, and iron ores, Analysis by W. F, Hillebrand, record No, 1767, 164 ANALYSES OF ROCKS AND MINERALS, 1880-1908. G. Olivine basalt, west peak of the Dardanelles, Alpine County. Hessose. De- scribed by Ransome in Bull. 89. Contains olivine, largely altered to iddingsite, pla- gioclase, serpentine, and augite. Analysis by George Steiger, record No. 1697. H. Mica separated from quartz monzonite, near Bloods station, Alpine County. Described by Turner in Am. Jour. Sci., 4th ser., vol. 7, p. 294. Analysis by William Valentine, record No. 1736. I. Typical diabase, 1 mile north of Bella Vista ranch houses, San Mateo County. Andose. Contains plagioclase, augite, olivine, apatite, ilmenite, and magnetite, with secondary serpentine, chlorite, iron ores, calcite, analcite, and natrolite. P. R. C. 1473. J. Diabase, basaltic facies, Mendigo Hill, San Mateo County. Andose. Contains plagioclase, augite, olivine, ilmenite, and magnetite, with secondary calcite, serpen- tine, chlorite, iddingsite, iron oxides, analcite, and natrolite. P. R. C. 1603. Rocks I and J are described by Haehl and Arnold in Proc. Am. Philos. Soc., vol. 43, p.16. Analyses by E. T. Allen, record No. 1958. K. Bronzite-olivine aleutite, south end of Panamint Range. Andose. Contains plagioclase, bronzite, and olivine in a glassy to microcrystalline groundmass carrying much magnetite. L. Hornblende-quartz diorite, Fremont Peak, Mohave Desert. Contains horn- blende, plagioclase, subordinate quartz, and apatite, with secondary muscovite and epidote. M. Alaskite, Fremont Peak. Toscanose-tehamose. Essential minerals, quartz and orthoclase. Rocks K, L, M collected and described by J. E. Spurr. Hitherto unpublished. Analyses by W. F. Hillebrand, record No. 1881. IGNEOUS AND CRYSTALLINE ROCKS. 165 I J K. L. M SiO, 49.60 | 53.98] 52.55 76. 26 AlkOs. 16.56 | 17.86 | 17.61 13. 43 Fe20s, 4.28 4.61 4.24 11 FeO. 4.44 2:27 4.98 06 MgO 5.38 3.30 4.17 04 CaO. 9. 22 7.55 8. 02 1.06 NazO 3.31 4.19 3.4L 2.95 Ka 1.25 2.59 1.49 5.44 H20 at 105°..... 1.64 1.44 56 25 19 H20 above 105° 3.09 2.58 - 50 2.13 51 iOz.. 1.33 1. 86 1.10 86 07 DIOR a ceintcranepiaes SiS te al auiernls us SCAT RA wk Sue GeO ainse ele Salle Sees easel PoSicennate trace? | trace? trace COssesccmieesiecaartestaaein ds eee oheaias S55 bow LIE eae MHeReS Ra Oegasl| a meee 21 | none none PyOss iso. ccisinas sosem sesame sone evmen sd MEAGRE ine Aeee RISE +18 -30 61 36 trace BO fie coccnscinscasce nmr mcnmrnsnaais sOse memes He Sisuicisecersenee Tse 08 17 LE? | sasetecupece| seeicaiviens MRS EEA Rem etecters Sei timalebibts side accieidiaRtalonsieteis pete ciieigenemiatersice Selected a ctelas of sidtieiees 01 02 trace Cr2O3. trace 08) ecccars noaemosl beemeser no. trace 08 +13 23 none SEO’. 5 see ceeinees pew cates Task eceeen as sexe iewerieaiad Seaecleestecsl ledeeee. .14 02 03 BaO. 02 05 - 28 04 10 Tila Oss sissesoresrsnsaiarsiciaisieis sjxiereianelsig ¥Gia gus wiapiSlncad Giseis nie atin ote che eugene | eee canes oa teeiat trace | none trace 99.91 | 100.55 | 100.06 | 100.38 | 100.25 N. Scoriaceous rhyolite, Mono Craters, south of Mono Lake. Liparose. Described by Russell in 8th Ann., pt. 1, p. 380. Analysis by T. M. Chatard, record No. 36. O. Obsidian, Mono Lake. Liparose. Analysis by W. H. Melville, record No. 1346. Described by Lindgren in Bull. 150, p. 149. P.R. C. 60. P. Pumice, Mono Lake. Toscanose. Analysis by Melville, No. 1346. Described by Lindgren in Bull. 150, p. 148. P. R.C. 59. Q. Volcanic ash, east shore of Owens Lake. Collected and analyzed by Chatard, record No. 783. 22 56 3. 43 1.25 1.99 67 31 77 2. 22 81 1.63 1.05 4.00 4.74 75 K,0 H20 at 110°. . H20 above 11 a \ 2.06 2. 50 TO. <.ccrp ue osdan sasuceanncmsaers var acs naaws ss eemunesnTesESesesemedee|eaeune seas eeeneledesaenly PSO si wxte neces ater xe ee store ns Ld eeONDe sat seems Smee [Pease alee seca secede 27 MYO sectrxnecceaeaies wane veces eels eae PEATEs cheat eens pr tise omicicmune a omens aeratigie |e neaaaae 23 CaCO aiene. cinis NaCl, soluble....- 1.45 NazSO,, soluble. . ze = 80 INGg6 Oa SONIDIG cic. ccrorspuie ei eatticereeeicisites Hennes @esinieieies aeeisMainiessicinese sts Lookin 2.09 99.98 | 99.81 | 99.93} 100.21 R. Soda syenite, from near Coalinga, Fresno County. Description supplied by Ralph Arnold. Contains plagioclase, hornblende, biotite, apatite, zircon, and iron ore, with secondary calcite, analcite, egirite, and white mica. Analysis by W. F. Hillebrand, record No. 2366. S. Quartz-augite rock, Hiriart Hill, Pala, San Diego County. Mainly quartz and augite. Collected and analyzed by W. T. Schaller, record No. 2309. T. Matrix of dumortierite, near Dehesa, San Diego County. Description and analysis, No. 2120, by Schaller. Consists chiefly of quartz, with andalusite or sil- limanite. For details see Bull. 262, p. 96. 15619—Bull. 419—10—_12 166 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 100.13 | 100.04 OREGON. 1. BASALT, MOUNT THIELSEN. Partly described by Diller in Am. Jour. Sci., 3d ser., vol. 28, p. 257. A hypersthene basalt containing hypersthene, olivine, feldspar, and magnetite. In the printed paper only the analysis of the groundmass and the fulgurite formed in it are given, A. Hypersthene basalt. B. Pyroxene. C, D. Feldspars. E. Groundmass. F. A fulgurite, or lightning tube. Analyses A and F by F. W. Clarke, record Nos. 108, 105; B, C, D, and E by T.M. Chatard, record Nos. 135, 133, 134, 128. These analyses were made early in the history of the laboratory and are by no means complete. 99.39 | 98.11 | 100.00 | 100.00 | 100. 23 98. 85 Iron oxides not separated. Analyses B, C, D, and F made on very small quantities of material. Cand D were analyzed by the hydrofluoric-acid method, and the silica was determined by difference. 2. RIDDLES QUADRANGLE. A. Peridotite, the matrix of the silicate nickel ores. Described by Diller and Clarke in Bull. 60, p. 21. The rock, which may be classed as saxonite, consists essen- tially of olivine and enstatite, with a little chromite and magnetite. Olivine pre- dominates, and the enstatite forms less than one-third of the mass. Quartz, serpen- tine, and genthite are present as alteration products. IGNEOUS AND CRYSTALLINE ROCKS. 167 B. Olivine separated from A. Analyses A, B, by F. W. Clarke, record Nos. 811, 814. ©. Dacite porphyry, sec. 5, T. 30S., R. 6 W. D. Granodiorite, sec. 26, T. 308., R. 3 W. E. Intermediate rock, between greenstone and granodiorite, Evans Creek, near mouth of Sykes Creek. F. Augite andesite, south bank Umpqua River, ? mile west of Days Creek. Rocks C to F collected by G. F. Kay. Analyses by G. Steiger, record No. 2354. A. B. Cc. Dz. E. F. 99.80 | 99.36} 99.97 | 100.17 i 100. 01 @ Loss on ignition. The four following rocks were also collected by Kay. Analyses by Steiger, record No. 2349: G. Diabasic greenstone, Sec. 2, T. 30S., R. 6 W. H. Basaltic greenstone, Sec. 23, T. 31S., R. 6 W. I. Gabbroic greenstone, Sec. 2, T. 348., R. 6 W. J. Dioritic greenstone, Sec. 29, T. 348., R. 6 W. ‘ ZrOz absent. 168 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 3. CRATER LAKE. Rocks collected by J. S. Diller. All except the last one in the series are described by H. B. Patton in P. P.3. Analyses A to N, inclusive, by H. N. Stokes, record Nos. 1671, 1953. A. Vitrophyric rhyolite, south edge of Llao Rock flow. Lassenose. Contains plagio- clase, hypersthene, hornblende, and apatite in a glassy groundmass crowded with augite microlites. P.R.C. 1814. B. Streaked rhyolite, near ‘‘Wine Glass” Grotto Cove. Lassenose. Contains plagio- clase, hypersthene, hornblende, and magnetite, with biack glass. A few small inclu- sions of basalt and hypersthene andesite. P. R. C. 1316. ‘ C. Rhyolite, small dike immediately below Llao Rock. Lassenose. Contains plagioclase, hornblende, hypersthene, and magnetite, in a glassy groundmass crowded with microlites of feldspar and augite. P. R. C. 1317. D. Rhyolite, water’s edge, head of Cleetwood Cove. Lassenose. Contains plagio- clase, hypersthene, brown hornblende, and magnetite, in a feldspathic groundmass of trachytic type. P.R.C. 1315. E. Hypersthene-augite andesite, large dike transsecting the northwestern portion of the crater rim. Tonalose. Contains plagioclase, hypersthene, augite, and magnet- ite in a groundmass having a moderate amount of glass. P. R. C. 1313. F. Hypersthene-augite andesite, west edge of Wizard Island. Tonalose. Same mineralsas E. P. R. C. 1309. A B Cc D. E F Si Og: eee aeseesasadcadd sof otemditandeataass nee 70.77 | 68.17] 71.78) 70.10} 60.09} 59.39 MISO Bc Sencrnsnrcinceratne mee meee net anaes Rae acim anmee 14.83 | 15.60] 14.53} 15.18] 17.85 18. 45 O98 2 scorer sraxrsusis nd setaneeemeeuisenastinrtektoresacerees 1.35 2.31 1,28 1.78 2. 03 1.79 BOO 53 perdaisanyavacdbisitsise.c yemmenuiiatienesaiermamaaete 1. 25 94 1.02 1.09 8. 45 3.90 Mg Olsens ceecuhe 64 1.02 - 48 74 3.50 3.13 CaO... 2.12 2.76 1.59 2.27 6. 28 6,29 Na2O 5.07 5.15 5. 08 5.15 4.17 4,29 KO. 2. 68 2. 46 2. 84 2. 58 1.31 1,29 HO at 110°. . 2 07 09 - 06 10 Assumed. GUATEMALA. Volcanic dust from the volcano Santa Maria, collected on deck of steamer Luxor, 60 miles distant in San Benito Harbor, October 25, 1902. Yellowstonose. Analysis by E. T. Allen, record No. 2011. SiOs... 36 Al2O3.. +73 Fe203.. 49 FeO... 18 -27 100. 33 Traces of Cr203, MnO, and BaO are present. COs is absent. WEST INDIES. Volcanic ejectamenta from Mont Pelée, Martinique, and La Soufriére, St. Vincent, eruptions of May, 1902. See Diller, Nat. Geog. Mag., vol. 13, p. 285. Also Diller and Steiger, Science, vol. 15, p. 947. A. Pumice, Mont Pelée, eruption of May 8. Bandose-tonalose. Hypersthene andesite, containing plagioclase, hypersthene, and magnetite in a vesicular, glassy groundmass. . B. Sand, same eruption as A, collected on deck of the steamer Roddam after its arrival at Santa Lucia. Tonalose-bandose. C. Dust, Mont Pelée, eruption of May 20. Tonalose. Collected on deck of steamer Potomac in harbor at Fort de France. Band C resemble A mineralogically. D. Volcanic dust from about 1 mile north of Georgetown, St. Vincent. Bandose. Collected by E, 0, Hovey and not described in the articles cited above. 180 ANALYSES OF ROCKS AND MINERALS, 1880-1908. E. Pumice from La Soufriére. Bandose. Collected by R. T. Hill. Hypersthene andesite containing plagioclase, hypersthene, augite, olivine, and magnetite. (Diller.) F. Dust from La Soufriére. Bandose-placerose. Collected on steamer Coya, at sea, about 275 miles southeast of St. Vincent, May 7, 1902. Contains feldspars, pyroxenes, magnetite, and possibly other minerals. Contained 0.57 per cent of soluble salts. Analyses A to D by W. F. Hillebrand, record No. 1991. Eand F by George Steiger, record Nos. 1984, 1989. A B Cc D. E Fi 61. 07 60.01 | 63.23 | 55.08 | 55.64 57. 62 17.55 17.54 | 16.73 | 18.00} 18.21 19. 76 2.13 2. 88 2.58 2. 46 3. 63 3. 43 4.13 4.30 3.12 4.57 4. 83 3.90 2. 26 2.76 1.84 3.34 3. 48 1.82 6. 28 6. 80 6. 01 7.79 8.14 6. 45 3.50 3. 41 3.71 3. 48 3. 55 3. 87 - 98 -89 1.11 - 65 - 58 71 +23 -10 elt - 66 20 -41 1.37 - 30 48 1.39 54 59 47 ~ 45 - 40 98 87 trace? | trace? | trace? Cibo NV ytajemree ASS saycie 15 ol 15 -17 11 17 saanrescil| seiciicese|secmmear 24] none 29 016 | trace | trace }--.... ae «04 11 21 23 -18 21 19 08 02 03 .03 | trace OB cic cicsese trace trace | trace | trace |.......-.|........ 100.366 | 99.85 | 99.74 | 99.75 | 100.15 | 100.08 2 Soluble in water; CaO, 0.20; NaO, 0.08; SOs, 0.29, and a trace of Cl. COz, Cl, NiO, SrO absent, except a trace of Clin F. BRAZIL. A kyanitic schist from Serra do Gigante, near Diamantina, was analyzed at the request of Prof. 0. A. Derby, who describes the rock in Am. Jour. Sci., 4th ser., vol.7, p. 343. Analysis by Hillebrand, record No. 1783. Contains kyanite, chlorite, sericite, quartz, and rutile. A. Bulk analysis of the schist. B. Portion soluble in hydrochloric acid. C. Portion soluble in strong sulphuric acid. D. Residue insoluble in sulphuric acid. The bracketed figures are deduced from other columns than the one in which they appear. 10.78 | 14.76 re a 1.78] | [2.24] | none 3.21 4.02 none [ none 42.64 | 56. 66 IGNEOUS AND CRYSTALLINE ROCKS. 181 TASMANIA. Two analyses of so-called ‘volcanic bombs” or ‘‘buttons” were made by W. F. Hille- . brand, record No. 2097, at the request of W. H. Twelvetrees, of Launceston, Tasmania. These curious forms of volcanic glass have every appearance of artificiality, but are said to be found under such conditions and in so many localities that the idea of their human origin is precluded. A paper on the subject by R. H. Walcott may be found in Proc. Royal Soc. Victoria, vol. 11, p. 23, 1898. A. From Upper Weld tindrift. Almerose. Analysis incomplete because of insufli- cient material. Sp. gr., 2.454 at 18.5°. B. From Pieman. J. 3.4.8. Sp. gr., 2.428 at 22° 15619—Bull. 419—10——_13 ANALYSES OF SANDSTONES, CHERTS, AND SINTERS. SANDSTONES FROM EASTERN STATES. A. Calciferous sandstone, New Sweden, Maine. Described by H. E. Gregory in Bull. 165. Analysis by W. F. Hillebrand, record No. 1795. Contains quartz, calcite, feldspar, magnetite, muscovite, and siderite. B. Brown sandstone, Hummelstown, Pennsylvania. Analysis by E. A. Schneider, record No. 1280. Described by Diller in Bull. 150, p. 77. P. R. C. 14. C. Triassic sandstone from the Jaittelle quarry, near Hancock, Maryland. Hard, compact, brown. Analysis by F. W, Clarke, record No. 613. ASO Nabi. CN eevee rere aaa a eRe RENN aioe SPE Biers RARER SS Tee nel|t wcemGaaees aneeiais 88. 68 SANDSTONES FROM MICHIGAN, WISCONSIN, AND IOWA. A. Yellow sandstone, Stony Point, Michigan. Analysis by F. W. Clarke, record No. 213. B. Potsdam sandstone, Ablemans, Sauk County, Wisconsin. Described by Diller in Bull. 150, p. 80. Analysis by Schneider, record No, 1280. P. R.C. 15. C. From Boscobel, Wisconsin. D. From Beetown, Wisconsin. Analysis C, D, by G. Steiger, record No. 2227. E. From Springdale Station, Sioux City, Iowa. Analysis by Steiger, No. 2295. Rocks C, D, E are St. Peter sandstone, described as ‘‘glass sands” by E. F. Burchard in Bull. 285, p. 459, and Bull. 315, p. 377. Partial analyses only. 182 SANDSTONES. 1838 SANDSTONES FROM OHIO. A. Blue sandstone from near Cleveland. Analysis by T. M. Chatard, record No. 214. B. Sandstone from Berea. Analysis by L. G. Eakins, record No. 914. C, D, E. Three samples of the ‘‘Peebles-Henley sandstone,’”’ from Portsmouth. Analyses by H. N. Stokes, record No. 1239. Alkalies, etc., undetermined. 100.38 | 100.05 | 97.74 | 98.06 Insoluble tin, FIC ceeens es ae veicteaistsis usiveapenreensce iss acetate 97450 | steccstesses oe | 96.90 a . on 2 SANDSTONES FROM KENTUCKY, MISSISSIPPI, MISSOURI, AND ARKANSAS. A. Carboniferous sandstone adjoining the peridotite dike of Elliott County, Ken- tucky. See Diller, Am. Jour. Sci., 3d ser., vol. 32, p. 125. Analysis by T. M. Chat- ard, record No. 354. B. Fine-grained, fissile sandstone. Same locality and reference as A. C. ‘Glass sand,’’ near Iuka, Mississippi. Received from E. ('. Eckel. Analysis by G. Steiger, record No. 2268. D. From Jackson, Missouri. E. From Versailles, Missouri. F. From Everton, Arkansas. Rocks D, E, F are St. Peter sandstones, described by Burchard in Bull. 285, p. 459, and Bull. 315, p. 377. Analyses by Steiger, Nos. 2227, 2295. SANDSTONES FROM KANSAS. St. Peter sandstones described as ‘“‘glass sands” by E. F. Burchard in Bull. 285, p.459, and Bull. 315, p. 377. Analyses by G. Steiger, record Nos, 2222, 2227, 2295, Partial only. A, B, C, D, from Fredonia. E, from Neodesha. F, from Havana. 184 ANALYSES OF ROCKS AND MINERALS, 1880-1908. G, from Caney. H, I, from Niotaze. J, K, L, from SE. } sec. 13, T. 28 8., R. 12 E. M, from near Fall River station. 73 -81 96 35 - 26 80 05 06 04 18 08 13 80 81 73 99.92 | 100. 04 99. 94 a Total Fe. SANDSTONES FROM COLORADO, UTAH, AND ARIZONA. A. Yellow sandstone, Armejo quarry, Colorado. Analysis, partial, by T. M. Chatard, record No. 289. B. Sandstone, Robinson mine, Summit County, Colorado. Analysis by L. G. Eakins, made in the Denver laboratory, partial. ('. Sandstone from the Logan mine, Rico district, Colorado. Consists mainly of quartz and sericite. D. Altered sandstone, in contact with C. Same constituents, plus limonite, anglesite, and a hydrous magnesian mineral. Analyses C, D, by W. F. Hillebrand, record No. 1914. Described by Ransome, 22d Ann., pt. 2, p. 287. E. Banded sandstone, Peoa, Utah. Described by Diller in Bull. 150, p. 80. Analysis by Schneider, record No. 1280. P. R. C. 16. F. Brown sandstone, Flagstaff, Arizona. Analysis by T. M. Chatard, record No. 1144, @ Silica and insoluble matter. b Loss on ignition. ¢ Calculated to satisfy bases. SANDSTONES. 185 SANDSTONES FROM CALIFORNIA. 1, MOUNT DIABLO. Described by Turner and Melville in Bull. Geol. Soc. America, vol. 2, pp. 383-414. Analyses made by W. H. Melville in the San Francisco laboratory. A. Upper Cretaceous, Chico sandstone. Light brown, finely granular, carrying grains of mica and feldspar. B. Lower Cretaceous, Neocomian sandstone. Hard, granular, greenish. From headwaters of Bagley Creek. ©. Miocene sandstone. Granular, particles light brown and black, friable. From near Wall Point. D. Chico sandstone. Greenish gray, compact, crystalline. r iS B c. D BIO = cincacsiecs sews damian «nv a Restasnainin ceaislnae olan pieces Melee eerie Se 73.71 | 56.84] 44.54 | 36.93 NGO ga crcsin auton ausietiatewteend ah atealecicmyesa aarsoeeceptie aia dra haneetates dancin aietnen ats 10.40 | 11.37 | 12.63 7.22 Reg Osccirie oc cine ayoeceawen aa elecahs vy SRSEDeEN we Soa REA Nes SEE eneR EEE 3.89} 1.46] 2.50 1.59 POO es scceas oy iearmsianes Sroarnacenss sngoeincan ah aaWAsauenes tasers 1.88 | 4.95] 3.08 2.95 MB Oo sicienseks sche eeaceeBe tS II ANS SOO Seatahansinnans Us gaeapaltea ee uc eecaion esos 1.62] 3.10] 5.55 2.34 CBO ses. sscine atosiaasentayanse sles bitin sageialeee dteyaceesis ead Maasai mocete nutans 96| 7.62) 14.65] 29.34 INO apca cect ealat om Oot ona AF SON aaa CORE ees nk eatoenar' 3.48 | 3.26] 3.35 2.94 HO at 66 ogee cena 108 ia is 3 20 al PS ps rarnis am carerctenctees aes Soivicadapcbisis ai Gaeeadeusha easier Niaiees a aetna > F ~ 45 le, m HRsO Bb OVO ST 00 ccs Siecd dnp sc vesioeenieis oe Se a kloan GAs Gnastorene tod Hmeeteecraere 2.60} 3.34] 2.25 3.45 PHO sisesiorteasxctdagadincge gine taconfan mast oe. tighggm mile 2 Oaatelwemngh "year none 10 29 -16 Mi Ovo sien eeniees cocedincenaemoosainanens 1 As nine a uewn cieeaeeneneceiae ol (22 44 ay CO a vesaceiawceuies aiteeceniad oy Nees BE ea ep RAE AGREES re SSN none 5.10 7.76 @11.30 100.76 | 99.67) 99.84) 100.00 a @ CO: determined by difference. Traces of organic matter are found in all four sandstones, but were not determined. 2. SHASTA COUNTY. Described by J. 8. Diller in Bull. Geol. Soc. America, vol. 1, p. 411. The rock is made up of quartz, feldspar, and biotite, with a calcite cement. Serpentine, sphene, mmagnetite, and zircon also occur in it, but are less common. A. From Salt Creek, one-half mile above McNett’s. B. One and one-fourth miles below Ono Bridge, north fork of Cottonwood. C, D. Three-fourths of a mile below John Allen’s, Dry Creek. E. From John Allen’s, Dry Creek. Analyses A and B by T. M. Chatard, record No. 1106; ©, D, and E, by J. E. Whit- field, record Nos. 972,-973. 78 AB! | edicjassiciced [ews eee leecemece 1.78 3.27 2.63 3.10 1.60 24 47 -70 | trace trace 14 13 | trace 08 10 29 26} trace | trace 1.53 12.73 | 10.36 4. 65 5.05 9.05 drergeareisiaallste signees trace 27 10 casiewagipeaam estes trace | trace 72 100.11 | 99.92 | 100.45 | 100.46 | 100.31 186 ANALYSES OF ROCKS AND MINERALS, 1880-1908. The following bedded sandstones of the same region are also described: F. From middle fork of Cottonwood, 1 mile above Miller’s. G. Top of cascade, 14 miles up Byron Creek from north fork of Cottonwood. H. Two and one-half miles above John Allen’s, Dry Creek. Analyses F and G by Chatard, record No. 1106; H by Whitfield, record No. 974. 3. SULPHUR BANK. Described by Becker in Mon. XIII, p. 92. Analysis made by Melville in the San Francisco laboratory. An altered sandstone, showing grains of quartz, plagioclase, and orthoclase. CHERT. From the lead-zine region of southwestern Missouri and its extension into Kansas. Collected by W. P. Jenney. . Unaltered chert, East Hollow, Belleville, Jasper County, Missouri. . Partly altered, same locality. Altered to ‘‘cotton rock,’’ same locality. . From the Surprise mine, Joplin, Missouri. . Blue chert, unaltered, Bonanza shaft, Galena, Kansas. . Same locality. . Altered, same locality. . Jasperite, Joplin, Missouri. I. Jasperite, Galena, Kansas. Analyses A toG by E. A. Schneider, record No. 1205; H and I by L. G. Eakins, record No. 1208. Hote vom> A. B. Cc. D. E. F. G. H. t BIOs.) coves scrtsrencaseaxtgnes Fé 98.92 | 98.71 | 99.46 | 99.23 | 98.60] 99.13 | 95.77 97.33 AlsO3, FesOu 83 -48 43 29 22 52 -16 1.84 1.89 PO iss axe - 02 -02} trace | trace | trace -O1 24 09 CaO... 03 03 -04 02 -10| trace 54 ll Ignition -42 - 50 34 - 50 -40 -20 1.17 77 99.87 | 99.69 | 100.13} 99.97 | 99.62) 99.50] 99.56} 100.19 SANDSTONES, CHERTS, AND SINTERS. 187 * SILICEOUS SINTERS. From the Yellowstone National Park and similar localities. Analyses A to E by J. E. Whitfield, record Nos. 97, 100, 707, 708, and 861. Discussed by Weed in 9th Ann., p. 619. A. Dried siliceous jelly from Emerald Spring, Upper Basin. B. Sinter from Solitary Spring, Upper Basin. C. Grayish sinter from margin of Splendid Geyser. D. Compact sinter from Old Faithful Geyser. E. From Asta Spring, Hillside Group. Sp. gr., 1.7122. A. B. Cy D. E. 93.37 | 93.88 1.16 1.73 trace 14 05 07 29 +25 ll - 28 02 . 23 4.17 3.37 - 08 18 231 - 20 COP PaNit.. 5 davecemates aecamemeeunes enetaweouigt shceeenans oeeete wfBi | eaerecan iy OF SATU Cy eye cces vaca acs 2s SAS Sees Sheena Renae Sees Se BE Pees OY | dehoniare esos sseenteadleceseees 100. 41 | 100.33 | 100.02 | 99.92 100. 09 Analyses F to O, are all of Yellowstone Park deposits. Record Nos. 236, 703, 697, 706, 698, 709, 812, 866, and 1012. Analysis N by T. M. Chatard; all the others by J. E. Whitfield. Samples collected by W. H. Weed. F. Geyserite incrustation, Spring No. 8, Giant Group, Upper Basin. G. Incrustation from margin of crater, Surprise Geyser. H. Deposits from Coral Spring, Norris Basin. I. Sediment, Vixen Geyser. J. Deposit from Artemisia Geyser. K. Opal deposit, Norris Basin. L. Incrustation, Excelsior Geyser Basin. Bottom layer, compact, opaline. M. Same as L, top layer, sintery. N. Incrustation, platform near Union Geyser. O. Black coating, the ‘‘Minute Man,’’ Norris Basin. @Tncludes H of organic matter. b Whether as S or SO3 was not determined. 188 ANALYSES OF ROCKS AND MINERALS, 1880-1908, K. | L. M. N. oO. STO as, Seco tasisis, ane ceaiaeiayeleminainic od cioiaiesa le wine aa MaetemeRNe eS 93.60 | 90.85 | 94.40} 90.28 85. 08 AO sedis ed aa-nthmaace meted 1.06 83 \ 79 2B | eee Res Os Ass atatatsotetim beens trace ii . trace 2.65 GO re cits taraisgeks Seorperten eeahlee Se - 50 46 none 30 1.67 Mig Oss stesectricionsisanisiiecmemrassicgis trace | trace | none -07 trace ane gh set Se acteietone emamecienite eg Geass eeee ants nee anna SOMBE1LOS wece nce cece H20 above 105° Hf 471 } Sssauik bist ccaneoosestcaau tes caves beReeGen Yeemeeteenein eens trace 99.87 | 100.04 | 100.21 | 99.28 | 100.07 a Loss on ignition. Water and organic matter. The following foreign sinters were analyzed for comparison with the Yellowstone Park specimens: P, Q, R. Three samples of sinter from Rotorua, New Zealand. Analyses by J. E. Whitfield, record No. 998. Discussed by Weed in 9th Ann., p. 619. S. Sinter from Mount Morgan gold mine, Queensland. Described by Weed in Am. Jour. Sci., 3d ser., vol. 42, p. 165. Analysis by E. A. Schneider, record No. 1254. ANALYSES OF CARBONATE ROCKS. MAINE AND VERMONT. A. Limestone, Islesboro, Maine. Collected by George Otis Smith. Analysis by W. T. Schaller, record No. 2139. Partial only; CO, calculated to satisfy bases. B. White marble, Rutland, Vermont. Analysis by L. G. Eakins, record No. 1213. C. The portion of A insoluble in dilute hydrochloric acid. Same analyst and number. D. Dolomite, Green Peak quarry, Dorset, Vermont. Analysis by George Steiger, record No. 1938. Described by Dale in Bull. 195. H20 at 105°. ... H:20 above 105°. . CO: MASSACHUSETTS. A. White marble, Lee. Analysis by E. A. Schneider, record No. 1279. Described by Diller in Bull. 150, p. 299. P.R.C. 116. B. Limestone, Lee. Collected by B. K. Emerson. From cut on west side of rail- road. Analysis by George Steiger, record No. 1654. C. Dolomite, Charlemont. Collected by Emerson. Analysis by Eakins, record No. 1343. D. Dolomite, Webster. Collected by Emerson. Analysis by H. N. Stokes, record No. 1634. 190 ANALYSES OF ROCKS AND MINERALS, 1880-1908. NEW YORK. A. Dolomite marble, New York Quarry Company, Tuckahoe, Westchester County, Analysis by W. F. Hillebrand, record No. 746. B. Hydraulic cement rock, Akron. Analysis by George Steiger, record No Described by Diller in Bull. 150. . 1655. PENNSYLVANIA. A. Compact gray limestone, Greason.- Described by Diller in Bull. 150. Analysis by E. A. Schneider, record No. 1279. B. Limestone, quarry on south side of Jordan Creek, near Jordan Bridge, South Whitehall. C. Quartzose dolomite, same locality as B. D. Hydraulic limestone, Atlas Cement Company’s quarry, Whitehall. Analyses B, C, D, by W. F. Hillebrand, record No. 2016. Samples collected by T. N. Dale. 99.08 | 98.23 96.81 MARYLAND. A. Dolomite marble, Cockeysville. Analysis by E. A. Schneider, No. 1279. P, Ri G, 1%, CARBONATE ROCKS. 191 B. An earlier sample of D. Analysis by J. E. Whitfield, record No. 827. P. R. ©. 117. Described by Diller in Bull. 150. VIRGINIA AND WEST VIRGINIA. . Limestone, upper ledge, Moundsville Narrows, West Virginia. . Same as A, lower ledge. Analyses A and B by T. M. Chatard, record No. 127. . Trenton limestone, Lexington, Virginia. Analysis by R. B. Riggs, record No. . Limestone, Staunton, Virginia. Analysis by George Steiger, record No. 1630. . Part of D insoluble in one-tenth hydrochloric acid. . Soluble part of D. Analyses E and F, also by Steiger, same number. These three analyses are accompanied by analyses of the residual clay, formed by the weathering of the limestone. See section on clays. wo oS SmeoOV QW e H20 at 100°.... H20 above 100° NORTH CAROLINA AND SOUTH CAROLINA. A. Marble, from Marshall, Madison County, North Carolina. B. Marble, from Bakersville, North Carolina. Analyses A, B, by E. C. Sullivan, record No. 2157. C. Marble, from Fletcher, Buncombe County, North Carolina. Analysis (partial) by G. Steiger, No. 2209. CO, calculated to satisfy bases. D. Marble, from Caney Fork, Jackson County, North Carolina. Partial analysis by W. T. Schaller, No. 2259. CO, calculated. 192 ANALYSES OF ROCKS AND MINERALS, 1880-1908. E. Marl, Charleston, South Carolina. Analysis by W. F. Hillebrand, record No. 2187. 100.15 | 100.22 | 98.11 99. 91 @ Includes organic matter. GEORGIA. . Marble, Happy Valley. . “Creole’’ marble, Happy Valley. . Portion of B insoluble in dilute hydrochloric acid. . “Cherokee’’ marble, Happy Valley. . Portion of D insoluble in dilute hydrochloric acid. Analyses by L. G. Eakins, record Nos. 464, 485. Bote A. B. Cc. D. E. 100.28 | 99.69 | 98.84 | 100.04 98. 48 FLORIDA. 1, CORAL AND SHELL ROCKS, COLLECTED BY N. S. SHALER. Partial analyses only. Chlorides and sulphates present; alkalies and phosphates not looked for. A, B, C, D. Coquina gravel, Tortugas. E. The same, Key West. F. Near Fort Worth. G. East side of St. Johns River, near Seville. H. Corroded surface, Miami Reef. I. Near Oak Hill. J. Near Melborne. . CARBONATE ROCKS. 193 Analyses A to J by F. W. Clarke, record No. 885. | aA. B. Cc. Dz. E. F. G. H. I. J. a 22 32 21 -25 2.94 8.50 2.99 5. 87 17.83 -47 - 56 +76 - 56 23 .73 65 +95 1.18 61.24] 49.38 | 51.95} 51.52) 51.51 | 47.29] 51.22) 50.34 43. 85 2. 09 1.93 1.44 2.08 71 1.51 06 87 - 26 41.07 | 40.39 | 41.53} 41.58| 41.59 | 39.00] 41.22] 39.62 34.31 > 8.57 5.12 | - 3.07 3.19 2.64 3. 37 2. 23 3.21 2. 53 98.88 | 98.66 | 97.70 | 98.96 | 99.18 | 99.62 | 100.40 | 98.37 | 100.36 99. 96 K. Coarse shell mass, Senote. L. Coral rock, Salt Key Bank. M. Loggerhead Key. Analyses by L. G. Eakins, record No. 882. The following analyses, also by Eakins, No. 883, are included for comparison: ‘ N. Coralline bottom, Barbados. O. Recent coral (Siderostria), Bermuda. K | L | M | N | oO. (2)| ga} 20)|) mag | 298 — 18 04) 122 f. -31 fL trace. 54.87] 53.54] 53.54 46.45] 55.16 64) 71; 78] 5.15] 20 43.89 | 43.87 | 43.71 | 43.40 | 43.74 ALi ease), “8is] 7273 54 ; 99.91) 99.40, 99.26} 99.21) 99.87 2. MISCELLANEOUS ROCKS. A to M, inclusive. Thirteen borings from the artesian well at Key West. Partial analyses by Steiger, record No. 1553. The figures at tops of columns give depths in feet from which samples were taken. For a description of the limestones see E. O. Hovey, Bull. Mus. Comp. Zool., vol. 28, p. 63. A. B. c. D. E. | F 25 100 150 350 600 | 115 25 -12} 3.52] 5.10 18 al ZN os i 40 \ BB \ 14 54.01 54. 38 51.46 | 48.87 | 46.53 11 1.67 | 2.50 6.70 42.84 49,98 41.77 | 40.72 | 43.60 98.11 | 98.80 | 98.82 97.54 | 97.10 G H I J. K i M 1125 1325 1400 1475 1625 1850 2000 07 19 - 06 05 - 03 -07 - 11 -16 odd -17 17 -16 54.49 | 55.12 | 54.48 | 53.90 | 54.28 54. 02 62 30 73] ~ 1.14 1.12 1.06 43.29 | 43.28} 43.38 | 43.37 | 43.13 43. 20 97.83 | 98.58 | 99.05 | 98.79 | 98.63 | 98.73 98. 51 P20, is present. Is included with AlsOz and Fe202. 194 ANALYSES OF ROCKS AND MINERALS, 1880-1908. N. Supposed cement rock, River Junction. Received from D. T. Day. Analysis by George Steiger, record No. 1844. LOGS Bee hate oh Nae eens ae Nee SEE 12.:31,.| T2O!8t: 100? s00.occecnc secaganiiea sieeseenmnen 94 ATD OR: exccssasies Baaeanseeiaed Ae CRRANOIATEE EAS 12319) | TOK a DOVE LOO mrare v2 seca nasectner aetna 2.05 C5 OF coccensterceaia ars hemmed nine me Rees SE 266) | PaO gis xcs crcsutmcinds sa seniecurmecmin st a seacacicee 05 26228) | COs sev scisctiananines + peghineenineniss « andgeeaangs 38. 12 16.72 — none 99. 82 Seascooter eS . 50 KENTUCKY. A. Lithographic stone, 1 mile from Brandenburg, Meade County, on Ohio River. B. Typical lithographic stone from Solenhofen, Bavaria. Analyzed for comparison with A. Analyses by George Steiger, record No. 1894. H20 at 100°.... Ee above 100°. TENNESSEE, ALABAMA, LOUISIANA. a A. Limestone, Knoxville, Tennessee. Analysis by L. G. Eakins, record No. 1159. B. Knox dolomite, Morrisville, Alabama. Described by Russell in Bull. 52, to- gether with a residual clay derived from it. See section on clays. Analysis by W. F. Hillebrand, record No. 797. C. Limestone from Rayborn’s salt lick, Bienville Parish, Louisiana. Analysis by R. B. Riggs, record No. 323. D. White marble, streaked with black. From 5 miles west of Winnfield, Louisiana. Analysis by W. IF. Hillebrand, record No. 760. In addition to the constituents named in the table, this marble contains traces of barium, strontium, chlorine, and organic matter. 100. 05 | 99.90 | 100.53 | 100.19 CARBONATE ROCKS. 195 MISSISSIPPI. Limestones received from E. C. Eckel. Partial analyses by H. C. McNeil, record No. 2181. CO, calculated to satisfy bases. A. From Macon. B. From Scooba. C. From Border Creek. D. From Wahulak Creek. E. From Prairie Rock. F. Selma chalk, from north of Macon. G. From Lime Creek. A B Cc oe. E F G BIO a a cpaisstichs Sacaesiele eh remiatensing Memcacesiogere 9.09 | 16.48} 10.60} 20.00 1.13] 8.52 8. 06 AleO3+Fe203.. 6 7.47 | 6.97] 5.90] 8.92 - 68 6. 60 5.94 MEO. craic ects --| none -33| trace | trace} trace | none none a 45.38 | 41.64 | 46.21 | 38.61 | 54.55] 47.00 47. 41 TeO)e.cisiee ce sie te 1.08 . 67 - 82 1.03 - 40 1.00 1.32 COS ogaeg ee aiguennananpancieawcumaadeoememapeaye 35.61 | 33.04 | 36.26] 30.30] 42.81] 36.88| 37.20 98.63 | 99.13 | 99.79) 98.86 | 99.57 | 100.00 | 99.93 TYSON ius ccccncosaeeentcecaccsauewereuaaas 14.59 | 20.96 | 14.21] 25.79 1.36 | 10.00 10. 28 TEXAS. Supposed cement rock, Uvalde quadrangle. Collected by T. Wayland Vaughan. Analysis by W. F. Hillebrand, record No. 1759. A, the rock; B, the part insoluble in dilute nitric acid. A. B “19 20. 80 ; 3.44 40, 82 118 32, 41 1.14 25. 57 “19 100. 00 || pee a By difference. OHIO. A, B, C, D. Trenton limestone from New Vienna. E. Trenton limestone, Arcadia, Hancock County. F. Air-line Junction, Toledo. This sample contains a great deal of ferrous car- bonate. ’ G. Gas rock, St. Henry’s well, Mercer County. H. Oil rock, Lima. All Trenton. Partial analyses by F. W. Clarke and R. B. Riggs, record Nos. 729, 730, 732. Iron and alumina are present in soluble form. . A. B. Cc. D. E. ¥, G, i. 9.93 2.12 | 28. 43 8. 56 3. 52 2.27 1.64 49.04] 51.18 | 23.00] 47.17] 30.64) 50.34 32.24 - 58 . 37.64 | 42.04] 30.82 | 38.54] 42:82] 40.96 43. 92 97.19 | 98.42 | 95.15 | 96.86] 95.03 | 96.43 95. 16 196 =- ANALYSES OF ROCKS AND MINERALS, 1880-1908. The following partial analyses by F. W. Clarke, record No. 738, all relate to Trenton limestones: A. Well No. 3, Bryan. Gas rock. B. McElree well, Kenton. Depth, 1,315 feet. C. Huntsville. Depth, 1,405 feet. D. Prospect. Depth, 1,650 feet. E. Findlay street well, Dayton. Depth, 975 feet. F. Xenia. Depth, 1,075 feet. G. New Madison. Depth, 1,150 feet. A B Cc D. E F G Tngofb lees ston =i ppsua cantare redeeeemecaiteen’ 9.22) 5.26] 4.41] 26.12) 12.34) 9.23) Wit Fes), AO gee0-7 svg srareneds qicsia moeciemsecied 151] 110) 315] 257] .58| 18] 3.60 CAC O sackets (id meteaeereraeniemeemeacnse 49.00 | 84.32} 57.23] 66.02] 82.36] 86.54] 64.91 Ma00a. . v.05 .sceosocesee 24 seumaeeceeoees 38.59} 8.43 | 3316] 3.77] 1.67] 2.99] 17.98 98.32 | 99.11 | 98.95 | 98.58 | 96.95) 98.94] 97.60 In C and G there is ferrous carbonate. Partial analyses by Charles Catlett, record Nos. 754, 755, 756, 757; all of Trenton limestones from the natural-gas belt. A. . Air-line Junction, Toledo. Depth, 1,415 feet. . Celina. Depth, 1,112 feet. . City well No. 2, Upper Sandusky. . Sandusky. Depth, 2,260 feet. . Gas rock. Pauck well, St. Marys Township, Auglaize County. . Gas rock. Bennett well, St. Marys Township. Depth, 1,121 feet. . First city well, Carey. Depth, about 1,350 feet. OvosmsesrnArrAen tase London. Depth, 1,594 feet. Well No. 2, Fort Recovery. Depth, 1,065 feet. Waggoner well, 6 miles west of Fremont. Gas rock. . Loomis and Nyman well, Tiffin. Depth, 1,470 to 1,481 feet. Loomis and Nyman well, Tiffin. Depth, 1,488 to 1,494 feet. . Port Clinton. Depth, 1,660 to 1,700 feet. . Wauseon. Depth, 2,135 feet. . Napoleon. Depth, 1,830 feet. . Kossuth, Allen County. Oil rock. . Doenze’s well, Franklin Township, Mercer County. Depth, 1,107 feet. A B. | OC. D. E. F. G. H. I. . = 2,95 8.18 3. 65 3.18 | ° 1.66 5.72 54.68 | 68.41} 64.25 | 54.62] 52.18] 56.94] 80.11 35.73 | 24.18 | 15.93] 33.67] 38.42] 35.55] 8.09 8) »Ser S838 97.32 | 91.97 | 98.49 | 92.67 | 96.52] 96.90 | 96.63 | 97.00 98.77 J. K L M. N. oO P. Q Ansoluble a. scscicecatecic ns gate setateatong, 5. 22 5. 66 9. 88 7.46 | 18.24 2. 66 1.08 3. 68 AleOG, FeiOge.: cn cowcsvecscenoveneccs 6. 32 4. 86 1.46 4.16 7.28 2.14 - 66 8.38 CACO Se axis vancennrecedeuniagen SEMeees, 52.93 | 52.89] 79.39] 71.96} 42.82] 53.85 | 90.72 69. 53 Me COseses veescactesesbasecctexenaes! 32.75 | 33. 46 6.20 | 14.34] 28.11 | 37.33 6. 69 10.98 97.22 | 96.87 | 96.93) 97.92 | 96.45 | 95.98} 99.15 92. 27 CARBONATE ROCKS. 197 INDIANA. A. Buff limestone, Hoosier Stone Company, Bedford. B. Blue limestone, same locality. Analyses by F. W. Clarke, record Nos. 306, 307. The following Trenton limestones are all from the natural-gas belt: . Union City. Depth, 1,160 feet. . Bluffton. Depth, 1,062 to 1,067 feet. . Muncie. Depth, 920 feet. . Greensburg. Depth, 867 feet. . Vernon. Depth, 905 feet. . Wabash. Depth, about 900 feet. Analysis C by F. W. Clarke, record No. 738. The remainder by Charles Catlett, Nos. 753, 758. merevoa Cc D E F. G H. Insoluble... . 2.14 2.37 3.30 0. 87 8.00 3. 52 AleOa, Fe2Os. -| 1.23 4,48 3.72 +55 -60 7.58 CaCO3......- -| 83.21] 53.43 | 51.96 | 94.60] 85.56 53.18 MeCO3r: sxsmsesceicneewsenecase esiestace we seiadeeceaees 12.48 | 37.47 | 38.11 -36 | trace 30. 53 99.06 | 97.75 | 97.09 | 96.38 | 94.16 94.81 MISSOURI. Limestones and dolomites collected by W. P. Jenney. Analyses by L. G. Eakins, record Nos. 1184, 1207. CO, calculated. A, B. Cherokee limestone, quarry near Seneca, Newton County. C, D. The same, near Grand Falls, Newton County. = E, F. Dolomite, Oswego land, Joplin. 1,21 1.01 1.01 | 29.77 11. 66 13 08 +13 \ 1,32 1.08 - 07 -05 | trace trace 03)| ETRCS® |e cnistes efepersie cine 54.92 | 54.98 | 55.11] 21.46 28.72 a Ci +32 : 43.31 | 43.54) 43.65 | 33.13 41.55 100.03 | 99.84 | 100.00 | 100.22 | 100.47 | 100.22 KANSAS. A. Limestone, Silverdale. Analysis by Charles Catlett, record No. 967. B. Cherokee limestone, Short Creek, near Spring River, Cherokee County. Analy- sis by L. G. Eakins, record No. 1184. 15619—Bull. 419—10-——_14 198 ANALYSES OF ROCKS AND MINERALS, 1880-1908. C. Supposed marl, large surface deposit near Wakeeney, Trego County. Analysis by F. W. Clarke, record No. 212. , D. Limestone, SE. } sec. 13, T. 285, R.128.E. Analysis by G. Steiger, record No. 2295. Insoluble MICHIGAN, WISCONSIN, MINNESOTA, CANADA. Most of the rocks considered under this heading were described by Irving and Van Hise in Mon. XIX, pages 131 and 191. A few other analyses, also representing Van Hise’s collections, are taken from the laboratory records. The Canadian rocks are from near the boundary line, and relate directly to others gathered upon the Minne- sota side. A. Dolomite, near Sunday Lake, Gogebic district, Michigan. Analysis by W. F. Hillebrand, record No. 767. B. Dolomite, Penokee region, Wisconsin, NW. } sec. 22,T.44N.,R.5 W. Analysis by Hillebrand, record No: 768. C. Limestone, bed of Slate Creek, Huron Bay slate quarries, Michigan. Analysis by T. M. Chatard, record No. 894. From laboratory records; not in the monograph cited. D. Limestone, east end of Ogiskemannissi Lake; Minnesota. Analysis by Chatard, record No. 899. Not in monograph. > we ° o o eS 1.02 E. Iron carbonate, SE. } sec. 20, T. 47 N., R. 48 W., Michigan. F. Iron carbonate, south side of Sunday Lake, Michigan. G. Iron carbonate, Palms mine, Gogebic district, Michigan. Analyses E, F, and G by W. F. Hillebrand, record Nos. 769, 770, 771. H. Iron carbonate, Miner & Wells option, sec. 13, T. 47 N., R. 46 W., Michigan. Analysis by T. M. Chatard, record No. 893. CARBONATE BOCKS. 199 I. Iron carbonate, NW. } sec. 18, T. 47 N., R. 45 W., Michigan. Analysis by Chatard, No. 895. J. Iron carbonate, Penokee iron range, NE. } sec. 6, T. 45, R. 2 E., Wisconsin. P. R. C. 999. K, L. Black, slaty, carbonaceous iron carbonates, Animikie formation, Kakabikka Falls, Kaministiquia River, Canada. M. Iron carbonate, west end of Gunflint Lake, Minnesota. N. Iron carbonate, north side of Gunflint Lake, Minnesota. O. Iron carbonate, north side of Gunflint Lake, Canada. Analyses, J, K, and L by R. B. Riggs, record Nos. 376, 377, 378; M, N, and O by T. M. Chatard, record Nos. 897, 898, 900. Rocks M, N, and O are described by Clements in Mon. XLV, p. 380. P. Ferrodolomite, Marquette district, Michigan. Analysis by George Steiger, record No. 1473. P.R. C. 994. Q. Ferrodolomite, Marquette district, Michigan. R. Portion of Q insoluble in hydrochloric acid. 8. Soluble portion of Q. Analysis Q, R, and S by George Steiger, record No. 1442. These analysesare not in the monograph cited. 200 ANALYSES OF ROCKS AND MINERALS, 1880-1908. T. Ferruginous dolomite, Hamburg Hill, Menominee district, Michigan. De- scribed by Bayley in Mon. XLVI, p. 480. Analysis by George Steiger, record No. 2033. 27. 05 | 72.51 | 100.11 The three following analyses, by E. C. Sullivan, record No. 2160, are of material collected in Michigan by I. C. Russell. U. Marl, Ore Lake. V. Dolomite, Maybee, tenth layer from top. W. Like V, fifth layer from top. U Vv. WwW. BiQes cece seceniekdeateeeanacannets yisauyewesrede aut snntke asin reeredniemeains ae 0. 53 1.77 1.30 AleOs.- 14 -O1 16 Fe203¢ 96 41 MgO 1.10 | 20.84 19.79 CaO 51.87 | 29.65 31.14 Na2O Mt “AO lesemepedsemaieces Teg Ope ase Seo tite See Sah wee wiehioemeatnre ace AON, sen ees ecmse ses Fg Qv ait W085 ois cierse init: tees ress assays si ieeeee cine aes arcs 97 -12 «18 H20 above 105°. ........- ares Biss sigs apn raisons 1,22 - 48 .57 C Obie ssjeysisisie sia’ ciss s eperereretaete etait is gtsisseia cme raceestnsiisintsiisvterotaconaes ---| 42.30 | 46.40 45. 18 @ Total iron. SOUTH DAKOTA AND WYOMING. A. Purple limestone, east of Cascade, Black Hills, South Dakota. Collected by G. B. Richardson. Analysis by George Steiger, record No. 1854. B. Dolomite from the Tornado mine, Black Hills. Received from 8. F. Emmons. Analysis by W. F. Hillebrand, record No. 1866. CARBONATE ROCKS. 201 C. Limestone, Hunt Mountain, Bighorn district, Wyoming. Received from N. H. Darton. Partial analysis by Hillebrand, No. 2250. CO, calculated to satisfy bases. Insoluble. Ke HO at 105°... H20 above 105° co. @ Includes possible TiO2, P2Os, and Fe. YELLOWSTONE NATIONAL PARK. Travertines, tufas, and calcareous sinters. Analyses A to E reported by W. H. Weed in 9th Ann., p. 619. Travertines. A. Terrace below the hotel. B. Cupids Cave. C. Near Sulphur Spring No. 246, Mammoth Hot Springs. D. Extinct spring, main terrace, Mammoth Hot Springs. E. Ridge behind main terrace. Analysis C by F. A. Gooch, record No. 243; A, B, D, and E by J. E. Whitfield, record Nos, 240, 242, 244, 245. -49 05 14 th. 53.41 | 55.02 | 55.02 54. 06 ; 07 0 66 01 OS zretere seas | parasites 2103) || ssrcirereees |soraenes lnem seas 2. 44 1.61 1.06 1.19 13 12 -20 26 Cuaisdeaa| Seale cee OB renee 5. -49 -70 1.34 41.96 | 42.25 | 42.25 42.14 3 11 224 none 99.66 | 99.77 | 99.81} 100.02 Analyses F, I, J, by F. A. Gooch, record Nos. 93, 246, 257; G, H, K, by J. E. Whit- field, record Nos. 239, 241, 862. / F. Calcareous tufa, Mammoth Hot Springs. 202 ANALYSES OF ROCKS AND MINERALS, 1880-1908. G. Travertine, from cavity near Pulsating Geyser, Mammoth Hot Springs. H. Travertine, from bank of Hot River. I. Travertine, from edge of old cave, highest terrace, Mammoth Hot Springs. J. Travertine, capping Terrace Mountain, Mammoth Hot Springs. K. Caleareous sinter, Hot Lakes. Sp. gr., 2,857. C, organic. --- see ane Agu tp : : i AT |b Sees A, organics: -ccacwesuweacssecsactcasariaisess SeeeSetmes ODS a5. ae bia tho dren's | adamsane Senate atten @ Includes H of organic matter. MONTANA. Rocks A to H collected by A. C. Peale. Analyses by Charles Catlett, record Nos, 890, 905. A. North of East Gallatin River. B. West of North Boulder River. C, D. North of East Gallatin River. E. Base of Carboniferous, west side of Bridger Range. F. Middle Carboniferous, north of Gallatin River. G, H. Upper Carboniferous, north of Gallatin River. Analyses all partial. A, B, C, D, and H were published by Peale in Bull. 110, pp. 16, 28, and 40. ; A. B. Cc. D. E. F. G. H. 1.78 | 23.50 | 35.26 9.98 5.99 | 50.74 25,24 - 40 2. 50 1.92 38 - 58 30 5.30 54.54} 67.85 | 59.11 | 88.50] 91.96 | 32.28 40.21 42. 62 6.18 1.96 -95 1.35] 13.91 25. 25 99. 34 | 100.03 | 98.25 | 99.81 | 99.88] 97.23 96. 00 I. Marble, Elkhorn district. Collected by W. H. Weed. Analysis by E. C. Sulli- van, record No. 2195. A. Marble, Orofino. B. Limestone, Missouri Creek, Nez Perce County. Analyses A and B by W. F. Hillebrand, record No. 1905. @ Total iron. CARBONATE ROCKS. 203 C. Limestone, Snake River canyon. Analysis by George Steiger, record No. 1909. A B. Cc Insolubl@ es a--zi0 searsacecss ses 2 64 1.19 36 12 19 10 3.05 51 10 COLORADO. 1. DENVER BASIN. Rocks described by Emmons in Mon. XXVII. Analyses made by L. G. Eakins, in the Denver laboratory. A. Upper Wyoming limestone, Morrison. B. Niobrara dolomite. 2. LEADVILLE DISTRICT. Rocks described by Emmons in Mon. XII. Analyses A and E by W. F. Hille- brand; B, C, and D by A. Guyard; all made in the Denver laboratory. A. Upper blue limestone, Silver Wave mine. B. Upper blue limestone, Dugan quarry. C. Upper blue limestone, Glass-Pendery mine. D. Montgomery quarry, near base of blue limestone. E. White limestone, upper part, Carbonate Hill quarry. A. B. G D. E. 21 -70 27 7.76 11. 84 27 ALT -04 ll 1. 66 21 il 3322 10 1.51 24 38 -13 57 83 trace -05 +20 OG Pe iaesca rogers 30.79 | 30.43 | 29.97! 27.26 26. 60 21.14] 20.78) 21.52 | 20.05 17. 41 03 05 01 02 02 06 09 02 04 03 22 04 07 05 48 trace 12 +03 07 trace 46.84 | 46.93 | 47.39 | 43.79 40. 01 TAGE! | isieracsyevecollsicce.d ayes trace |........ 10 14 04 06 05 trace | trace |........ trace |........ 0 0. 02 OF | ses siciere 204 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 3. FAIRPLAY, PARK COUNTY. Analyses made by W. F. Hillebrand, in the Denver laboratory. A. Serpentinous limestone, Buckskin Gulch. B. Limestone, Fairplay. C. Limestone, Mount Silverheels. D. Dolomite-limestone, Mount Silverheels. Analyses B, ©, and D partial, with CO, calculated to satisfy bases. A. B. Cc. D. 4, PITKIN COUNTY. Limestones and dolomites collected under the direction of S. F. Emmons. Analyses by George Steiger, record No, 1559. CO, calculated to satisfy bases. Analyses par- tial only. A. B. Cc. D. E. F. G. -80 1.02 | 13.63 1.42; 31.12 7.78 1.63 2.10 1.88 3.34 36 - 88 23 - 06 64 42 -19 22 31.19 | 33.74 | 35.98} 31.61 | 37.28 38. 85 19.69 | 16.76 8.25 | 18.06 54 9.97 46.16 | 44.94 | 37.35] 44.70 | 29.88 41.47 99.70 | 98.62 | 97.73 | 99.55] 99.37 99. 17 The following samples from Aspen were analyzed by L. G. Eakins in the Denver laboratory. Partial analyses, (O, calculated as before. H. Blue limestone. I. Limestone. J. Dolomite. ase I. J WnSolwble ine 2a cens ve ca gessne eases nese aehenee aie Ys Ease ee Mins ee eae Sg ees ee ae -52 33 84 7 trace 1.31 55. 81 30. 46 .16 20. 90 44. 03 46. 92 100.39 | 100.33 | 100, 48 CARBONATE ROCKS. 5. GLENWOOD SPRINGS, GARFIELD COUNTY. Limestones and dolomites collected under the direction of 8. F. Emmons. partial only, by George Steiger, record No. 1559. 205 Analyses, CO, calculated to satisfy bases. A. B. Cc. Dz. E. F. G. MnSOD Os wccsrccisiscaciennumsay ncrmineccieeeaces 21.45 | 47.74 6. 47 3.71 9.44 | 17.82 1.96 Beg Osc anisnianinenisinws ceticeamin acannon ce maencawe -97 -18 42) none -26 74 03 BOO sd stsceause wer: cantare atemeteairehereern aaehlcned +23 salle 35 55 ~82 57 . 35 CAO cco seoceeeee eusce es eveseweneeeneeeceaees 40.64] 15.87 | 46.65 | 47.40] 39.56 | 26.50 32.14 MeO) sco secssissxcexeenseeeeiiecacenaceeekenn +73 | 10.60 2. 64 4.49 8.56] 14.86 18.72 CO geeees catmcntee ceccihtuen scare Beeeecmmeie 32.73 | 24.13 | 39.55 | 42.15 | 40.52} 37.18 45. 85 96.75 | 99.23 | 96.08 | 98.30] 98.66 | 97.67 99. 05 H. I J K. L. M. 2:27 -22 -23 - 06 : ae : ih none -10 . 14]} trace |} 09 | Rone} -20 Ae 53.79 | 55.17 | 55.49 | 55.81 | 55.45 55. 68 - 46 -21 -24 | trace 24 trace 42.76 | 43.58 | 43.87 | 438.85 | 43.84 43.75 99.42 | 99.18} 99.92 | 99.72 | 99.95 99. 64 6. TENMILE DISTRICT, SUMMIT COUNTY. Partial analyses, made in the Denver laboratory, by W. F. Hillebrand. CO, cal- culated to satisfy bases. Manganese and iron present as carbonates, but Fe,O, and Al,0; were not separated from them. A. A. V. Fletcher shaft, Copper Mountain. B. Pittston tunnel. C. Middle Carboniferous, Pearl Hill. D. Summit quarry. E. Dolomite, Sheep Mountain. F. Oolitic limestone, northwest corner of area. G. Pittston tunnel. ‘< A. B. C. D. E. F G. TNSONDIG = cic scse ceteceesnncncacuetaescnesen 2. 69 62 | 10.09} 1.75 78) 1.37) 7.91 21 125) 1.19 32] 1.50 20 132 54.23 | 55.24] 28.01) 53.60) 30.55 | 55.17} 50.83 221 24] 18.33} 1.23 | 20.15 .28 .70 42.97 | 43.81] 42.63 | 43.65] 47.04] 43.76] 40.90 100.31 | 100.16 | 100.25 100.55 | 100.02 | 100.78 | 100.66 H. Dolomite, Blackbird tunnel, Tucker Mountain. I. Summit King shaft, Summit City. J. Middle Carboniferous dolomite, Ptarmigan Hill. K. Hill north of Sugar Loaf. L. Quarry on southeast side of Searls Gulch. 206 ANALYSES OF ROCKS AND MINERALS, 1880-1908. M. Open cut below Sabbath Rest tunnel, Elk Mountain. N. Triassic, Jacque Mountain. H. IL Ts K. L. M. N. Insoluble... 2. 68 6. 75 . 65 4, 42 - 36 - 82 2. 04 FeO, MnO. 1.52} 3.08| 1.67 .10 «li? 07 15 CE O ioc mincieisexemrsmanwmnaatcececurtsarsen ior 31.60} 28.05] 30.90) 52.97] 55.58 | 55.47] 54.62 uy i padediansexsteys areicloos ..| 18.27] 18.15 | 19.75 40 .37 22) 25 CO gs vicnysenmseesconmecemeummaegyastcce eens 45.75 | 43.88 | 47.02] 42.12] 44.17] 43.86] 43.28 99.82 | 99.91 | 99.99 | 100.01 | 100.65 | 100.44 | 100.34 7, RICO DISTRICT. Limestone described by Ransome in 22d Ann., pt. 2. Analyses by W. F. Hille- brand, record No. 1914. A. From Forest-Payroll mine. B. Alteration product of A. C. From Nellie Bly mine. THO At 1058 cece owencemavayoeeversecenasns tenant aaa BL Hg O aD0VO 10S". iceman seisic anders sisarciscrsieisie sce : a By difference. UTAH. A. Marble from the Ontario mine, east end of the 1,000-foot level. Analysis made by L. G. Eakins in the Denver laboratory. B. Oolitic sand from shore of Great Salt Lake. Analysis by T. M. Chatard, record No. 156. Organic matte: 2 Calculated to satisfy bases. CARBONATE: ROCKS. 207 The following samples, C to J, represent altered limestones from the Bingham dis- trict. Received from 8. F. Emmons. Partial analyses by W. F. Hillebrand, record No. 1932. C. White altered limestone, Emma mine, west drift. D. Same locality as A, gray. E. White altered limestone, Highland Boy mine, No. 7 tunnel. F. Same locality as C, gray. WOO fase Aen 30 3. 66 1.31 99 48.34 | 45.52 53. 50 4.31 2 | ydeceetere 28. 06 8. 28 39. 32 00 |ecaniemen |aeitmiacares G, H, I. Altered limestones from different points on West Mountain. J. Altered limestone, Bingham Canyon. @ With a little TiO». The following rocks are from the Park City district. Collected by J. M. Boutwell. Partial analyses by G. Steiger, record No. 2207. K. Daly West mine. L. Scottish Chief mine. M, N. Silver King mine. K L M. N. 1.50 4.54 31 - 64 ll none -16 -30 20. 41 19.07 30. 54 29. 69 46.03 44, 27 none - 04 28 -25 99. 34 98. 80 a Includes possible P2Os. 208 ANALYSES OF ROCKS AND MINERALS, 1880-1908. ARIZONA. A. Fresh contact-metamorphosed limestone, Joy mine, Morenci district. B. Primary alteration of A, adjoining pyrite vein. Rocks A and B collected by W. Lindgren, and described in P. P. 43, p.172. Analy- ses by W. F. Hillebrand, record No. 1997. C. Representative ‘‘mineralized”’ limestone, Copper Queen mine, Bisbee. D. Dark limestone, Copper Queen mine. E. Alteration product of D. Partial analysis. Rocks C, D, E, collected by F. L. Ransome. Analyses by W. F. Hillebrand, record No. 2036. A B Cc. D E SiOz... 17.08 | 42.03 Al:03. 2.34 3.16 Fe203. 76 1.18 OO gs 8 ace sat ecg alae cme oe cian adn nd cae hea etwas || eae . 84 MO) sare cage saucers sce aehinsciers,2yslneacasiags, Bbidsaeeaiaaaetecn sista 2 12.38 | 20.25 MO asec cobs gas creoenedaos let thea d ara ecsuccagibe shal t\t dro Seateaye,coouena arevaall 32.48 | 10.41 INDIO cot cit ines eh AS be SG Sea MAS. eet yaO i Sra ayees Seal teaver 09 06 ee ty | a5) vor} 108 OPA EA ODP oa cixcecsierstas Sora A CReeraerses Bawa emesis Si ‘ ‘ < : HO above 105°... os sesso ee cece eee eee eeeeeee } stor} 4.25] 3.08 \ 57.00 i 64.36 LO gaze wiersisrinibecestismia estes senate Gemeiaine ms tisieawarsaeeentiad he = 62h we ws PLANO) 9 o/s Sects ie nin eimiciadsiicac (v2 seb soer eesti ets ints Bula seroma ee SS - 02 Oss way snl irmamaesn sxnbed Se nents ana eee enann es 26. 85 PSO sss te syarraieitaerante eter eweartande hasan Senet aman’ oie 16 SOb2ecemidemeere ar at nes so cee oeoemani we fe ye aeeleeeas tye 13 MN Olas ree cc cheese etc urs ha wih rain iets lola 26 SURO aie ois wpa tatn buss eleva Ge SeTedager eich SeTRSTIE A Sa sieaeahadsiadls,sig Ba baudiaga|iisleelen a FeSo.. 1.50 CuF eS. «18 LizO.. trace LO. sinc cearccscitluiad snemuadeSern eas heess paacateaes -99 99. 55 @ Includes possible TiOz and P20;. > By difference. ¢ Loss on ignition. NEVADA AND CALIFORNIA. A. Crystalline limestone, Eureka, Nevada. Analysis by E. A. Schneider, record No. 1279. B. From base of the Hamburg limestone, Eureka district, Nevada. C. From summit of Hamburg limestone, Eureka. D. Pogonip limestone (Silurian), Eureka district. Analyses B, C, and D made by W. F. Hillebrand in the Denver laboratory. Described by Hague in Mon. XX, pp. 40,49. In D the CO, was taken by difference. 99.95 | 99.87 | 99.92} 100.00 CARBONATE ROCKS. 209 E. Dolomite, 6.3 kilometers west of north from Red Mountain, Silver Peak district, Nevada. F. Dolomite, 16.3 kilometers northeast of Silver Peak village, Nevada. Analyses E and F by George Steiger, record No. 1859. G. White deposit, White Terrace, west shore of Pyramid Lake, Nevada. Analysis by T. M. Chatard, record No. 34. H. Cretaceous limestone from Mount Diablo, California. Analysis made by W. H. Melville in the San Francisco laboratory and published in Bull. Geol. Soc. America, vol. 2, p. 409. FeO and alkalies undetermined. H:0 at 100° H,0 above 100°. co a Calculated to satisfy bases. OREGON. Limestones collected in western Oregon by J. 8. Diller. Analyses by R. C. Wells, record No. 2381. . Ten and one-half miles southwest of Grants Pass. . Carter’s quarry, 54 miles southeast of Gold Hill. . Householder’s quarry, 5 miles southeast of Gold Hill. . Ridge southwest of Gold Hill. . Jones’s marble quarry, 3 miles southwest of Williams. . Applegate River, near mouth of Manzanita Creek. . Three miles southeast of Kerby. AQeteoaw> Oa ee hie cd dtc ie mene Mrcagnere dma edit es 23 37 +31} 23.86 -13 53 - 06 55.34 | 41.83 | 55.55] 55.05] 55.38 .03 | trace {| none | trace trace ei 46 : . 2 43.23 | 32.57 | 43.63 | 43.25 43. 51 99.91 | 99.04 | 99.95 | 99.85 99. 97 HAWAIIAN ISLANDS. Coral and shell rocks, analyzed for N. S. Shaler by L. G. Eakins, record Nos. 886, 887, 889. Analyses only partial. A. Laie. B, C. Kohuku Bluff. D. Kohuku coral flat. KE. Point near coral flat. F. “Modern chalk,’’ Oahu. 210 ANALYSES OF ROCKS AND MINERALS, 1880-1908. G. Diamond Head. < H. Under lava, Honululu. I. Old reef, Waialua. J. Campbell’s ranch, Waianea, Oahu. K. Wailuku Bay. L. Reef No. 3, Honolulu. M. Prison Knoll, Honolulu. D E. F G +25 26 a 2 2.97 19; 49 -21) 40. 71 2. 88 53. e 52.17 | 11.37 44. 82 43.89 | 43.95 | 11.09] 40.81 "93 | .70| 9.84] 1.86 98.29 | 99.38 | 99.42 | 99.57 | 98.80 | 98.85 98. 66 H 1 J K. L M 5.34 1.05 53 45] 3.53 81 B.1l 1.26 } 62 \ 1.82 |} 2.26 i 1.19 42.04] 51.07) 50.69/ 50.54| 46.52) 52.67 5.95 u 2. 98 1.83 | 2.45 ) 38.71; 42.68) 43.96| 42.80] 40.59] 42.81 1.61 1.33 46 1.93| 2.75) 1.24 98. 96 97.50 99. 24 99.37 | 98.10 99. 14 ANALYSES OF SLATES AND SHALES. VERMONT. Samples A to I, inclusive, are described by T. Nelson Dale in 19th Ann., pt. 3. Analyses by W. F. Hillebrand, record Nos. 1567, 1656. age. A. McCarty quarry, South Poultney. B. Unfading green, Eureka quarry, Poultney. C. Sea green, Griffith and Nathaniel quarry, South Poultney. D. Sea green, Rising and Nelson’s quarry, Pawlet. E. Sea green, Brownell quarry, Pawlet. F. Black, American Black Slate Company, Benson. Roofing slates of Cambrian A. B. Cc. D. E. F. SiO fis owesemwarexacumcncny erieoceeaaasednne eau vaieeeses 61.63 | 59.27} 62.37] 67.76 | 59.84] 59.70 Ml;Oges seswets seesutiee henson: yoaton sens nn ages 16.33 | 18.81] 15.43 | 1412] 15.02] 16.98 Ba Ogu axqicwian unweemoee woe neneoutiocas mamamecuacuaiusiers 4.10| 1.12] 1.34 -81| 1.23 62 BOO oc iniecciaisinisinls 25's boestielnais vsGdienaed 2 paaca oan NaaNG 2.71) 658) 534] 471] 4.73 4.88 MEO! sisc.cinaie cla Aaahue reach aesatedaias Uahacuunscemeeen 2.92: 2.21}; 3.14] 2.38] 3.41 3.23 COBO ncante tasalives Natecnadsmacecatmaa tn ee anenen iss eeeee -50 42 77 -63 | 2.20 1.27 NaaO 3 sis vecennienieae seaman ce veeacaseseeecearauums erent 1.26! 1.88) 1.14] 1.39] 1.12 1.35 Ta cys ne ctoisemmave yoeeraineint ame tinm reae nea rtentman spate 5.54| 3.75| 4.20/ 3.52| 4.48 3.77 GO, Ati TOO. aereisserrs.cisarcssioteatia asitneeanctster’ Dow Aemate a meats 231 -32 34 -23 41 -30 H20 above 100° 3. 24 3. 98 3.71 2.98 3. 44 3. 82 TiOe. - 68 +99 74 ee .74 -79 P205- .16 11 . 06 07 .09 16 MNO: ceceneatiwnndursusaceciinuiaancacs .09 18 22 .10 34 -16 BeO) siseiiatudanausoindatasaneaiolacecor 06 05 -07 -04 09 - 08 COB ciniae ten geeeeeeseoiecieounatededus AL 21 87 - 40 2.98 1.40 eGo e ccc ca sacs cacwseass cadens saeees -04 15 - 06 +22 0 1.18 ejb 5 eintn eave a etal eros er ssn ofS as isin NSS Bntcieielenstogs tae none | none| trace | none | trace? - 46 99.98 | 99.98 | 99.80 | 100.07 | 100.17 | 100.05 All six contain traces of lithia, of sulphates, and of nickel or cobalt. G. Unfading green, Valley Slate Company’s quarry, Poultney. H. Mottled, purple and green, Eureka quarry, Poultney. I. Purple, 1 mile south of Hydeville, in Castleton. Gs H. I. 60.24] 60.96 18.46 | 16.15 2. 56 5.16 5. 18 2.54 “2.33 3.06 . 33 71 1. 57 1.50 4.09 5. 01 -18 -17 3. 81 3.08 - 92 - 86 11 +23 -07 07 - 03 -04 - 08 - 68 -16 none undet. | undet. - 03 -O1 100.15 | 100.23 All three contain traces of lithia, nickel, and chlorine, and possibly of zirconia; in G and H traces of strontia, but none in I. 211 212 ANALYSES OF ROCKS AND MINERALS, 1880-1908. J. Slate from Guilford, collected for the educational series of rock specimens. Analysis by L. G. Eakins, record No. 1316. K. Slate from the Lakeshore quarry, Hydeville. Analysis by Eakins, record No, 1159. NEW YORK. Roofiing slates from Washington County, collected by T. Nelson Dale. Of Cambrian age. Described by Dale in 19th Ann., pt. 3. A. Red, three-fourths mile south of Hampton Village. B. Empire Red Slate Company, near Granville. C. National Red Slate Company, Granville. D. Green, three-fourths mile northwest of Janesville. Analyses by W. F. Hillebrand, record No. 1567. All contain traces of lithia, of sulphates, and of nickel or cobalt. No carbonaceous matter is present. SLATES AND SHALES. 213 E. Red slate from quarry 3 miles north of Raceville F. Green spot in E. G. Purple rim of green spot I’. Analyses by W. F. Hillebrand, record No. 1656. Contain trace of lithia and nickel. Fluorine not determined. PENNSYLVANIA. Slates from Lehigh and Berks counties, collected by T. Nelson Dale. Analyses by W. F. Hillebrand, record No. 2015. Rocks A, B, described in Bull. 275, p. 84. A. Black roofing slate, Washington vein, Hazel Dell quarry, north of Slatington. Sp. gr., 2.780, 21°. B. Black roofing slate, lower Franklin vein, old Franklin quarry, Slatington. Sp. gr., 2.783, 21°. C. Black roofing slate, partly weathered, 1} miles northwest of Waxatawny, Berks County. Dark variety. D. Like CG, light variety. ' E. Weathered slate or “shale clay,’’ one-half mile south of Fogelsville. F. Like E, one-fourth mile from Guth Station, South Whitehall. H20 at 105°... H20 above 105°. Carbonaceous matter 15619—Bull. 419—10—15 214 ANALYSES OF ROCKS AND MINERALS, 1880-1908. KENTUCKY, GEORGIA, ALABAMA. A. Indurated Carboniferous shale, in contact with the peridotite dike of Elliott County, Kentucky. Described by Diller in Bull 38. Analysis by T. M. Chatard, record No. 351. B. Fragment of shale included in the Elliott County dike. Analysis by Chatard, record No. 353. C. Bituminous shale, Dry Gap, Georgia. Analysis by L. G. Eakins, record No. 1316. P.R.C.22. Described by Diller in Bull. 150, p. 90. D. Middle Cambrian shale, Coosa Valley, near Blaine, Cherokee County, Alabama. Analysis by H. N. Stokes, record No. 1549. A B. Cc D Bi Oo-eveese S: tee, a elentednlnieeaag sa eeeeeea ede ta Saeeataas eee 41.32 | 35.53} 51.03 5, DVO ais ti i 5c dais aceaa casas S Bini dpSeealisl Dd anbeiepesshe aie Lo Ree, «SERGIO Dee DEBS 20.71 | 18.23 | 13.47 2. 5. 02 js 1. 02 Fe203 2.59 2. 46 8. 06 5.00 FeO. 5. 46 ABI |icinacisae 1.54 MgO 1.91 2.01 1.15 2.32 CaO. 9.91 | 21.17 78 1.60 Na,O 7.19 2.53 41 -81 TR Oa sana ss ciamsreysiscicimtern oiansiasniniahe sista wiamierendsnramstines Be calibrate a ERE ER -88 1.08 3.16 3.19 HO sat LOO 2 sesizccsaex, sasalaravaiasia tia pa ndiecatermaloule Mea 1a nomeisieaveleieisionie:: sited sete ees 1.40 \ 81 2. 44 HsOi above 110% sc. casein monases sheik areey 4 PS meee sanctity ----| 8.78 9.00 7 5.65 TiO:... ia - 48 295 -65 P2035. - 08 08 - 06 Mno. BaO. sro... N51 O rateesacucs-bsec e araislnien aide SOG sc.544 sa doondnned and Dndss stadeaetuies secanaats Cl castese Carbonaceous matt Fixed carbon....... Volatile hydrocarbons. . OHIO. Three samples of Utica shale from New Vienna. Collected by Edward Orton. Partial analyses by F. W. Clarke and R. B. Riggs, record No. 731. A. B. Cc. 29. 51 25. 80 33. 43 35. 27 2.16 1.32 27.16 | 27.40 93.77 | 92.26 | 89.79 hi and alumina are present in the soluble portions of these shales, the solvent being dilute hydrochloric acid. MICHIGAN. A. Clay slate, sec. 17, T. 43 N., R. 31 W., near Mansfield. Contains principally quartz, white mica, actinolite, rutile, hematite, and carbonaceous matter. De- scribed by J. M. Clements in Mon. XXXVI, pp. 59, 61, 210. Analysis by George Steiger, record No. 1709. SLATES AND SHALES. 215 B. Pink slate, from near base of Upper Huronian, Menominee district. Center of sec. 5, T. 39 N., R. 29 W., near Norway mine. Described by Bayley in Mon. XLVI, p. 298. C. “Briar slate,’ Vulcan iron formation, Menominee district. Also described by Bayley, op. cit., p. 330. Analyses B and C by E. T. Allen, record Nos. 1974, 1994. WISCONSIN. Slates of the Penokee-Gogebic series, collected by (. R. Van Hise. we a oS es 5 SSSBARsssan ay - POP, Porwhp trace F. Neocomian shale, altered, light brown, friable. From near Arroyo del Cerro. G. Calcareous shale, near Arroyo del Cerro. Hard, compact, dark colored. Very much altered. H. Red shale, metamorphic area at head of Bagley Creek. I. Silicified shale or phthanite, same locality as H. J. Clay slate, near the head of Yaqui Gulch, in Mariposa County. Described by Turner in Bull. 150, p. 342. Contains grains of quartz and feldspar, abundant car- bonaceous particles, a chloritic substance (?), and a fibrous alteration of sillimanite (?). Analysis by George Steiger, record No. 1643. SBaSERSf8E : “eo Ri ee) Ee ionstis ANALYSES OF CLAYS, SOILS, ETC. MAINE. Two clays from Thomaston, collected by George Otis Smith. Analyses by W. T. Schaller, record No. 2230. A. Thomaston brick yard. B. Hayden’s Point. 2 Uncertain, because of organic matter in the clays. The latter is included under ‘‘ignition.” COgabsent. P20; undetermined. MASSACHUSETTS. Two glacial clays collected by W. C. Alden. Analyses by G. Steiger, record No, 2308. A. Lancaster. B. Still River. P wo SR ee eres 8| RSSRSLSRLEK 100. 52 2 © The following clays and soils from Marthas Vineyard were collected by N. 8. Shaler. See 7th Ann., p. 303. Analyses by F. W. Clarke, record Nos. 439, 440, 441, 442, 443, 444, 445, 446, 454, and 455. Partial analyses only. A. Average sample of white clay, east end of Chilmark Cliffs. B. Average sample of clays, Weyquosque series, Chilmark Cliffe, 219 ‘ bo bo So ANALYSES OF ROCKS AND MINERALS, 1880-1908. Average sample of fine clay and soil, east end of Weyquosque Cliffs. . Sandy white clay, south end of Gay Head Cliffs. . Average sample of fine white clay, south end of Gay Head Cliffs. . Average sample of clay, north end of Gay Head Cliffs. . Average sample of southernmost red clays, Gay Head. . Brown clay, south of light-house, Gay Head Cliffs. . Average sample of red clay from the greensand, north end of Gay Head. . Pyritiferous clay, central part of Gay Head section. Hore yo oy CONNECTICUT. Five brick clays, received from H. E. Gregory. Analyses by W. T. Schaller, record No. 2138. A. East Windsor Hill Brick Company, South Windsor. B. Park Brick Company, West Hartford. C. Berlin Brick Company, Berlin. D. Tuttle Brick Company, Newfield. E. I. L. Stiles & Son, New Haven. 50.33 | 58.02 | 55.27 56. 75 27.06 | 17.93 | 20.52 17.54 2.29 4.89 5,34 4, 92 2. 62 1.24 1.55 93 1,22 3, 42 2.21 4.18 3,34 1,92 2. 80 2.34 1.78 3.33 2. 82 3. 40 4,40 3. 06 3, 43 3. 16 1, 42 +99 1.37 1,24 5.24 5. 36 5. 06 6, 28 99.70 | 100.16 | 100.37 | 100.74 TiO2, P2Os, ete., not looked for. NEW YORK, PENNSYLVANIA. A. Clay, near Richfield Springs, New York. Partial analysis by Charles Catlett, record No. 946. B, C. Clays, Northumberland County, Pennsylvania. Analyses by Charles Catlett, record No. 952. CLAYS, SOILS, ETC. 221 \ D. White clay, derived from sericite schist, South Mountain, Pennsylvania. Col- lected by G. W. Stose. Analysis by W. T. Schaller, record No. 2302. EtoH. Fire clays from Johnstown quadrangle, Pennsylvania. Collected by W.C. Phalen. Partial analyses by E. C. Sullivan, record No. 2281. E F G. H 66. 4 50.3 53.1 19.8 21.3 27.8 1.68 | 10.4 3. 08 -61 61 - 60 -10 39 22 -30 18 48 3.24 114 3. 58 1.0 79 1.2 6.4 12.0 10.2 2 Total iron. MARYLAND. Clays from the Matawan formation, received from W. B. Clark. Analyses by George Steiger, record No. 1684. A. Below Barnard’s wharf, near Betterton, Kent County. B. Severn River, below Round Bay, Anne Arundel County. C. Magothy River, near Wilson’s wharf, Anne Arundel County. D. Fort Washington Bluff. 27 52 90 10 -29 57 14 -16 59 90 1.16 1.92 32 - 69 1.09 1.90 2. 24 3.07 none 21 1.04 98.09 | 99.39 | 98.16 96. 98 a Titanic and phosphoric oxides not separated. No carbonates present. Sulphides undetermined. 222 ANALYSES OF ROCKS AND MINERALS, 1880-1908. VIRGINIA AND NORTH CAROLINA. A. Residual clay from decay of Trenton limestone, Lexington, Virginia. Described by Russell in Bull. 52. Analysis by R. B. Riggs, record No. 373. See also analysis of the limestone. B. Residual clay from limestone, Staunton, Virginia. C. Portion of B soluble in weak hydrochloric acid. D. Insoluble portion of B. Analyses B, C,and D by George Steiger, record No. 1630, See also analysis of limestone. E. Decomposed dolerite, near Wadesboro, North Carolina. Described by Russell in Bull. 52. Analysis by T. M. Chatard, record No. 327. F. Residual clay from decay of chloritic schist, Cary, 8 miles west of Raleigh, North Carolina. Analysis by R. B. Riggs, record No. 364. Described by Russell in Bull. 52. SOUTH CAROLINA AND GEORGIA. A. Clay from Charleston, South Carolina. Received from E. C. Eckel. Analysis by W. F. Hillebrand, record No. 2187. B, C, D. Clays from near Augusta, Georgia. Partial analyses by G. Steiger, record No. 1395. A. B. Cc. D. 60.24 | 61.36 60.70 \ 26.72 |\ 29.04 H 29.24 -88} | .76 - 68 present | present | present undet. | undet. | undet. undet. | undet. | undet. FLORIDA. A. Hammock clay, Melborne Creek. Collected by N.S.Shaler. Partial analy- sis by L. G. Eakins, record No. 881. B. Clay, Tampa. C. Clay, Lakeland. CLAYS, SOILS, ETC. 223 B and C collected by W. H. Dall. Analyses by L. G. Eakins, record No. 1255, partial. A B. Cc 70.78 | 80.39 11.33 | 15.03 318 | 193 14.55] 4.34 98.84 | 100.98 a Includes some COs. Clays collected by G. H. Eldridge. D, E. From the Sandlin place, 2 miles southeast of Marion, Hamilton County. F. From Richmond’s, 6 miles south of Leesburg, Lake County. G, H. From Bartow Junction. Analyses D, E, and F by H.N. Stokes, record No. 1493; Gand H by George Steiger, No. 1545. a Includes a little COs. I. “Filtering clay,’’ Ocala. Received from D.T. Day. Analysis by H. N. Stokes, record No. 1738. BIOS io xox akeanasts cnctasioaieis siehiwraates hateeamtersss 36.73. || TsO above 110°. 500. cnss2cecismneca seeessear 12.14 FASO 8 siaie /etetal ch ariccly grerswsuel ciety here ate aeeteeasleietsioes DEB TIO gcc xcsters wiasrae news sine ceo Se EKKO 1.27 G5 Og ey aoa at anne oS agape een ic et ete BoD Pog a xtcvda aietsstcterchactescg sheerla sioteraasielees s.shibenieensins 5. 54 MO Spee oicis iets eimicinsainienwiicmencdia neaeeeie Rete 864-1) (CO 8s scececneecieeeenemrauageg seams eteeteess none CAO e253. 5 citiccrctigauls wotinaeeloieals Siem aosneaersnie 281, | Ofganie Matter es ccc censezexscensese aeeencees 3.61 NBO eo srgoamadaaiesmabar dened Aiteecetemdan, none ane RG Oko ecanenineeecemereeened 2 acteeaeeete ~42 99088 GO: at E10 iy ic vere we ener hararcrds ceciacmeccaeen 7.38 ALABAMA AND MISSISSIPPI. A. Kaolin, Greenville, Alabama. Contains about 40 per cent of kaolin, with frag- ments of quartz, feldspar, and mica. Analysis by T. M. Chatard, record No. 1148. B. Residual clay, from decay of Knox dolomite, Morrisville, Alabama. Described by Russell in Bull. 52. Analysis by W. F. Hillebrand, record No. 797. See also analysis of the dolomite. C. Loess, from Vicksburg, Mississippi. Described by Chamberlin and Salisbury, 6th Ann., p. 282. Analysis by R. B. Riggs, record No. 294. 224 ANALYSES OF ROCKS AND MINERALS, 1880-1908. D. Stoneware clay, Holly Springs, Mississippi. Analysis by E. C. Sullivan, rec- ord No. 2105. Alkalies not separated, calculated as K,O. E. Clay, Scooba, Mississippi. Partial analysis by H. C. McNeil, record No. 2181. KENTUCKY AND TENNESSEE. A. Fire clay, Carter County, Kentucky. Analysis by F. W. Clarke, record No. 2073. B. Black clay, Mandle’s pit, Paris, Tennessee. C. Ball clay, same locality as B. Analyses B and C by E. C. Sullivan, record No. 2105. D. Clay, east of Parsons, Tennessee. E. Clay, Robins & Henderson pit, Pinson, Tennessee. Analyses D and E by W. T. Schaller, record No. 2107. All analyses partial only. A. B. Cc. D. E. SiOS: cemszens sseeeuasencmsamkee beeeemronseeen eben ereeeateaets 42.71 | 46.34] 52.31 | 70.76 70. 56 WTS Osawa: vec dmrdioicec eine eit Si xg utiiee sii baie Suede ack 38.88 | 30.30} 30.09) 19.29} 1818 Be2Qs. (total Pe) eve2ec ances cay oe cua acinwaiinsinie enlace denen 3. 36 1.19 1.29 1.09 1.30 PA AMEE Oars re a ct cepts cn 8 SE a gt aalgcet erage a5 (Siseib cia sterecepetade none 34 38 - 68 -55 CAO laws 2 Soa sin 52 diciuien eo Sqeeictsisinen Sto niGiesaiseseue tact cedseass -13 24 og 14 - 08 K20 (total alkali). .-.| undet. 78 1.72 | undet. | undet. Ignition. . -| 15.19} 19.68 | 12.44 6. 02 8.13 TiOg..... .--| undet. 1. 42 1.10 | undet. | undet. soetai sree reves rate trace | trace | trace trace 100.27 | 100.29 | 99.46 | 97.98 98. 80 ILLINOIS, IOWA, MINNESOTA. A, B. Clays from Henry County, Illinois. Analyses by T. M. Chatard, record No. 144. C. Loess, a stratum overlying residuary clay, 350 feet above the Mississippi River, near Galena, Illinois. Described by Chamberlin and Salisbury, 6th Ann., p. 282. Analysis by R. B. Riggs, record No. 293. Dried at 100°. D. Loess, 300 feet above the Mississippi, 34 miles northwest of Dubuque, Iowa. Described by Chamberlin and Salisbury (loc. cit.), and analyzed by Riggs, No. 292. Dried at 100°. CLAYS, SOILS, ETC. 225 E. Tallow clay, lead mine at Lansing, Iowa. Collected by W. P. Jenney. Analy- sis by H. N. Stokes, record No. 1337. Dried at 100° _ Partial analysis. F. Greenish-gray clay, New Ulm, Minnesota. Analysis by T. M. Chatard, record No. 825. 100.08 | 99.60 | 100.06 | 100.22 | 97.49} 100.32 WISCONSIN. Clays, etc., described by Chamberlin and Salisbury in 6th Ann., pp. 250 and 282. Analyses by R. B. Riggs, record Nos. 259, 260, 261, 262, 290, 295. Dried at 100°. . Residuary clay from Dodgeville, 44 feet below surface. . The same, 84 feet below surface. . Residuary clay from near Cobb, 44 feet below surface. . Same as C, 34 feet below surface. . Red, putty-like clay, containing pebbles, Milwaukee. . Red pebble clay, Milwaukee. devo S MISSOURI AND ARKANSAS. A. Typical loess, Kansas City, Missouri. Dried at 100°. Described by Chamberlin and Salisbury, 6th Ann., p. 282. Analysis by R. B. Riggs, record No. 291. 226 ANALYSES OF ROCKS AND MINERALS, 1880-1908. B, C, D, E. Tallow clays, Joplin, Missouri. Collected by W. P. Jenney. Analyses by T. M. Chatard, record No. 1210. F. Tallow clay, Aurora, Missouri. Collected by Jenney. Analysis by Chatard, No. 1210. In analyses B, C, D, E, and F the percentages of bases relate to the portion soluble in hydrochloric acid. Analyses only partial. 99.98 | 100.98 | 100.17 | 100. 46 The following partial analyses by H. N. Stokes, record No. 1260, all relate to tallow clays collected by W. P. Jenney. The same remarks apply as to B, C, D, E, and fF. G. Cave Springs mine, Jasper County, Missouri. H. Great Western mine, Granby, Missouri. I, J, K. Woodcock mine, Granby, Missouri. L. Coon Hollow, Boone County, Arkansas. Material dried at 103° G H T J kK L TMSOlMUID Eso 2icicis sisiccte nce wes hecho gacusasaaecencase 34.89 | 11.25 2.41) 16.17 3.85 18.18 MOIUDIE SIO ges isc cooTbessinmisiesciqcie sisiaicias 16.75 | 32.89 | 36.71] 28.62] 37.08 29.02 AGO 3s) creeemne ceca need seeee mnie steel amet 7.38 | 10.78 8.21 8.93 6. 46 6.34 FO2 OS oacanmaateabiesobudaue atbiosedakes 10.34 3. 89 2.75 5.98 3. 49 4. 40 MNO: seemed tigeetnecutecssesSeeee eee 14.35 | 29.54 | 38.59 | 26.23] 38.90 30. 50 (6:1 0 eee 1.55 2.65 2.77 2.01 2. 56 1.91 MEO ce cswisciscnceminceasmxlonarcsieeapieeniees = -35 - 90 +78 - 46 42 15 TQMIMOD sacsoccie:: visinsieonssieie ig teratassinssiaintavaicienayo(sig a pisiaeelsereys 10. 37 8.22 7.99 9.19 7.52 8. 36 95.98 | 100.12 | 100.21 | 97.59 | 100. 28 99. 46 The following clays, M to R, from the Hot Springs district, Arkansas, were received through E. C. Eckel. Analyses by G. Steiger, record No. 2221. M N oO. P Q R 74.55 | 73.96 | 70.31} 70.29 73.07 13.68 | 14.54] 17.27] 16.74 16. 40 1.27 2.17 1.85) 2.03 1.12 2.03 -49 91 1.50 - 64 -20 15 - 23 -10 +25 -10 - 80 - 26 -08 26 3. 84 2. 64 3. 51 2.76 2.75 ote 1.36 - 88 1.12 +36 3.63 3.76 4.36 5.00 4, 46 -73 34 1.00 - 64 1.09 100.65 | 100.80 | 100.21 | 100.58 | 100.26 | 100.40 CLAYS, SOILS, ETC. 227 SOUTH DAKOTA AND WYOMING. A. Red clay, east of Newcastle, South Dakota. B. Red clayey sandstone, east of Spearfish, South Dakota. Analyses A and B by George Steiger, record No. 1854. C, Loess, Cheyenne, Wyoming. Analysis by L. G. Eakins, record No. 1066. 99.69 | 100.28 COLORADO, A. Loess, Denver. B. Loess, Highland. CG. Concretion in loess, Wray. A, B, and C collected by 8. F. Emmons. Analyses by L. G. Eakins, record No. 1066. D. Clay, Davis ranch, Pueblo quadrangle. E. Clay, head of Rock Creek, Pueblo quadrangle. D and E collected by G. K. Gilbert. Analyses by George Steiger, record No. 1457. A B Cc. D E Bi Oe cedecserrn dhe icSiersisitiieatisl Dorms ne ad etaswae ee aapemmlinese ss 69.27 | 60.97 | 70.63 | 63.52 76. 56 SN SOS so ccdois corsets ceerden deolopecesi eC eesieiasiesle slits Nene 13. 51 15. 67 10. 43 24.72 8.30 Res OS 2c cctete cele meee cane ee ted chem wees scout on keke 3.74 5.22 2.58 -43 38 BOO) stavcie-srcusessave- ara sisraeiets ascta stats ai gin aaimramnsis Sp eREE oSialare ee ee 1.02 +35 ABS siecciescuseie|byersiisreese DBO Sc bee crest eeicismonemstane nna exrdcemeenienee tenn 1.09] 1.60} 1.13 13 24 CAO eat icterorecneritin Sod tierctaand ateinfeleie dtareatei atc aiaiaiemamersatieR 2.29 2.77 4.64 -30 12 Nee Q iowa sasauee ses needeassaneewstneastesceewewesics 1.70 97 1.29 | trace trace 4 rea tna Gane MeRECR eRe ESS 3.14 2, 28 2. 50 ‘eee tapes 20 at 100°... . d 26 H,0 above i00° } 419 } 9.83 i 3.77] gar) 4:40 AI OB seen ernsau cinerea lueihs isis bende ane uiacinegs ener aeee ae aR es ees - 68 60 228 ANALYSES OF ROCKS AND MINERALS, 1880-1908. F. From Red Creek canyon, southern part of Colorado Springs quadrangle. G. From 2 miles southeast of F. H. From near Canyon. I. Overlying H. Collected as probable fire clays by G. K. Gilbert. Analyses by George Steiger, rec- ord No. 1578. FeO, represents total iron. Al,0, includes TiO,. In I the ignition includes some CO,, which is absent from the others. 13 32 73 34 42 1,24 none - 03 08 25 - 56 48 3.78 | 11.80 10. 50 05 - 06 07 100. 21 | 100.38 | 100.36 | 100.43 J to R. Supposed fire clays collected in the area of the Apishapa sheet, by G. K. Gilbert. Analyses, partial, by H. N. Stokes, record No. 1503. Titanium present, alkalies undetermined. Analyses made on ignited material, reckoned as 100. The loss on ignition is separately stated below each analysis. J. K. L. M. N. 0. P: Q. R. 78.07 | 76.96 | 61.98 | 98.11 | 85.98 | 85.25 | 54.93 58. 56 20.22 | 20.77 | 37.51 5.56 | 13.67] 11.45 | 43.65 39.17 55 89 1.11 -45 1.15 4 2.24 -69 +26 32 -09 10, Paweinorne « 2k -05 45 ite sels 71 -19 32 21 - 26 64 1.08 99.44 | 99.87 | 100.22 | 100.24 | 100.27 | 99.41 | 99.96 99. 81 7.51 7.98 | 12.51 4.45 5.07 4.81 | 16.80 19. 58 S. Loesslike alluvium, Golden, Jefferson County. T. Fire clay, Golden, Jefferson County. Analyses S and T made by W. F. Hillebrand in the Denver laboratory. s T. SiO, 72.31 50. 35 AlLO3..- 12. 66 34. 44 Fe203. -. 4.67 75 MgoO.... 94 trace CaO 1,15 |psceesee NaO... 2.47 -10 K20 3.75 +48 H.O +organic matter 1.80 13. 88 BD be iasckaceteve rai aiaca:aiaheaveisnectanaiassasesniens Siaisioveeey eminem ietaieia es MRIS E MS aiwiiemd pias Hee cea semeresIeee Ho 2d: [seems ' 99.98 | 100.00 CLAYS, SOILS, ETC. 229 IDAHO AND UTAH. A. Adobe soil, Salt Lake City, Utah. Analysis by L. G. Eakins, record No. 996. B. Lava soil; near Shoshone Falls, Idaho. Described by Russell in Bull. 199. Analysis by W. F. Hillebrand, record No. 1950. Chews MnO. Organic matter. NEW MEXICO AND ARIZONA. A. Adobe soil, Santa Fe, New Mexico. B. Adobe soil, Fort Wingate, New Mexico. Analyses A and B by L. G. Eakins, record No. 981. C. Clay, Salt River Valley, Arizona. D. Clay, about 1 mile from C. Analyses C,D, by E. T. Allen, record Nos. 1945, 1959. a Loss on ignition. 15619—Bull. 419—10——_16 230 ANALYSES OF ROCKS AND MINERALS, 1880-1908. NEVADA. A. Grayish clay from upper Lahontan lake beds, Humboldt River bridge, Mill City. B. Grayish clay, lower Lahontan beds, same locality. Analyses by T. M. Chatard, record Nos. 32, 33. C. Adobe soil, Humboldt. Analysis by I.. G. Eakins, record No. 981. CALIFORNIA, WASHINGTON, HAWAIIAN ISLANDS. A. Sandy clay, Owens Lake, California. B. Blue clay, Owens Lake, California. Analyses by T. M. Chatard, record No. 551. C. Clay from foot of Rickey Hill, Kittle Falls, Stevens County, Washington. Analy- sis by W. F. Hillebrand, record No. 1428. D. Typical wheat soil, plateau south of Krupp, Washington. E. Residuary soil from basalt, Hausen Creek, Kittitas County, Washington. Analy- ses D and E by George Steiger, record No. 2028. F. Lava soil, Diamond Head, Hawaiian Islands. Analysis by L. G. Eakins, record No. 888. CLAYS, SOILS, ETC. 231 OCEANIC CLAYS. e Composite analyses of sediments collected by various exploring expeditions. Ma- terial contributed by Sir John Murray. The larger number of samples were collected by the Challenger expedition. A. The red clay. Composite of 51 samples, dredged from the sea bottom in all the great oceans. B. The portion of A soluble in water. Analyses by G. Steiger, record No. 2300. Additional determinations by Hillebrand revealed the presence in the clay of traces of molybdenum, and E. ©. Sullivan also found the following percentages of heavy metals: CuO, 0.02; PbO, 0.007; ZnO, 0.004; As,O;, 0.0007. C. Terrigenous clays, dredged at depths from 140 to 2,120 fathoms. Composite of 52 samples. D. The portion of C soluble in water. Analyses by Steiger, No. 2323. Analyses B, D, represent merely adherent sea salts. 100. 986 5.53 |100. 883 5.07 - 62 - 56 100. 366 |........ 100, 323 |........ ANALYSES OF METEORITES. STONY METEORITES. 1. ROCKWOOD, TENNESSEE. From the Crab Orchard Mountains, Cumberland County, about 83 miles west of Rockwood. Analyzed by J. E. Whitfield, record No. 735, and described by him in Bull. 60, p. 103. A. Analysis of the material as a whole. B. Nickel-iron separated. Forms not over 16 per cent of the mass. C. Nodule from meteorite. D. Portion of nodule, 94 per cent, insoluble in hydrochloric acid. May be enstatite. The stony part of the meteorite appears to be mainly pyroxene and anorthite. Fe,0, was not determined, and FeO represents the total iron oxide. 2. HAMBLEN COUNTY, TENNESSEE. Mass of nearly half and half stone and iron found about 6 miles WSW. of Morristown. Analyzed by L. G. Eakins, and described in Bull. 113, p. 61. A. The nickel-iron. B. The part of the stony portion soluble in hydrochloric acid; 37.63 per cent, recal- culated to 100, with sulphur deducted. C. Insoluble part of the stony portion; 62.10 per cent, recalculated to 100. A petrographic description of this meteorite is given by Merrill in Am. Jour. Sci., 4th ser., vol. 2, p. 149, together with an analysis of the feldspar. He finds it to contain in addition to the nickel-iron, enstatite, diallage, anorthite, olivine or monticellite, oldhamite or secondary gypsum derived from oldhamite, lawrenceite, troilite, and schreibersite. 232 STONY METEORITES. 233 99. 66 100.00 | 100.00 3. ALLEGAN, MICHIGAN. Fell July 10, 1899, on Thomas Hill, Allegan. Analyses by H. N. Stokes, record No. 1856. Described by Merrill and Stokes in Proc. Washington Acad. Sci., vol. 2, p. 41. Sp. gr., 3.905 at 27°, Merrill. A. Composition of the meteorite as a whole. B. The metallic portion, analyzed separately. C. Partial analysis of separated chromite. D. Composition of the stony portion. E. Stony material soluble in hydrochloric acid. F. Stony material insoluble in hydrochloric acid. The stony matter of the meteorite consisted mainly of olivine and enstatite, and amounted to 76.94 per cent. The metallic portion formed 23.06 per cent. Troilite was present and appears in the analysis of the stony portion. 4. WINNEBAGO COUNTY, IOWA. Fell May 2, 1890. Sp. gr., 3.804, 28°.5. Analyzed by L. G. Eakins, record No. 1190, and described in Bull. 78, p. 95. 234 ANALYSES OF ROCKS AND MINERALS, 1880-1908. Composition of the mass. INIGKGIPONsaccacdeseten oa nner seek S4oe oataame oe neeeelemes ee 19. 40 PROM tess acine ta ead os ac eee eee ta oe etal haem ae Se 6.19 Soluble silicates........-.----.-222----+----- Sone eee saeeees 36. 04 Insoluble silieatesin. sc -opsenecies sauet ys cers awiatddetiog casi: e's 38. 37 100. 00 Separate analyses: A. The nickel iron B. Silicate soluble in hydrochloric acid, calculated to 100 per cent. C. Insoluble silicate, recalculated to 100 per cent. The Cr,0; probably represents chromite. 92. 65 6.11 trace trace 99. 41 5. TANEY COUNTY, MISSOURI. Analysis by J. E. Whitfield, record No. 736. See Bull. 60, p. 106. Sp. gr., 4.484. A. The separated nickel-iron. B. The stony portion as a whole. C. Silicates soluble in hydrochloric acid, recalculated to 100 per cent. D. Insoluble silicates, recalculated to 100 per cent. A | B | D Peg ois oe eae esate ao. at | Nig esace ubcce nngeecgcnas 10. 41 OO soc -c Derere Hane vie SoRURCaeCaes -29 || F Be ocovecessteesc ra taaghoonncees ‘16 100.27 | 6. WASHINGTON COUNTY, KANSAS. Fell July 25, 1890. Analyzed by L. G. Eakins, record No. 1227, and described in Bull. 90, p. 45. Sp. gr., 3.49, 21.6° Composition of the mass. Nickel rote scsscacees eseaca Soe ies een ane eee aes 7.7 GS ROM EA GON Seas bY ctepest oe apse APSE MEg sac 27 chad anand a Mabel dpeeAadedel het sne Sersta eye 5.0 Solublewsilica tess. ocwecs Joss ey ves sox x Kone Seeder eee ees Gees 46.0 Insoluble silicatésvcccco.sahcexs 36 became eedeue see ses Peas eaee. 41.5 STONY METEORITES. 935 Separate analyses. A. The nickel-iron. B. Silicates soluble in hydrochloric acid, calculated to 100 per cent. C. Insoluble silicates, calculated to 100 per cent. A. B. c. 86. 76 12,18 99.77 7. KIOWA COUNTY, KANSAS. A pallasite found in Brenham Township. Analyzed by L. G. Eakins, record No. 1188, and described in Bull. 78, p. 94. A. The nickei-iron. Sp. gr., 7.93, 23.4° B. The pure olivine. Sp. gr., 3.376, 23.2° C. Dark outer zone of olivine, containing troilite. 99. 66 100. 36 2 8. TRAVIS COUNTY, TEXAS. Analyzed by L. G. Eakins, record No. 1097, and described in Bull. 78, p. 91. Sp. gr., 3.543, 20°. According to Cross, the stony portion contains olivine and enstatite, with a small amount of a colorless mineral, which is probably feldspar. Chromite is also present. Approximate composition of the mass. A. Total analysis. B. Nickel-iron. 236 ANALYSES OF ROCKS AND MINERALS, 1880-1908. C. Silicates soluble in hydrochloric acid, calculated to 100 per cent. D. Insoluble silicates, calculated to 100 per cent. 9. BLUFF, FAYETTE COUNTY, TEXAS. Analyzed by J. E. Whitfield, record No. 824, and described in Bull. 60,-p. 107. Sp. er., 3.510. Examined microscopically by G. P. Merrill, who reports, in addition to nickel-iron and pyrrhotite, olivine, enstatite, and what appears to be augite or an allied pyroxene. See Am. Jour. Sci., 3d ser., vol. 36, August, 1888. A. Total analysis. . B. Nickel-iron (5.67 per cent of total). C. Part soluble in hydrochloric acid, calculated to 100 per cent (60.62 per cent of total). D. Insoluble part, calculated to 100 per cent (33.3 per cent of total). This meteorite also contained a dark vein of specific gravity 3.585, which carried 2.30 per cent of metallic iron. Analyses, made on less than 0.4 gram of material, gave as follows, recalculated to 100 per cent: E. Soluble in hydrochloric acid, metal deducted. F. Insoluble. STONY METEORITES. 9387 E represents 51 per cent and F 44 per cent of the vein. 10. SAN BERNARDINO COUNTY, CALIFORNIA. Found in the San Emigdio Mountains. Analyzed by J. E. Whitfield, record Nos. 804 and 936, and described in Bull. 60, p. 114. In fragments, badly altered. Approximate composition of the mass. NickelrOnewewdacats sex ceapedvshsianie(ee vy oisn's ultieseieoeae ssxds 6. 21 Soluble:silicates, ete...c.csss. cose vss Seeaeecse teagkeeese sess 51. 26 Insolublesilicated..2 scice sects Payee cee acne tadaaeees cea ths 42. 23 99. 70 The soluble part was probably olivine and pyrrhotite, with secondary iron oxide. The insoluble part was enstatite, essentially. A. The nickel-iron. B. The enstatite. aA B Baten thie ct gl Celas acta a eae aoa WSIOrr spender ee en ea aaoded 54, 42 ashi = 14. 03 2. 46 29.11 100. 00 100. 02 11. BEAVER CREEK, BRITISH COLUMBIA. Fell May 26, 1893, near Beaver Creek, West Kootenai district. Described by Howell, Hillebrand, and Merrill in Am. Jour. Sci., 3d ser., vol. 47, p. 430. Composition of the mass. Nickel aroninoc sce dees: aos eseoteue yess Seaueeeddew ee ees oeewex 1713 Magnetite).cogcccandes ooaneewineewds Fe05 228 outickmeos se wee eeas . 16 THOUIE aes sis seaieic'slsosa Sameecem deeds MeeMees acces annie 5. 05 Soluble silicates and phosphate. ......-.-.-.------++++-++-+-+- 37. 23 Insoluble silicates and chromite. ......-..-.-.-+-++-++++--+--- 40. 43 238 ANALYSES OF ROCKS AND MINERALS, 1880-1908. According to Merrill, the silicates visible are olivine, enstatite, probably a little plagioclase, and some glassy base. Analyses by W. F. Hillebrand, record No. 1444. A. Nickel-iron. B. Nonmagnetic, stony portion. G. Portion of B soluble in hydrochloric acid, calculated to 100 per cent. D. Insoluble portion, calculated to 100 per cent. From C and D troilite and chromite are excluded. The chromite forms about 0.75 per cent of the stony matter. i | s | 100, 00 12. LLANO DEL INCA, CHILE. Analyzed by L. G. Eakins, record No. 1201, and described in Bull. 78, p. 97. Approximate composition of the mass. Nickel Aron: vesanenecodrneeievens ve eked pera eeneys sine eeeEWS 25.8 Trowvite)...sis2424 se cane eer eae sees eve eeweEeee eee ees dca pees 10. 6 HolubleisiiCateny, © sccm ates 2 2 Sages Bam AGatieen se nee Gaeta 30.9 Tmboltble silicates... os jcaina 2. Gan a habla te 4 cnn eee 32.6 99.9 Separate analyses. A. The nickel-iron. B. Silicates soluble in hydrochloric acid, calculated to 100 per cent. C. Insoluble silicates, calculated to 100 per cent. Is the P.O, in B derived from schreibersite? he | B. Cc WO sje wcnieets i4 chem 2 Sate tited oe ee 89.77 99. 55 METEORITES. 239 METEORIC IRON. A. The Mount Joy meteorite, found near Two Taverns post-office, near Gettysburg, Pennsylvania. Analysis by L. G. Eakins, record No. 1318. B. From Pulaski County, Virginia. Sp. gr., 7.95, 23°. Analysis by Eakins, No. 1228. Described by Eakins in Bull. 90, p. 45. C. From Ellenboro, Rutherford County, North Carolina. Described and analyzed by Eakins, Bull. 78, p. 93. Record No. 1160. D. From Linnville Mountain, North Carolina. Analyzed by J. E. Whitfield, record No. 822, and described in Bull. 60, p. 107. Sp. gr., 7.778. E. From Cherokee County, Georgia. Analysis by H. N. Stokes, record No. 1527, F. From near Holland’s store, Chattooga County, Georgia. Analysis by J. E. Whitfield, record No. 765. See Bull. 60, p. 106. Sp. gr., 7.801. G. From Hamilton County, Texas. Sp. gr., 7.95, 27° Analysis by L. G. Eakins, record No. 1189. See Bull. 78, p. 95. H. From Mart, McLennan County, Texas. Analysis by H. N. Stokes, record No. 1857. Described by Merrill and Stokes in Proc. Washington Acad., vol. 2, p. 51. I. From near Scottsville, Allen County, Kentucky. Analysis by Whitfield, record No. 509. See Bull. 55, p. 64. J. Fell 6 miles east of Cabin Creek, Johnson County, Arkansas, March 27, 1886. Analysis by Whitfield, record No. 505. See Bull. 55, p. 63. K. From near Grand Rapids, Michigan. Sp. gr., 7.87. Analysis by R. B. Riggs, record No, 296. See Bull. 42, p. 94. 99.99 | 100.26 | 99.422 | 99.95 | 99. 42 L. The El Capitan iron, from near Bonito, New Mexico. Analysis by H. N. Stokes, record No. 1527. M. From La Bella Roca, Sierra de San Francisco, Mexico, State of Durango. Anal- ysis by J. E. Whitfield, record No. 1037. Bull. 64, p. 28. N. Troilite nodule from L, outer part, somewhat altered. 240 ANALYSES OF ROCKS AND MINERALS, 1880-1908. O. Troilite nodule N, inner part. Analyses N and O also by Whitfield, record No. 1037. P. From Puquios, Chile. Sp. gr., 7.93, 25.2°. Analysis by L. G. Eakins, record No. 1181. See Bull. 78, p. 95. Q. The Abert iron, of unknown origin. Analysis by R. B. Riggs, record No. 356. Sp. gr., 7.89. See Bull. 42, p. 94. 99.80 | 100.10 | 97.23 | 96.77 | 99.55 99. 88 The two following meteoric irons were analyzed by L. G. Eakins in the Denver laboratory. A. Found near Albuquerque, New Mexico. Described by Eakins in Proc. Colo- rado Sci. Soc., vol. 2, p. 14. B. From Wyoming. Partial analysis. ANALYSES OF MINERALS. In the following pages the analyses of over 180 mineral species are given; a con- siderable number of the species having been originally described as new by chemists connected with the Survey. These species are josephinite, cuprobismutite, warrenite, guitermanite, elpasolite, zunyite, ptilolite, hydronephelite, lucasite, antlerite, knox villite, redingtonite, plumbojarosite, emmonsite, powellite, morencite, coronadite, purpurite, goldfieldite, and arizonite. In other cases minerals which were im- perfectly described have been more sharply characterized and their true composition made known. Natrojarosite, for example, is here definitely recognized as a species. In general the order of Dana’s classification has been followed, but with some ‘ small variations. Thus the tellurides are put in a group by themselves, the borosili- cates are brought together, while the phosphates, vanadates, and arsenates are given as three separate classes. On purely chemical grounds these changes are warranted; on morphological grounds the usual mineralogical classification may be better. I. NATIVE ELEMENTS. GOLD. From Persia; exact locality unknown. Analyzed by Charles Catlett. JOSEPHINITE. A nickel-iron alloy found in placer gravels in Jackson and Josephine counties, Ore- gon. Described as a new species by W. H. Melville, Am. Jour. Sci., 3d ser., vol. 43, 1892, p. 509. Waterworn pebbles. Sp. er., 6.204. CO ssscste ciotsecseen 7 Silicates (anhydrous)..........-.......22.-. 12. 26 SIG paso 35S pephasage eee e Nene gad oat eco ed Z H20 below 100° Pyrrhotite H20 above 100°.... Chromite Volatile matter... . AB eheg MOB SIN Lacisnieisennin-n ice nein aincinmasen : 100. 55 The silicate admixture, including the water, amounts to 13.38 per cent, of which 12.88. per cent, soluble in hydrochloric acid, is serpentine. The ‘insoluble portion may be bronzite. Analyses of the silicates are as follows: Insolu- Soluble Total. | ble por- portion, 33 -03 30 2.08 04 2.04 32 | trace 82 1.62 06 1.56 2.69 14 2.55 08 |ecereens 08 ITZ lececgiess 1,12 13. 38 50 12. 88 242 ANALYSES OF ROCKS AND MINERALS, 1880-1908. For analyses of nickel-iron of meteoric origin, see the preceding section of this bulletin. II. SULPHIDES AND ARSENIDES. BISMUTHINITE. From the Rosario mining district, Sinaloa, Mexico. Analysis by W. H. Melville. Described by him in Bull. 90. Bliscciun teat Habitad acoaanstne Seredeseemsade Saat Atenihs biieelnsatdind acemncHe gicdsaewie: ene 72.90 Dib caress sidise 222 Seed aeelere eta ayia aah aera aibadord sa ecadannt Danercadira sweet hea 6.03 OU nai sicnie setnerieniee s San eewnemuns FeeceeE SER Ge eui dedeemaes eee edeGede mee swemel 1.67 ROS eiginciistre cuss nedietnsiercisine § name siento neiswineniemart seca acts Seem RE mar 35 Sa ecceeusednatears seine gees ris eecsbtake ceemactnng Hey acmiecieitls s.clanciaromine elagee bios Sewhisomaan 18.11 QUaFt a 2s seers oxseeeeeeaceeks Hesemeonaes vetoes soe eau ere teortob esate aceemacy -63 99.69 METACINNABARITE. Crystallized material from New Almaden, California. Analysis by W. H. Melville. Not free from admixtures. LBs p2caseciaks oe eveke meee ete eee eke ckec as: M8: 01 | C@COsexenscisace areowassiargeeedueomaiescen 7 Skisscceeceee oe sles pace Un ieee A3568: | Quartee. 22 coet eet vee iad a eee dein 4.57 Gio Sos cegee pales ros Bias Rese IP es ER e6l. | Organic matters o:5 ccc nes ee eseicasecees 63 GOn codhsdeiod slew ueegaaeeedeiaG ies eae trace — DU ecmrade isha ot saanmsdecosene teh iewes -90 99. 26 Mi esc eircarmemmuaiweaiia: aanteecceti See eee 15 Another specimen of metacinnabarite from Knoxville, California, gave Melville the following figures: eager ae Ta TST At ld eT i cect carte ea cae 98. 48 Fhe hc he Sateen ib eaten aa petals ane at ed wate nts cheers ene eh Rerea eons 69 SIO ascot Saneeaiatecly Sateen utancromsions ian epamnleeames anette eed pera ered ay Set 71 99. 88 The latter mineral was described by Melville and Lindgren in Bull. 61. COVELLITE. From the East Greyrock mine, Butte, Montana. Collected by G. W. Tower. Analysis by W. F. Hillebrand. Color, indigo blue. Massive. Sp. gr., 4.76 at 26°. CU ccreisidlged Beek s Ae AEG tehinsephnied oushnauene aaled Gian oe ambattetwamer eed eaueemear 66. 06 IS jaichecaiaseee robe Deed ep seeretcien yn SIS aetna acta vert rere aera a mnties Se SRNR eratera ies ayaaclecersei tne see 33. 87 TRO) ess cijera Hie amin eihard eyed nae eee eerie aes Hina ieeliemmraraiestens mieraienlots aroiey sieiatad Saisie uraSio -14 Tnsolible isisccsseoiscccn memes cman cieceeeniaie beeen deinici snc ce aeacluidcins anna coat amoesie meg 100. 18 POLYDYMITE. A massive ore from the mine of the Canadian Copper Company, Sudbury, district of Algoma, Ontario. Specific gravity, 4.541. Analysisby Charles Catlett. Described by Clarke and Catlett in Am. Jour. Sci., 3d ser., vol. 37, 1889, p. 372. Composition nearly Ni,FeS,. A. Actual analysis. B. Analysis corrected by deduction of quartz and chalcopyrite. MINERALS. 243 Another nickel-iron sulphide, from the Worthington mine, Sault branch of the Canadian Pacific Railway, 25 miles west of Sudbury, has been analyzed by W. F. Hillebrand. Grayish, with a cast of yellow. Not pyrrhotite. Possibly a mixture of polydymite and pyrite. Still another nickel-iron sulphide is described by Hillebrand in Jour. Am. Chem. Soc., vol. 29, p. 1027. It is found in association with the patronite of Minasragra, Peru, and appears to be a new species with the formula (NiFe)8,. For this the provisional name bravoite is suggested. Analysis by Hillebrand. The deficiency is possibly due to the partial oxidation of the vanadium present. The latter represents unsepa- ‘rated patronite. STROMEYERITE. From the Silver King mine, Calico, San Bernandino County, California. Sp. gr., SULPHIDE OF SILVER, COPPER, AND ZINC. Massive, resembling bornite. Apparently homogeneous, but may be a mixture. Sp. gr., 5.407 at 20°. Analyzed by W. F. Hillebrand and described in Bull. 55. From the Gagnon mine, Butte, Montana. aCalculated to saturate CaO. b Partly from H of carbonaceous matter. cIncludes a little P203. 244 ANALYSES OF ROCKS AND MINERALS, 1880-1908. LOLLINGITE. From Teocalli Mountain, Brush Creek, Gunnison County, Colorado. Sp. gr., 7.400 at 14.5°, corrected for impurity. Analyzed by W. F. Hillebrand and described in Bull. 20. ING cea cices dereetratecraccion =e Se eeed Saaieebacl cd Sed baed tee eee Haste ea oe SACRE 71.18 eB sda vesain daa oigihnenheianimeass ae sete eee Ss ween Gee dee Se sauieleieitiee ea ctcewiions ew neces De -56 Bilvaetess ded omrerangeielssisin unions to seen eGee Ede neeee Dolomite senor ssotes acuisaece: - 08 Ctlscic ceexesneemeg sean istecucens cc cmemmating s See hisem ease deeseneenises Eeheremasaeeae ses 39 RG pocce ce cae Gh es eireee ee Nee tess ecltceemescin ss Renibieuns Eaeteeiees aesee eee tees 22.96 CO zac tase esaeueees Mesdees See cereds ceaeteresin: ne tiniebisics peseeel ce ened 4. 37 IND ad ciee tino id cei oiind heer cae Mae Bt eee eae ered aed sede semis weenie 21 99.75 A doubtful arsenide of nickel and cobalt has also been examined by Hillebrand and described in Proc. Colorado Sci. Soc., vol. 3, pt. 1, p. 46. From the Rose mine, Grant County, New Mexico. Sp. gr., 6.644 at 20° Probably a mixture. Ni: Co=3:1, approximately. Ia eae ya se RT MENS eras iafe PAS eect ope Ae Tai04: | INI; COw 2 crear seenewns luck veadteeeeeate. dea, DONS2 a egy lal og SEE See EC sto a LE EIA VS | ACR O ie cael cal BUR a teigseen omit aie Sats de 09 Ste apn en yt Saag ee fig De ieint certs a Sie Steae BAS! || MEO cicisicpetesieg ce eiciesitiecasictelsteawaseeieceate 18 05 elites se Dehins 04 ee ares: 03 99. 12 shacvthe:: ianieelcis cm iiascisiveiaiaaeencnte 2a MER 44 ARSENOPYRITE. From Franklin Furnace, New Jersey. Approximate analysis, on only 0.25 gram of material, by E. C, Sullivan. Notable as containing cobalt. The arsenic is probably a trifle too high. POs saz sitacaieaks Stet ddeosn te aetontass Wa aen Ad neste tetas Ratan maiaeambewinemnse 32, 48 COeccusmmamaamannr sees seeeelanabsis motion Gulem naan gatas beraeld § See cleaciesGlere Rae Abeieisls 1.16 BS cats tamemeumaniis va PRe Randa cindia es Fé Nalecin da deme alemadaeinsne palleenp KE ae 48. 72 Bide s eicie Gasiemeacisinnssigisishe seerendin aisieansrmenectiadcinn enbbu@adtnda okerdedete eeoeneMmeis ak $y 18. 80 101.16 GLAUCODOT. From the Standard Consolidated gold mine, Sumpter, Oregon. Analyzed by W. T. Schaller, and described in Bull. 262, p. 132. A. Analysis as made. B. Analysis recalculated to 100 per cent, after deducting gangue. MINERALS. 245 PATRONITE. The vanadium sulphide from Minasragra, Peru. Analyzed by W. F. Hillebrand, and described in Jour. Am. Chem. Soc., vol. 29, p. 1019. Of the sulphur, 4.5 per cent is free, the remainder is combined. The oxidized constituents represent impurities and gangue. a ENARGITE. From the Rarus mine, Butte, Montana. Collected by G. W. Tower. Analysis by W. F. Hillebrand. CUPROBISMUTITE. New species, discovered by W. F. Hillebrand and described by him in Bull. 20. Named by Dana. Sp. gr., 6.680 at 15°, corrected for impurities. From the Missouri mine, Halls Valley, Park County, Colorado. Analyses, by Hillebrand, of three different samples. a Calculated. ZINKENITE. From the Brobdignag mine, Red Mountain, San Juan County, Colorado. Sp. gr., 5.21 at 18°. Analyzed by W. F. Hillebrand and described by him in Bull. 20. 15619—Bull. 419—10——_17 246 ANALYSES OF ROCKS AND MINERALS, 1880-1908. WARRENITE.¢ New species, described by L. G. Eakins in Am. Jour. Sci., 3d ser., vol. 36, 1888, p. 450. From the Domingo mine, Gunnison County, Colorado. Occurs in matted, fibrous masses, known locally as ‘‘mineral wool.’’ Analysis by Eakins. COSALITE. From the Comstock mine, near Parrott City, La Plata County, Colorado. Described by W. F. Hillebrand in Bull. 20. Ee yes paar inert aera eee ees SES 42.93 8. 43 -- 7.50 aaigre aoe aes stad dyleee -- 22.49 jad SiS els searches gets steaats sdteytoners wise Saat) pepesa Gh iagh eleeoepeloiaia sae eteisiaee Zui ie -70 wid seuircweneisermedesdeelaesivideweeGedteieaeais Cecedesseiee eee -- trace acisiaiainieteis me atnis wince eneasemmmbiaiee reams Seeee eile cle ee s eaeia cece ca eameseecceene 17.11 99. 16 FREIESLEBENITE. ‘ From Augusta Mountain, Gunnison County, Colorado. Known locally as ‘‘min- eral wool.’’ Remarkable for its freedom from silver. Analyzed by L. G. Eakins and described by him in Am. Jour. Sci., 3d ser., vol. 36, 1888, p. 452. BOURNONITE, From Boggs mine, Yavapai County, Arizona. Analysis by W. T. Schaller. 1.67 20. 04 2. 81 18.99 TETRAHEDRITE. From Anchor mine, Park City district, Utah. Analysis by G. Steiger. @ According to L, J, Spencer, warrenite is identical with jamesonite, In that case it can not be regarded as new, L MINERALS. 247 GUITERMANITE. New species, discovered by W. F. Hillebrand and described by him in Bulletin 20. From the Zuiii mine, Anvil Mountain, near Silverton, San Juan County, Colorado. Forms the matrix of zunyite. Corrected specific gravity, 5.94 at 17.5°. Analyses by Hillebrand. ‘Adiixed gunyltetAuiEOe cudue mica Mable aes somone 1.77 Repth ee ocd eed Ge Oeics paps Rien asd Pee eaters 13.40 III. TELLURIDES. HESSITE. From San Sebastian, Jalisco, Mexico. Sp. gr., 8.24 at 26°. Analysis by W. F. Hillebrand. UA Ne aS oer peepee ee enmesemegmna dvds Sele tases aa Lae JAS IAd SSG. 61.16 VG 2. 5:32 Sk esemrayeeisie ce Sec wniee Sse cee SSRI SER ae eemhem eater eetee eee tees 36.11 BD: sscsex cds gabe coedidees Lec ncumentcingiaa sees aediculemenesensereee aes Seema R eRe ss 1.90 Gy WG) Zblscccceresniccsearenientaearseaeteannccs Sete ccaicietecislantde ee eicewldeeneearegees undet. PETZITE. From the Norwegian mine, Calaveras County, California. Collected by F. L. Ransome. Sp. er., 8.925 at 23°. Analysis by W. F. Hillebrand. Formula, Au,Te.3Ag,Te. A Gietdccicssisiale epe-sendinrewirereissisld darcemieli imams epicicr ieee eee reeeesm eee eGane OseeOsedese se 41. 87 WU iene sep ewe eee de epeeedinwicanaen sytieeew snc doe Sexe eres TeRe meses Hee CERES EHR EE 25.16 Nes oecoa aden seeituan setae ees erndcee ede cians Sen tise ere neti See rss a 33. 21 BOs oe ceteig Sante wins sh oa eee ee Ueaes Sey eee ne ome eet eee seme ieeen cide meienicte trace Muse bec ccphden She taiomne aiaik austesats oyeisiniene sae teat Serena ees ereem eens 08 SYLVANITE. From the Elkton mine, Cripple Creek, Colorado. Analysis by W. F. Hillebrand. Approximate only. Alpe cease bac dnrmeeoeeiee acing bs Ge Scdais Be RARE Redaereis exedecearceeeasiete asia 11.0 YRAD i chcseehet cia ce esa ice Sacre RH Cia Reot Reoutaes oc sl H ODO NOS Eee ae ee eh peters 26.7 ED 6 open era an gale ses fei ante dc esarn o ee Sea RAINE eA SE oe ences Sata iguagduanes 62.3 100.0 CALAVERITE. From Cripple Creek, Colorado. Collected by R. A. F. Penrose, jr. Analyzed by W. F. Hillebrand and described by him in Bull. 167. ; A. From the Prince Albert mine. Corrected sp. gr., 9.6 at 24°, B. Raven mine. : C. C. 0. D. mine. 248 ANALYSES OF ROCKS AND MINERALS, 1880-1908. Mg.. O, F, and soluble SiOz by difference 99.88 | 100.47 | 100.00 a Calculated from Fe to make FeS.. ’ As MnO2? MELONITE. From the Melones mine, Carson Hill, Calaveras County, California. Collected by F.L. Ransome. Analyzed by W. F. Hillebrand and described by him in Bull. 167. Three samples. Sp. gr. of B, 7.72 at 22.5°, which is probably too high for the pure NiTe,. Sample C is the purest. 1 A. B. Cc. --| 75.29 | 77.72 80.75 a i 15.71 | 17.16 Hi 18.31 8.44] 5.09 86 99.44] 100.07 | 99.92 TETRADYMITE. From near Whitehorn, Fremont County, Colorado. Sp. gr., 7.816 at 20°. Analysis by W. F. Hillebrand. GOLDFIELDITE. A new mineral, collected by F. L. Ransome, at Goldfield, Nevada, and analyzed by Chase Palmer, has been named goldfieldite. The analysis is only preliminary, for the material was too scanty to admit of the most thorough work. Described by Ran- some in P. P. 66, p. 116. 33. 49 21.54 17.00 19. 26 MINERALS. . 249 IV. CHLORIDES AND FLUORIDES, HALITE. Rock salt from Salton, California. Analysis by E. T. Allen. EMBOLITE. From Broken Hill, Australia. Analysis by L. G. Eakins. 59. 97 - 39.22 -63 99. 82 TERLINGUAITE. From Terlingua, Texas. See Hillebrand and Schaller, Jour. Am. Chem. Soc., vol. 29, p.1190. Analysis by Hillebrand, calculated to a gangue-free basis. Other determinations gave 88.31 and 88.92 per cent of mercury. EGLESTONITE. From Terlingua, Texas. See Hillebrand and Schaller, Jour. Am. Chem. Soc., vol. 29, p.1192. Three analyses by Hillebrand, on very small amounts of material. A. B. Cc. 88.94 89.73 8.23 8.12 1.84 1.80 98.37 | 99.01 99.65 Calculated to a gangue-free basis. KLEINITE. From Terlingua, Texas. See Hillebrand and Schaller, Jour. Am. Chem. Soc., vol. 29, p. 1181. Average of several determinations by Hillebrand, reduced to a gangue- free basis. 250 ANALYSES OF ROCKS AND MINERALS, 1880—1908. FLUORITE. From Franklin Furnace, New Jersey. Partial analysis by G. Steiger, on insufficient material. CRYOLITE. From St. Peters Dome, Pikes Peak district, Colorado. Described by Cross and Hillebrand in Bull. 20. Massive. Pinkish in color. Sp. gr., 2.972 at 24°. Analysis by W. F. Hillebrand. A oe oisteterirsmeapeisters Gs SER RC SoA RAE DOES Reins msde Bo ERAcipie CE pa miieiin De Tete Mee ee ae 12. 81 IN Beare nate areaictanavharsieteiz casas aie Sie ce Sem SAS seven vee eva yo cere ie eben atu a a chee repeiniinis (p sresisleanesecaleys 32.40 Cdsancissistieescmrcmsacre sci capamase eee Reeae eee eeUeaaeaTe trea eaRnsteedtaieree Hbs 28 AB pianos Sokhiaes isrereidieseuaie Saing, FEC kG See etmas ee toe mendes MGecauts anced 53. 55 Wey Ogu diereuaacseaieess sosalen seb cinta semmcinean 26 aes RoR OSE SERS Awd eemEeS 40 DeO evcssenic eee tadweveweesesie+d qoeieceman: Batcniomoee teas eee eRe Re ERASE . 30 -99. 74 PACHNOLITE. From St. Peters Dome, Pikes Peak district, Colorado. Described by Cross and Hillebrand in Bull. 20. Analyses by W. F. Hillebrand. A. Compact bluish variety. Sp. gr., 2.980 at 22°. B. Crystalline coating. C. Fresh, transparent, crystalline material. D. Carefully selected crystals. Sp. gr., 2.965 at 17°; 2.962 at 22°. A. B. c. D. 12.93, 12.92 | 12.14 12.27 15.27, 15.17 | 18.06 18. 04 158)) ©" rceeatbnd veal Oeenenss 10. 28 10. 23 10. 25 +13 8.64, 8.79 | 8.10, 8.11 8.05 bs sgoecvasSlajaigjctaiehcnd 51.33, 51.28 | 251.39 SiceGeateaniee leote se adauaced 99. 86 100. 00 a By difference. ELPASOLITE. From St. Peters Dome, Pikes Peak district, Colorado. Described as a new species by Cross and Hillebrand in Bull. 20. Incomplete analysis on insufficient material, by W. F. Hillebrand. The fluorine was deduced by calculation on the assumption that the metals are fully combined with it. MINERALS, GEARKSUTITE. From St. Peters Dome, Pikes Peak district, Colorado. brandin Bull. 20. Analysis by W. F. Hillebrand. PROSOPITE. 251 Described by Cross and Hille- Two samples of prosopite have been analyzed by W. F. Hillebrand, as follows: A. From St. Peters Dome, Pikes Peak district, Colorado. Described by Cross and Hillebrand in Bull. 20. Sp. gr., 2.880 at 23°. Mean of four analyses. B. Pale green, massive variety, from the Dugway mining district, Tooele County, Utah. Sp. gr., 2.87 at 21° Described by Hillebrand in Bull. 167. a Including a little quartz; undetermined. TYSONITE, From Cheyenne Mountain, near Pikes Peak, Colorado. Analyzed by W. F. Hille- brand and described by him in Bull. 167. Corrected sp. gr., 6.14 at 28°. 252 ANALYSES OF ROCKS AND MINERALS, 1880-1908. V. OXIDES AND HYDROXIDES. MANGANOSITE. From Franklin Furnace, New Jersey. Collected by ©. Palache. Analysis by G. Steiger. Sp. gr., 5.364. SiO, AlO3, and CaO absent. MONTROYDITE. From Terlingua, Texas. See Hillebrand and Schaller, Jour. Am. Chem. Soc., vol. 29, p. 1189. Analysis by W. F. Hillebrand. SPINEL. Variety pleonaste. Separated from a pyroxenite found between South Meadow and Moore creeks, Madison County, Montana. Rock described by Merrill in Proc. U.S. Nat. Mus., vol. 17, p. 659. Sp. gr. of spinel, 3.89 at 32°.3. Analysis by L. G. Eakins. GAHNITE, A. From Gilmore’s mica mine, Montgomery County, Maryland, about 12 miles north of Washington, District of Columbia. Color, bottle green. Sp. gr., 4.59. An- alyzed by T. M. Chatard and described by him in Bull. 9. B. Dysluite from Sterling Hill, New Jersey. Collected by C. Palache. Analysis by W. T. Schaller. Sp. gr., 4.56. H20 at 105°... 20 above 105° a Total Fe. bState of oxidation uncertain. ¢ Loss on ignition. MINERALS. 253 MAGNETITE. From the Gallatin Range, between Middle and Bozeman creeks, near Bozeman, Montana. Analysis by T. M. Chatard. 100. 793 - 06 100. 733 FRANKLINITE. From Franklin Furnace, New Jersey. Collected by C. Palache. Analysis by W. T. Schaller. Sp. gr., 5.09. P@20'9).ccseceeectsenesseeves cease --- 266. 58 CHROMITE. From Corundum Hill, North Carolina. Analysis by T. M. Chatard. FeO, not separately determined. RUTILE. From near St. Peters Dome, Pikes Peak district, Colorado. Sp. gr., 4.288 at 19°. Analysis by L. G. Eakins. DIASPORE. From Mount Robinson, Custer County, Colorado. Analysis by L. G. Eakins. ANO3 on6 wessece ceeemrecesatecias s de mewaisd test eREaGAeeauee teesOse eset semsinsinne sees 83. 97 GO es eseveiesnsee vip eeadeu valeteesiicw madibece sreraRneaeshee DOLE cae pe Het Sec areee eeae 15. 43 99. 40 2 State of oxidation uncertain. 254 ANALYSES OF ROCKS AND MINERALS, 1880-1908. BAUXITE. Two samples from Jacksonville, Calhoun County, Alabama. Alkalies, lime, and magnesia not looked for. Analyses by W. F. Hillebrand. BRUCITE. From Texas, Lancaster County, Pennsylvania. Analysis by E. A. Schneider. Mig Os secncincevkscceeiniisjovgys¥ Saw ane seins ce slersw ica vinci ns cme ee elas ser iememaeeeiiecieesiecs, 67.97 MO ocx Seas osregeont cuaweusans sevaenaeidce ae xwiciecrats oie div tlbiemlenesd accedecemen chink gemieciciae 97 POO gcc eard creteecrm swat sins Hoes eee deaeas cae wun eget cman ocean oesiiecneeiees 39 HMsO! 8G 10S sex jee cecteeese wnt oy siseains en be Pewee yee sacle ee nese etasmaletenieans _ 18 gOy igMmition «<2. cc.2Scnehareaee Mag rsmeciok Sipe SER OE Roe eeee eres cae eeeees 30. 63 100. 14 PSILOMELANE. From a prospect hole on plain south of Round Mountain, Silver Cliff, Colorado. Analysis by W. F. Hillebrand. There were strong spectroscopic reactions for strontia and lithia, but these bases were not estimated. A little insoluble gangue is included with the silica. H20 below 120°.............-. H20 above 120°.........-...-- HETZROLITE. From Sterling Hill, New Jersey. Collected by C. Palache. Analysis by W. T. Schaller. Sp. gr., +.85. Alz:03, CaO, and MgO absent. @ State of oxidation uncertain. MINERALS, 255 CORONADITE. New mineral from the Coronado vein, Clifton-Morenci district, Arizona. Described by Lindgren and Hillebrand in Bull. 262, p. 42. Sp. gr., 5.246 at 22° Analysis by W. F. Hillebrand. esiortea ves veler eens See u oie aaa -- 61.01 1,03 7.22 VI. CARBONATES. CALCITE. From the Gibraltar mine, Bullfrog district, Nevada. Analysis by Chase Palmer. DOLOMITE. A. Dolomite marble, New York Quarry Company, Tuckahoe, Westchester County, New York. Analysis by W. F. Hillebrand. B. Dolomite marble, Cockeysville, Maryland. Analysis by J. E. Whitfield. C. SameasB. Analysis by E.A.Schneider. Another sample. D. Dolomite marble, Webster, Massachusetts. Analysis by H. N. Stokes. E. Pink, crystallized dolomite, Joplin, Missouri. Analysis by E. T. Allen. @ Includes a little TiO2, P20, and V205. ® State of oxidation unknown. 256 ANALYSES OF ROCKS AND MINERALS, 1880-1908. SMITHSONITE, From Marion County, Arkansas. Bright yellow variety, known locally as ‘‘turkey- fat ore.’’ Analysis by H. N. Stokes. TENGERITE. From Baringer Hill, Llano County, Texas. Received from W. E. Hidden. Ap- proximate analysis, on insufficient material, by W. F. Hillebrand. Magnesia, alkalies, etc., undetermined. BASTNASITE. Associated with the tysonite of Cheyenne Mountain, near Pikes Peak, Colorado. Sp. gr. 5.12 at 27° Analyzed by W. F. Hillebrand and described by him in Bull. 167. Deposited from the waters of Owens Lake, California. Analyses by T. M. Chatard. Described by Chatard in Bull. 60. Five samples analyzed, as follows: A. The best material. Sp. gr., 2.1473 at 21.7°. B. Crude urao. C. Urao deposited upon a grass root. D. From a small lagoon. E. From a vat dug on the beach of Owens Lake. 2 Includes 0.10 ThO2. MINERALS. 257 A B Cc. D E Insoluble, inorganic........-.....-2.2... 022s eee eee eee 0.02) 0.22) 292] 0.40 4.10 Insoluble, organic. .......-...-.-.0.-2 262. ee eee ee eee thscsionaent| pects i 12 3127 SiOz... Ay etats aeteiata ACh. VII. SILICATES. PETALITE. From Peru, Maine, associated with spodumene. Analysis by F. W. Clarke. ORTHOCLASE AND MICROCLINE. A. Orthoclase from Silver City, Idaho. Occurs as a gangue mineral. Partial analysis by W. F. Hillebrand. B. Orthoclase from Mitchell County, North Carolina. Large cleavage mass. Analysis by E. T. Allen. See Am. Jour. Sci., ser. 4, vol. 19, p. 119. C. Feldspar crystal from the nevadite of Chalk Mountain, Summit County, Colorado. Analysis by W. F. Hillebrand. D. Pink orthoclase crystals, from gray porphyry, Johnson Gulch, near Leadville, Colorado. Described by Cross in Mon. XII, Appendix A. Analysis by W. F. Hille- brand. E. Feldspar separated from gabbro. East side of North Fowl Lake, Minnesota. Analysis by W. F. Hillebrand. ‘ F. Feldspar from the eleolite syenite of Litchfield, Maine. Described by Bayley in Bull. 150, p. 201. Analysis by W. H. Melville. A. B. c. D. E, F. 66. 28 . . . . 65. 14 Be wR org eoceesten os esr } cif} .2ofh 190] Bi} wav 258 ANALYSES OF ROCKS AND MINERALS, 1880-1908. G. Flesh-colored microcline from the pegmatite of Jones Falls, Baltimore, Maryland. H. Greenish microcline, same locality as G. G and H described by S. L. Powell in Johns Hopkins Univ. Circular, vol. 12, p. 49. Analyses by W. F. Hillebrand. I. Anorthoclase from the eleolite syenite of Peaked Butte, Crazy Mountains, Mon- tana. See Wolff and Tarr in Bull. Mus. Comp. Zool. Harvard Coll., vol. 16, No. 12, 1893. Analysis by W. F. Hillebrand. J. Anorthoclase from red soda granite, Pigeon Point, Minnesota. Described by Bayley in Bulletin 109. Analysis by J. E. Whitfield. K. Anorthoclase from keratophyre, Marblehead Neck, Massachusetts. Described by Sears, Bull. Mus. Comp. Zool. Harvard Coll., vol. 16, No. 9, 1893. Analysis by T. M. Chatard. ALBITE. A. From feldspathic schist, central shaft of the Hoosac Tunnel, Berkshire County, Massachusetts. Described by Wolff in Mon. XXIII, pp. 60-187. Analysis by R. B. Riggs. B, C. From the porphyritic mica schist of Greylock Mountain, Massachusetts. Described by Wolff, loc. cit. Analyses by R. B. Riggs. D. From the elzolite syenite of Litchfield, Maine. Described by Bayley in Bull. 150, p. 201. Sp. gr., 2.622. Analysis by W. H. Melville. E. From the pegmatite of Jones Falls, Baltimore, Maryland. Described by S. L. Powell in Johns Hopkins Univ. Circular, vol. 12, p. 49. Analysis by W. F. Hille- brand. F. From Amelia County, Virginia. Analysis by E. T. Allen. G. From Mitchell County, North Carolina. Analysis by Allen. 0 Oe ee eee ner } .af} arf 12h oo] 3h eo} 8 MINERALS. 259 ANORTHITE. A. From Raymond, Maine. Associated with idocrase, garnet, pyroxene, and scapolite. Analysis by W. H. Melville. B, From Phippsburg, Maine. Occurrence similar to A. Incomplete analysis by George Steiger. C. Separated from ‘‘hyperite changing to diorite,’’ near Whitaker’s ore pit, Wil- mington, Delaware. Described by Chester in Bull. 59. Analysis by R. B. Riggs. Sp. gr., 2.592 to 2.749. . SODA-LIME FELDSPARS. A. Transparent oligoclase, from Bakersville, North Carolina. Analysis by F. W. Clarke. B. Feldspar separated from porphyrite; Sugar Loaf, northwest of Elk Mountain, Tenmile district, Summit County, Colorado. Analysis by W. F. Hillebrand. Much altered. C. Feldspar separated from andesite; mesa northwest of Parkdale, Colorado. Analysis by W. F. Hillebrand. D. Feldspar separated from gabbro; Brandywine Creek, Wilmington, Delaware. Sp. gr., 2.592 to 2.877. Described by Chester in Bull. 59. Analysis by R. B. Riggs. E. Feldspar from hypersthene gabbro, Wilmington, Delaware. Sp. gr., 2.592 to 2.780. ‘Described by Chester, analysis by Riggs. F. Feldspar separated from the gabbro of Ashland County, Wisconsin. Analysis by W. F. Hillebrand. G. Feldspar separated from diabase; near southeast corner of sec. 13, T. 47 N., R. 46 W., Michigan. Described by Van Hise in Mon. XIX. Analysis by T. M. Chatard. 260 ANALYSES OF ROCKS AND MINERALS, 1880-1908. H. I. Feldspars separated from olivine diabase; NE. } sec. 13, T. 45 N., R.1 W., Wisconsin. See Van Hise, Mon. XIX. Analyses by T. M. Chatard. J. Feldspar from gabbro; southern half of sec. 14, T. 44 N., R. 4 W., Wisconsin. See Van Hise, loc. cit. Analysis by T. M. Chatard. The following feldspars were separated from Minnesota gabbros for W. 8. Bayley and analyzed by W. F. Hillebrand: K. From average gabbro, south quarter post, sec. 35, T. 61 N., R. 12 W. L. From gabbro, NW. } SE. } sec. 23, T. 62 N., R. 10. M. From gabbro, center of sec. 25, T. 64 N., R. 8. N. From gabbro, Duluth and Iron Range Railroad. O, P. Two feldspars separated from the amphibolite of Palmer Center, Massachu- setts. Analyses by W. F. Hillebrand. Specific gravity of O, 2.667 at 24°; of P, 2.677 at 22°. In O calculation gives about 7.4 and in P 7.6 per cent of admixed quartz. 15| 123 AG ticceccMacucca Seaceces TTACE: |e Sovtien nb ouioen eel ae bercen 12°83") 12.95 |-"11233'| "5183-77785 SOON | LIN eee ta ee 3:72| 3:80} 4.33 | °7/78"| "6:36 153] ~153| 268 16 254 29k 193 42 | 48 trace | trace | trace | trace trace 100. 69 | 100.28 } 100.38 | 100.51 | 100.62 LEUCITE. From Mount Vesuvius. A fine crystal. Analysis by George Steiger. SiO sian verseees acetals pisenonteunaegnotarodald needs eases del@aneseaieeeit Oodaaae acted 55. 40 Me Oseiznsnceceacuwscnsch ities dete caceasn seer erent Gaal dbeetatm teas i Sedc seed ene See ees 23. 69 CaO a's scconscmaien are neemanaeRAT es Te MaRS eat eee E ERA tee ATasdane see ee menace -16 EGO sc: scsticiccieccims dos seeicicaciati meni guna tietatess ade ei netnes ve eee aesieeaee sale coinncte 19. 54 NOG) oe cercuutelsion ce comcn cistelaiouios Sie siciacie tmredisicic st aanisindratcn ciniaiialoeinwie etna wane ate eommatee ed 1.25 Ok sieenausraics rece memaienstsiepgseermenisicint a eadarwoiveasieay se esEe ae SeeMEa ede siE 24 100. 28 ENSTATITE. A. Enstatite from Granville, Massachusetts. Slightly altered. Described by Emerson in Mon. XXIX. Analysis by W. F. Hillebrand. ; B. Enstatite separated from the San Emigdio meteorite, found in San Bernardino County, California. Analysis by J. E. Whitfield. ©. White, fibrous mineral, near enstatite, from seams in chrysolite rock, Corundum Hill, North Carolina. D. Altered enstatite, Corundum Hill. Analyses C and D by T. M. Chatard. (See Bull. 42.) Sp. gr., 2.872. E. Bronzite separated from the websterite of Hebbville, Maryland. Described by Williams in Am. Geologist, vol. 6, p. 35. Analysis by T. M. Chatard. MINERALS. 261 HYPERSTHENE. A. From the basalt of Mount Thielsen, Oregon. Incomplete analysis by T. M. Chatard. B. From gabbro, SE. } sec. 20, T. 65 N., R. 4 W., Minnesota. Described by Bayley in Jour. Geology, vol. 3, p.1. Analysis by E. A. Schneider. C. From the augite andesite of the Tokajer-Berg, Hungary. Analysis by W. F. Hillebrand. Sp. gr., 3.495 at 25°. D, E, F. Three specimens separated from the hypersthene andesite of the Buffalo Peaks, Colorado. Described by Cross in Bull. 1. Analyses by W. F. Hillebrand. In D and E alkalies were disregarded. In E and F all the iron is given as FeO. Sp. gr., of F, 3.307 at 23°. 5 PYROXENE. A. Diopside separated from the websterite of Hebbville, Maryland. Described by G. H. Williams, Am. Geologist, vol. 6, p. 35. Analysis by T. M. Chatard. B. Diopside from the leucite rocks of the Leucite Hills, Wyoming. Described by Cross, Am. Jour. Sci., 4thser., vol. 4, p.115. Sp.gr.,3.290 at 20°. Analysis by W. F. Hillebrand. C. Pyroxene from Moriah, New York. Thesource of associated serpentine. Analy- sis by Charles Catlett. D. Dark-gray pyroxene, Montville, New Jersey. The source of associated serpen- tine. Analysis by Charles Catlett. 15619—Bull. 419—10-—_18 262 ANALYSES OF ROCKS AND MINERALS, 1880-1908. E. Diallage from the gabbro of Ashland County, Wisconsin. Analysis by W. F. Hillebrand. F. Pyroxene from orthoclase gabbro, 1 mile northeast of Haystack Mountain, Liv- ingston quadrangle, Montana. Described by W. H. Emmons, Jour. Geology, vol. 16, p..193. Analysis by G. Steiger. G. Augite from nepheline basalt, Black Mountain, Uvalde quadrangle, Texas. Violet colored. Analysis by W. F. Hillebrand. H. Augite from dolerite dike, near Valmont, Colorado. See Cross, Mon. XXVII. Analysis by L. G. Eakins. I. Augite from tinguaite, Two Buttes, Colorado. Sp. gr., 3.43 at 28°. Analysis by W. F. Hillebrand. J. Pyroxene from syenitic lamprophyre, Two Buttes, Colorado. Sp. gr., 3.45 at 25°. Analysis by W. F. Hillebrand. K. Augite from granite, north end of Blue Mountains, Silver Cliff, Colorado. Sp. gr., 3.225 at 18°. Analysis by L. G. Eakins. L. Augite from the Golden King dike, Silver Cliff, Colorado. Sp. gr., 3.281 at 18°. Analysis by L. G. Eakins. M. Pyroxene from norite, dike east of Sugar Loaf, Boulder County, Colorado. Analysis by L. G. Eakins. 100.27 | 99.77} 100.16 N. Pyroxene from Italian Mountain, Gunnison County, Colorado. Associated with idocrase, scapolite, garnet, epidote, etc. Analysis by L. G. Eakins. Sp. gr., 3.312 at 16.7°, MINERALS. 268 0. Augite from basalt, 6 miles northeast of Grants, Mount Taylor region, New Mexico. Analysis by T. M. Chatard. P. Pyroxene from peridotite, east of Fort Eilis, Montana. Partial analysis by F. W. Clarke. Q. Pyroxene from basalt, east side of Bozeman Creek, 2} miles southeast of Boze- man, Montana. Described by Merrill, Proc. U. 8. Nat. Mus., vol. 17, p. 637. Analy- sis by L. G. Eakins. R. Jeffersonite from Franklin Furnace, New Jersey. Analyzed by W. F. Hillebrand and described by him in Bull. 167. 8. Jeffersonite, Parker mine, Franklin Furnace, New Jersey. Collected by C. Palache. Analysis by G. Steiger. T. Manganese pyroxene, Sterling Hill, New Jersey. Collected by C. Palache. Analysis by W. T. Schaller. R 8. T SiQg ccc eoeses sus savaeneesy ee yecueeeeece tev eeenye cages ceapeemyetneeeseegegienees 51.70} 49.03 49. 80 Alo gave xeredancucmensnislare ie sneish ae mas OceE ERE aeEcaaeS eRe DEE ek ER ETEOeES .86 26 Fe.03.. 37 4.22 1.46 RO ON oot is 2.5 18 ese ricise en alsmiadiaiains one) aoe ease eee eee el aes ce come tia 8 | cineca 3.95 1.61 MnO 7.43 7.91 9.69 MgO 12. 57 5.81 12.35 Cad. 23.68 | 19.88 21.07 PLAN ras ea arson rc eden RNR rare aia i deena SS mre aoe Barer Se See ater eons va 3.31 7.14 trace N2QO 8 ai a se cteariceisieteeisaasamsmewemacsccaeaaeacenteeekias Sees eoheEReeeeeRees oe eee 09 K.0....... sere aeerat os 2:shaislogissnmnarereavs tiace sesseuslleeneens 20 at 105°....... sue a eto eit gia eiersieieiejainiessiaraihs \ 65 -60 1.55 H20 above 105°... a eaitehvbinpsea wreiyoais shalersivielaiesineteictetinera : -70 1.31 COsscsncsnsaeenves sueneiuens axes setiv merece Pamems| pemsestnaleumenats ~43 81 99. 93 13 99.80 ZEGIRITE. Analysis by George Steiger. H20 at 100°..... H,0 above 100° 264 ANALYSES OF ROCKS AND MINERALS, 1880-1908. JADEITE. The following analyses of jadeite, all by F. W. Clarke, were discussed by Clarke: and Merrill in the Proceedings of the United States National Museum for 1888. They all represent worked material. A. Light-colored bead, mottled with Sinerilla green, from State of Oaxaca, Mexico. Sp. gr., 3.007, determined by William Hallock. B. Carved head, light green, from Zaachita, Oaxaca. Sp. gr., 3.190, Hallock. C. Fragment from Sardinal, Costa Rica; pale green, translucent. Sp. gr., 3.32, Clarke. D. Fragment from Culebra, Costa-Rica; light green, granular, opaque; quite im- pure. Sp. gr., 3.27, Clarke. Ignition. 100.01 100. 56 | 99.81} 99.69 WOLLASTONITE. Compact variety, from Diana, New York. Partial analysis by E. A. Schneider: SiO: nescncsnemsedaeagooscesaaseoawoecwas sans 50:05: (Miz Ok otis Arce jeu denen aemeremeemen ate 09 AAs O gin sisacicteicteuer tine waeacincioseuste cleanse alegisicoin se | 1.13 AO omcamanieassornine amuse sOieeweed ane sanens 45 Bej0 92 sctee ss cece ccesecedaiesemey ye caeee ; “08.82 CA Oh 4a en ciavace cee acewsanbaemaree ten atin 47.10 ; PECTOLITE. A. Stone hammer, at first supposed to be jade, collected among the Eskimo of Point Barrow, Alaska. Analyzed by F. W. Clarke, and described by him in Bull. 9. Pale apple-green, tough, compact, highly polished. Sp. gr., 2.873. B. Radiated pectolite from Bergen Hill, NewJersey. Analyzed by E. A. Schneider. C. Another sample from Bergen Hill. Analysis by George Steiger. AMPHIBOLE. A. Tremolite, pseudomorphous after sahlite; northeast slope of Canaan Mountain, Connecticut. Analysis by W. F. Hillebrand. MINERALS. 265 B. Tremolite, found in the serpentine of Easton, Pennsylvania. Analysis by L. G. Eakins. C. Actinolite (?), Corundum Hill, North Carolina. Sp. gr., 3.062. Analyzed by T. M. Chatard and described by him in Bull. 42. D. Nephrite, New Zealand. Fragment from a dark-green bowlder. Analysis by F. W. Clarke. E. Nephrite, Robenhausen, Lake Pfiffikon, Switzerland. Part of a green, com- pact, highly polished jade implement. Sp. gr., 3.015; determined by William Hallock. Analysis by F. W. Clarke. H20 above 100° CO. F. Dark-green nephrite implement, from the Eskimo of Point Barrow, Alaska. Sp. gr., 3.012. Analysis by F. W. Clarke. G. Nephrite adze, Point Barrow. Nearly black, with grayish-green patches. Sp. gr., 2.922, Hallock. Analysis by F. W. Clarke. H. Nephrite adze, Cape Prince of Wales, Alaska. Dark green, laminated in two shades, opaque. Sp. gr., 2.989, Hallock. Analysis by F. W. Clarke. I. Worked nephrite, St. Michael, Alaska. Dull apple green, fairly uniform in tint, semitranslucent at edges. Sp. gr., 3.006, Hallock. Analysis by F. W. Clarke. J. Jade implement, Diomede Island, Alaska. Dark green, laminated in two shades, opaque. Sp. gr., 3.010, Hallock. Analysis by F. W. Clarke. 57.11 | 56.01] 56.12 56. 08 2.57 1. 98 - 63 1.01 5.15 6.34 |« 7.45 7.67 11.54] 12.54] 12.72 13. 35 ae 21.38 | 21.57) 20.92 19.96 MnO. laisse trace | trace | trace trace Ignition........... = , 2.06 1.91 1.42 2.03 Alkalies... -| undet.| undet.| undet.| undet.} undet. 99.90 | 99.81 | 100.35 | 99.26] 100.10 K, L, M, N. Four samples of nephrite, found in place by Lieutenant Stoney, U. 8. Navy, near the Kowak River, Alaska. K, greenish gray, splintery-lamellar. L, like K, but more granular. M, paler, nearly white, closer grained. N, brownish, highly foliated. Analyses by F. W. Clarke. Ferrous iron determinations by R. B. Riggs. O, nephrite from Jordansmihl, Silesia; analysis by George Steiger; typical 266 ANALYSES OF ROCKS AND MINERALS, 1880-1908. material from an old locality. For details concerning nephrites D to N, see the memoir by Clarke and Merrill in Proc. U. 8. Nat. Mus. for 1888. SiO d: oc ccisscasccescceveeca sess teseresswcase ad casnsescesessae se 58.11 | 55.87 | 56.85 | 57.38 56. 39 SD WU ois ied taus crate olevsjo' ae ers slnrse weaic Ss Va sta Staats dnojasnlc late gies Beala Wtajose stalata els [ Sed ME eval gy | Aeretarerrcl Sreuarareaatall eee ares none AGO SS crareins ays cis icicats nin bea reed siiancis eras eee_emn nie siatieehe eee ciemnneee 24 2.07 88 19 1,63 Fe203. 5. 44 5.79 4.33 4. 43 1.72 FeO. 38 38 1.45 1.25 3.70 am trace | trace | trace | trace 26 OD case s,s empous rsus feces 1S oan ste hoy AMS e) ysvors he wlelatn Salo apaissais Sica |anciapese Secie [ais ed dasha | tteeserctnued chalatatersieds 13 CaO. 12.01 | 12.43 | 13.09; 12.14 7.92 MEO 8: os crechnncenmneienacougimicatesanswacaeatentsendae 21.97 | 21.62 | 21.56 | 22.71 24, 63 AION CSi cc euskaminsise ecauink (Rent ao neheeSeAata undet.| undet.| undet. | undet. none pea sms Recess dameatmaeM TES Emml eed peneece dal ccumne onl ace cans lost ete ore AE MOOT s poison iaccie aie 'spartiscreisiaisisi aia mteare coe aia ates ‘ #0 DOVE LOO? ciessisicie sic cieicraicreisisrcisizionisidte Boreistanaidancieigia ster ge eteatd } Le ti 138 } 1.76 lf 1.78 3, 42 99.93 | 99.54 99.92 | 99.83 | 100.45 P. Brown hornblende, Pierrepont, New York. Analysis by T. M. Chatard. Q. Hornblende separated from gabbro, east shaft of waterworks extension, Wash- ington, D.C. Analysis by R. B. Riggs. R. Amphibole from the serpentine of Montville, New Jersey. Analysis by L. G. Eakins. S. Hornblende separation, gedrite, from south of soapstone quarry, Warwick, Massachusetts. Analysis by E. A. Schneider. T. Hornblende from amphibolite dike, Palmer Center, Massachusetts. Sp. gr., 3.220 at 31.5° Analysis by W. F. Hillebrand. U. Hornblende from amphibolite bed, same locality and analyst. Sp. gr., 3.217 at 29°. a Admixed rutile. V. Hornblende near barkevikite. Separated from the sodalite syenite of Square Butte, Highwood Mountains, Montana. Described by Lindgren in Am. Jour. Sci., 3d ser., vol. 45, p. 286. Analysis by W. H. Melville. W. Amphibole separated from quartz diorite, south of Table Mountain, on ridge between Butte and Plumas counties, California. Described by Turner in,17th Ann., pt. 1, p. 521. Analysis by William Valentine. Chromium determination by Hille- brand. : MINERALS, 267 X. Amphibole separated from amphibole gabbro, Beaver Creek, Big Trees quad- rangle, California. Analysis by William Valentine. See Bull. 168, p. 206. Y. Amphibole separated from quartz monzonite, Tioga road, southeast of Mount Hoffman, Mariposa County, California, Sp. er., 3.203 at 21.5° Analysis by W. F. Hillebrand. See Bull. 168, p. 208. Z. Amphibole separated from the granite of Butte, Montana. Incomplete analysis for lack of material. Analysis by H. N. Stokes. BERYL. A. White beryl from the tin mine at Winslow, Maine. Opaque, milky, associated with mica, fluorite, calcite, tinstone, etc. Sp. gr., 2.707 at 27°. Analysis by W. F. Hillebrand. B. Green beryl from near Home post-office in eastern Tennessee. Analysis by F. W. Clarke. NEPHELITE. “A. Eleolite from Litchfield, Maine. Dark-gray cleavable masses, of greasy luster. Described by F. W. Clarke in Bull. 42. B. Another sample from Litchfield. Analysis by George Steiger. C. Nephelite extracted by solution from the elolite syenite of Red Hill, New Hampshire. Described by Bayley in Bull. Geol. Soc. America, vol. 3, p. 231. Analysis by W. F. Hillebrand. 268 ANALYSES OF ROCKS AND MINERALS, 1880-1908. CANCRINITE. . All from Litchfield, Maine. See description by Clarke in Bull. 42. A. Pale yellow, granular. B. Bright orange-yellow, cleavable, transparent in thin fragments. C. Dingy pale yellow, otherwise like B. D. Average yellow sample. E. Flesh-colored, cleavable mixture of eleolite and cancrinite. Analysis D by George Steiger; the others by F. W. Clarke. CO, determinations in A, B, C, E by R. B. Riggs. SODALITE. A. Blue sodalite, from Litchfield, Maine. Analysis by F. W. Clarke. See descrip- tion in Bull. 42. B. Blue sodalite, from Ice River, near Kicking Horse Pass, British Columbia. Analysis by George Steiger. C. Sodalite separated from the sodalite syenite of Square Butte, Highwood Moun- tains, Montana. See Lindgren in Am. Jour. Sci., 3d ser., vol. 45, p. 286. Sp. gr., 2.265. Analysis by W. H. Melville. MINERALS. 269 ZUNYITE. From the Zufii mine, Anvil Mountain, near Silverton, Colorado. Analyzed by W. F. Hillebrand, and described by him as a new species in Bull. 20. Sp. gr., 2.875 at 15°. BIO gsc teres seen stele ialarsiciaie tabrecoeicrsdaw ASO N | SE cigs aid cnesr cacy cna tac cic ke Shs vaya us aides aloceaajeparendsnveus wisrsieus 5. 61 MOOR ac ceaceOS Seamaceycens to emeannawes ZO} OM oye eco reed von yah oscices etaceteesioie!epcinat bse Hleemic)tiesscicye 2.91 eee at Rey on sca a 102. 76 INR Ome eects eevee ee aces! “94 O equivalent to F and Cl..............-..-- 3.02 We1gO) jp sc.cari gem nasis ey carr necisicien aarinejs.asiseate trace 99.74 TsO peesepeemicwecinostrstcicinicieasteaemen baeltage siete 10. 89 PsObesveriseecisnsxeeracseesexeane ee Seaeeeusr . 60 GARNET. A. White grossularite, 35 miles east of Selma, Fresno County, California. Analysis by George Steiger. Sp. gr., 3.586. B. Grossularite. Large waterworn pebble, pale green, very compact. At first, thought to be jade. From Eltoro, 40 miles south of Los Angeles, California. Described by Clarke in Am. Jour. Sci., 3d ser., vol.50,p.76. Analysis by Steiger. Sp. gr., 3.485. C, D, E. Three samples of garnet from Italian Mountain, Gunnison County, Colo- -rado. Sp. gr.: A, 3.72 at 16°; B, 3.629 at 23°; C, 3.721 at 17.2°. Analyses by L. G. Eakins. F. Pyrope from the peridotite dike of Elliott County, Kentucky. Described by Diller in Bull. 38. Analysis by T. M. Chatard. G. Garnets from Hawkes’s quarry, Goshen, Massachusetts. Almandite. Analysis by Steiger. 2 H20 at105°.... H20 above 105°. H. Spessartite from Amelia Court House, Amelia County, Virginia. Pale brown, crystalline masses. Analyzed by F. W. Clarke and described in Bull. 60. I. Spessartite from Llano County, Texas. Yellow, granular. Analyzed by W. H. Melville and described in Bull. 90. FeO could not be separately determined. J. Spessartite from cavities in rhyolite, Nathrop, Colorado. Brilliant crystals. Sp. gr., 4.23 at 18°. Described by Cross in Am. Jour. Sci., 3d ser., vol. 31, p. 482. Analysis by L. G. Eakins. K. Garnet from the Peacock mining claim, Seven Devils mining district, Idaho. Associated with bornite and powellite. Analyzed by W. H. Melville and described in Bull. 90. L, M. Two samples andradite from Clifton, Arizona. Analyses by George Steiger. N. Andradite, from the Jumbo mine, Copper Mountain, Prince of Wales Island, Alaska, Analysis by W: T. Schaller. 270 ANALYSES OF ROCKS AND MINERALS, 1880-1908. H20 at 100° H20 above 100° CHRYSOLITE. A. Transparent green pebbles from near Fort Wingate, New Mexico. Analysis by E. A. Schneider. B. Transparent olivine from the meteorite of Kiowa County, Kansas. Described in Bull. 78. Sp. gr., 3.376 at 23.2°. Analysis by L. G. Eakins. C. Olivine from the peridotite dike of Elliott County, Kentucky. Described by Diller in Bull. 38. Analysis by T. M. Chatard. D. Olivine from the peridotite at Riddles, Oregon. The rock is the matrix of nickel silicates. Described by Diller and Clarke in Bull. 60. Analysis by F. W. Clarke. E. Olivine from olivine gabbro, west side of Birch Lake, Minnesota, Described by Bayley, Jour. Geology, vol. 1, p. 688. Analysis by W. F. Hillebrand. F. Olivine separated from the ‘‘hampshirite” of Chester, Massachusetts. Analysis by W. T. Schaller. 100.11 | 99.85 | 99.42 | 99.36 | 100.25} 100.10 WILLEMITE. In fine needles, from the Tres Hermanas mine, New Mexico. Collected by W. Lindgren. Analysis by G. Steiger. Mineral not quite pure. Contains admixed carbonates. MINERALS. Q71 FRIEDELITE. From the Taylor mine, Franklin Furnace, New Jersey. Collected by ©. Palache. Analysis by W. T. Schaller. MIZZONITE. From a gulch on the side of Italian Mountain, Gunnison County, Colorado. Analy- sis by L. A. Eakins. VESUVIANITE. A. Finely crystallized material from Italian Mountain, Gunnison County, Colorado. Analysis by L. G. Eakins. Sp. gr., 3.394 at 20°. B. From Nevada, 24 kilometers northeast of Silver Peak. Analysis by George Steiger. C. Pale green, massive. South Fork of Indian Creek, 12 miles from Happy Camp, Siskiyou County, California. Analysis by Steiger. D. From 35 miles east of Selma, Fresno County, California. Green, massive, resembling jade. This variety is known as californite. Analysis by Steiger. Sp. gr., 3.359. E. From Franklin Furnace, New Jersey. Collected by C. Palache. Analysis by Steiger. Sp. gr., 3.451. = 100.25 | 99.56 |....-... 100.21 | 100.08 272 ANALYSES OF ROCKS AND MINERALS, 1880-1908. ZOISITE. A. Zoisite from gabbro, east shaft of waterworks extension, Washington, D. C, Analysis by F. W. Clarke; iron determination by R. B. Riggs. B. Rose-red zoisite, James’s mica mine, Yancey County, North Carolina. Sp. gr., 3.352 at 27°. Analysis by L. G. Eakins. C. Saussurite from gabbro, Sacramento River road, 37 miles north of Pit River ferry, Shasta County, California. Sp. gr., 3.148. Analysis by F. W. Clarke. See Bull. 9. D. Saussurite from the Saas Valley, Switzerland. Pale greenish. Sp. gr., 3.37. Analysis by F. W. Clarke; iron determination by R. B. Riggs. 99.16 | 100.21 | 100. 33 | 99. 81 EPIDOTE. A. Dark-gray brilliant crystals from Phippsburg, Maine. Analyzed by W. F. Hillebrand and described in Bull. 167. B, C. Epidote from Italian Mountain, Gunnison County, Colorado. Sp. gr.: B, 3.448 at 25°; C, 3.452 at 17°. Analyses by L. G. Eakins. D. From Shasta County, California. Analysis by W. T. Schaller. A B. Cc D S1Ogs je renediomedesittan ohenstdeaulaldislsawlodeginciinssneteebewinoredioaeeice® 38. 22 ARNO acca tes caetna he eva aa ware erceae ie Seas lun ts Ae enue hraeeaeeaeats usa an eamimatenses 25.12 Feo. 135 eO_. i Mno. -19 MgO. trace CaO .. 22. a Nas sc securmcevaspersersasesneccks sey eainae oie iaeteteseweemena neeqerren:s . KO ccs n5 ssiocpic esse axwinaacciake nk cee eae ss an eeaee naesimstnebne see cs - 06 H20 at 105°. ... 52 H20 above 105° 3.04 TiOsg.... sicie 33 PIEDMONTITE. From the rhyolite of Pine Mountain, near Monterey station, Maryland. Contains a little admixed quartz. Analysis by W. F. Hillebrand. MINERALS. 273 ALLANITE. From Platte Mountain, Douglas County, Colorado. Sp. gr., 3.52 at 29°. Analysis by L. G. Eakins. See Proc. Colorado Sci. Soc., vol. 2, p. 32. PREHBNITE. A. From Paterson, New Jersey. Analysis by G. Steiger. B. From Franklin Furnace, New Jersey. Collected by C. Palache. Analysis by Steiger. Sp. gr., 2.965. C. From Smiths Mountain, near Oak Grove, San Diego County, California. Sp. gr., 2.895 to 2.909. D. Crystals from C. Analyses C, D, by W. T. Schaller. E. From Fassa, Tyrol. Analysis by E. A. Schneider. A B Cc. D E Si OD -icieicferatsiomsisinicte ataidiatnertrciarete tei sielsea eters ia tisinderoiems nein ete any 42. 31 AGO 3 sso 5 cewekeerewse ser sg eeeeeesredesweseseeeedieessexeee 19. 95 FeO 9 sie.cs cos ssegassiecesesssseweresaenmeeee sess sescsacee ay 6. 20 FOO). siccjacinte ite Meets Siac anes arenes Seseens- BU Meceebawabee none CaO... 26. 63 "MgO none IN 82O sciars Aenean tieciantoreSanan aon cniotmainne te eeaesins eS eEe naa acireisiesl RO sjcsccccmsoaacecteew aweisinas ne sistemas s xeie's aiesarmnieeiasieiainiens dis lleareva'aie-al ae = a sat s 21 “ 3OF AG 250 $300 reas werent om rereicernetrenectaiarateireisiotim ret aaiciagm meee H.0 by ignilionssoc.occceca:scescescreeroentssesseseaneseenee Hi 4.81 \ 4.85 100.11 | 100.19 | 100.02 | 100.58 | 100.32 TOPAZ. A. White, opaque topaz from Stoneham, Maine. Sp. gr., 3.51. B. Alteration product of A, greenish. Sp. gr., 3.42. Analyses A and B by J. E. Whitfield. See discussion by Clarke in Bull. 27. C. Topaz from Florissant, Colorado. Sp. gr., 3.578 at 22° Analyzed by W. F. Hillebrand, and described in Bull. 20. 107.97 | 106.40 | 106.20 7.16 5. 42 6.75 100. 81 | 100. 98 99. 45 274 ANALYSES OF ROCKS AND MINERALS, 1880-1908. The final alteration of the Stoneham topaz is into muscovite, q. v. The alteration product here given represents the beginning of the process. SILLIMANITE. Fibrolite adze from Brittany. Sp. gr., 3.147, determined by William Hallock. Analysis by F. W. Clarke. See Bull. 60. KYANITE. . Pale-green variety, associated, with the dumortierite of Clip, Arizona. Analyzed by W. F. Hillebrand. Titanic oxide is present in appreciable amounts, but was not separated from alumina. The mineral contained a few black, nonmagnetic grains, which may have carried the titanium. Sp. gr., 3.656 at 18.5° ILVAITE. From Golconda mine, South Mountain, Owyhee County, Idaho. Analysis by W. F. Hillebrand. Sp. gr., 4.059 at 31°. \ CALAMINE. White, highly crystalline. From Sterling, New Jersey. Steiger. FEgO BELO sa nrcasesnananne H20 above 100° LAWSONITE. From Tiburon Peninsula, California. Collected by F. L. Ransome. Analysis by W. F. Hillebrand. MINERALS. 275 STAUROLITE. _ Altered staurolite from Liberty Grove, Cecil County, Maryland. About two-thirds muscovite. Analysis by George Steiger. DOSLT Nag Ol} ciratssicisis crarecmaihasteanticeniat peciiresy 0. 48 eB: || gO at 100° 2:3 56.cememosad macnn dwesunaceueee - 42 27.97 | HsO above 100° 2102. cece ssveseuscceaeeexees 3. 94 Ge13s |. PsOps cxssccccneecucansine sleeneseaeeeeens 06 1s mo 7.77 GADOLINITE. Analyses by L. G. Eakins. A. From Llano County, Texas. Sp. gr., 4.239 at 17.4°. B, C. From Devils Head Mountain, Douglas County, Colorado. Specific gravities: B, 4.56 at 179; C, 4.59 at 25.5°. Described in Proc. Colorado Sci. Soc., vol. 2, pt. 1, p. 32. trace |........ 11 11. 33 7.19 5. 46 74 34 47 trace -14 -16 trace -18 - 20 trace = 28 ~32 1.03 - 86 74 SOS) epesstcictcha beers nciacny= 100. 29 | 100.48 | 100. 02 @ Molecular weight, 260. > Molecular weight Y, Er group: in B, 296; in C, 294. YTTRIALITE. From the Baringer mine, Llano County, Texas. Analyzed by W. F. Hillebrand, and discussed in Am. Jour. Sci., 4th ser., vol. 13, p. 145. SW wtiprsct itn aang cealai gic eotape ink aa aan ataiain Ue 9 cc we cries ema ananssneigumncunadund 0.80 i . 67 .16 32 . 04 LaO3 group, mol. wt., 335.6........-.-.---- StABY | (COs. cc ccicenecoaure sce at eubaoaeeceacecades al Y203 group, mol. wt., 265.8... BAG Pe ausnccmanicamaneasneseovndoianeey 28e5 12 ROI Oper Seciaicasnuieesieata re eecmasenaadas .76 | A, He, F, and alkalies by difference........ 31 TOO ricco tetra hate ation taper e 1.90 100. 00 276 ANALYSES OF ROCKS AND MINERALS, 1880—1908. ROWLANDITE. From Llano County, Texas. Analysis by W. F. Hillebrand, with discussion in Bull. 113. Sp. gr., 4.513 at 15.5°. 1.62 +28 24 34 La2O3 group, mol. wt., 336.8...............- O84 Es a veges os seieicecinsieh mie acened eee Rage 3. 87 Yt2O3 group, mol. wt., 266.2.... : Fe203 tp age ue ace gdh a anc ph eta EO) esssahuavecucsua int seeeeerecee Mi Ore ceneenecaaseceecnc seems C8 Od sscmustssnavieisisecs¥dacech ce deamiseesecin MACKINTOSHITE. From Llano County, Texas. Analyzed by W. F. Hillebrand and discussed in Bull. 113. Sp. gr., 5.43 at 21.4°. Only nine-tenths of a gram available for analysis. CYRTOLITE. A doubtful mineral from Devils Head Mountain, Douglas County, Colorado. Analy ses by W. F. Hillebrand, with description in Proc. Colorado Sci. Soc., vol.3, pt.1, p. 44. Brown crystalline growths of irregular form. Sp. gr.: A, 3.70; B, 3.60; C, 3.64. The material may be a mixture of cyrtolite or some analogous alteration of zircon with limonite and a phosphate. A B. Cc. 20. 64 19.21 71 - 03 51. 00 47.81 1.20 60 4.76 4,55 2. 48 3.13 5.97 4. 86 .57 33 1.93 2.15 SL, lpochowervens -10 -17 -50 «42 12. 00 12.97 1,75 93 2 42 100.04 | 100.98 | 100.74 ¢ A mixture of indefinable earths with some uranium and a trace of titanium. MINERALS. 277 DANBURITE. From Russell, New York. Analysis by J. E. Whitfield. See Bull. 55. S109 aca pannns casmmesus nex eucist sasuingncieeneslameue and yekaninisanseaaumssteevancmesesedes 49.70 BBO sees se setesrti eo ate coete gemma 5S oo cannabis bast mc farecenaenatenctorsertetcisthesaleod 25. 80 Ce Oates er Secesnet ae geteh dysge sc = pop nd eee scp srersmrenarcoiot ose tocol icteschormcle Shlcheesate 23. 26 B03 03 Aa Og se eras eeorcpererate 2 2 ctesge was decree ynatatsiccarcasictcheaiw omeratocelotovesciadsnce usta. esctle'seceateoorencs 1.02 TIL GEORG ish ate es cartons acc uepes vb kerstc eda cnet ockcel cect ional carob denice lances 0. 20 99. 98 DATOLITE. From Bergen Hill, New Jersey. Analysis by J. E. Whitfield. See Bull. 55. Bi Oa actors atcirciesinastneistns slater eee loan omits at eeu auseuey pieanewaubun 35.74 HB Og sc caz chats nse cboverecchoie researc Weg dhadva dain aoe eae Seca tae eemicetera task 22. 60 RO ase sce ha ten i tae aaah etn usesann ensign Bete ad oe aPR Cat a 35. 14 WOO casas crvarg wieerensnmrreiewre NER nicincmiaincinccinienasiid oe cocuveeabere nd Seyarciensess gee Rlavvcesoneial eeeerensuts se 31 Tg ©) spsteseen reach cicadas osct emer ance ceheartck neces oce eer uageenteacenteicievaiora niche meee 6.14 99. 93 AXINITE. Analyses A, B, by J. E. Whitfield, with discussion in Bull. 55. A. Clove brown, from Cornwall, England. Translucent. B. Pearl gray, from Bourg d’Oisans, Dauphiny. Transparent. C. From Moosa Canyon, Bonsall, San Diego County, California. D. From Consumnes copper mine, Amador County, California. Analyses C, D, by W. T. Schaller. 17. 43 16. 38 a BONlesaseeers 7.53 4, 22 19. 74 19, 21 4.10 8.76 44 - 09 6.04 | @6.70 1. 56 1.85 99.83 | 100.00 a By difference. DUMORTIERITE. A. Harlem, New York. Analysis by R. B. Riggs. See Am. Jour. Sci., 3d ser., vol. 34; p. 406. Contained some tourmaline. B. Harlem, New York. Analysis by J. E. Whitfield. C. Near Clip, Yuma County, Arizona. ‘ Analysis by J. E. Whitfield. D. Purified sample from Clip. Analysis by Whitfield. Specific gravity a little over 3.265. See note by Whitfield in Bull. 60, and paper by Diller and Whitfield in Bull. 64. E, F. Two samples from Dehesa, San Diego County, California. 15619—Bull. 419—10——19 278 ANALYSES OF ROCKS’ AND MINERALS, 1880—1908. G. North fork of Washougal River, Skamania County, Washington. Analyses E, F, G, by W. T. Schaller, and discussed by him in Bull. 262. a Loss on ignition. TOURMALINE. LITHIA TOURMALINE. Analyses A to H, inclusive, by R. B. Riggs. Discussed by Riggs in Bull. 55. A. Pink center of crystals having a green margin, from Calhao, province of Minas Geraes, Brazil. Sp. gr., 3.028. B. Pale green, border of A. C. Olive green, also from Calhao, Brazil. D. Rose colored, massive, from Black Mountain, Rumford, Maine. Sp. gr., 2.997. E. Dark green, massive, same locality as D. 15 PBL lactones none 2. 29 3.19 26 6. 43 1. 47 2. 22 35 32 none - 04 -07 none 49 38 z 34 1.71 1.61 1. 59 95 2. 42 2. 70 2.18 2. 86 25 28 44 38 trace -l1 |} none trace 10. 29 9. 87 9. 99 10. 22 3. 63 3. 64 4. 26 3. 52 32 14 28 16 100.06 | 99.53 | 100. 29 99. 81 -13 - 06 -12 07 seal hectare 99.93 | 99.47 | 100.17 99. 74 I. Colorless to very pale pinkish or greenish crystals, Auburn, Maine. Sp. gr., 3.07. G. Light-green crystals, Auburn, Maine. H. Dark-green, massive tourmaline, Auburn, Maine. I. Pink, Mesa Grande, San Diego County, California. J. Pale green, Mesa Grande. K. Pale-rose color, Island of Elba. Sp. gr., 3.04-3.05. Analyses I, J, K, by W. T. Schaller. Titherto unpublished. MINERALS. 279 100.28 | 99.77 | 99.76 | 100.01 . 80 1% -13 - 04 99.98 | 99.60 | 99.63 99. 97 The following analyses represent alteration products of lithia tourmaline: L. From the Rumford rubellite. M. From the rubellite of Hebron, Maine. N. Pink tourmaline, Pala, San Diego County, California, partly altered. O. Tourmaline N, almost completely altered. Analyses L, M, by Riggs; N, O, by Schaller. a By difference. MAGNESIAN: AND IRON TOURMALINES,. Analyses A to L by R. B. Riggs. See Bull. 55. A. White to light-brown crystals, Dekalb, St. Lawrence County, New York. Sp. gr., 3.085. B. Brown tourmaline, Gouverneur, St. Lawrence County, New York. C. Cinnamon-brown crystals, Hamburg, New Jersey. D. Brilliant black crystals, Pierrepont, St. Lawrence County, New York. Sp. gr., 3.08. E. Dark-brown crystals, Orford, New Hampshire. F. Dark-brown crystals, Monroe, Connecticut, 280 ANALYSES OF ROCKS AND MINERALS, 1880-1908. G. Massive black tourmaline, Auburn, Maine. Sp. egr., 3.19. H. Massive black tourmaline, Paris, Maine. I. Black tourmaline, Calhao, Brazil. Sp. gr., 3.20. J. Black tourmaline, Haddam, Connecticut. K. Black crystal, Nantic Gulf, Baffin Land. Sp. gr., 3.095. L. Black crystal, Stony Point, Alexander County, North Carolina. Sp. gr., 3.13. M. Brown tourmaline from near Colfax, Nevada County, California. Fine, radi- ating needles. Sp. gr., 3.065. Incomplete analysis by W. H. Melville. See Bull. 90. N. Chrome tourmaline from near Etchison, Montgomery County, Maryland. Analy- sis by T. M. Chatard. See Bull. 64. O. Black tourmaline, Lost Valley, San Diego County, California. P. Black tourmaline, Ramona, San Diego County, California. Analyses O, P by W. T. Schaller. Hitherto unpublished. MINERALS. 281 @ Tis03. + By difference. GYROLITE. A. Associated with the apophyllite of New Almaden, California. Fibrous. Ana- lyzed by F. W. Clarke and described in Bull. 64. B. From Fort Point, San Francisco, California. Analyzed by W. T. Schaller, and described in Bull. 262. APOPHYLLITE. From Table Mountain, Golden, Colorado. Described by Cross and Hillebrand in Bull. 20. Analyses by W. F. Hillebrand. A. Apophyllite. B. Decomposition product of apophyllite. Oequivalent to F. 2.2. 2. -2.22s erence erect eee eee s senna ees scenenen aren ccnrn sss ctmenecs a By difference. 282 ANALYSES OF ROCKS AND MINERALS, 1880-1908. PTILOLITE. Described as a new species by Cross and Eakins in Am. Jour, Sci., 3d ser., vol. 32, p. 117, and vol. 44, p. 96. Analyses by L. G. Eakins. A. From Green Mountain, Jefferson County, Colorado. B. From 3 miles south of Silver Cliff, Custer County, Colorado. ' A B. BL Bosco waa hcscsc acs Sd ccrargobed Ged sid a dep deciad aideied Hel vensToa nade Stbialealehass ecu iacgtanlel 70. 35 67. 83 IVR O ae cists Sas ssieseccie 11.90 11. 44 Oasys encescacetond ae la veda Estee lub Geenrn Siem ie ie SEI Sinise AVES TROIS AE rae ermdale reactor 3. 87 3. 30 K20 2. 83 . 64 Na2O....- SU 2. 63 HO at 110° 3. 62 H20 at 125° 10.18 1.31 H20 at 300°. . 2 ‘ 5. 41 FO sab TC NESS ogre ees pepsi naire anus Ric FiciesnBiSicinie ih Hk weenie see Salen winie saree aie exes 3.10 99. 90 99. 28 HEULANDITE. A. From Green Mountain, Jefferson County, Colorado. Analysis by L. G. Eakins. B. From Anthracite Creek, Gunnison County, Colorado. Analysis by L. G. Eakins. Sp. gr., 2.24 at 20.1°. C. From Berufiérd, Iceland. Analysis by George Steiger. A B. Cc S10 8sc.ccceweee 59.17 | 57.38 57.10 Al2O3- 16.80 | 17.18 16. 82 FRO 2 Oboe x seeseeg staan ak a a ss Paces Bini oes ie Gin saci iS eieicloas wi oesk oie Suni giRIENS aig Ss ERE eIAs fae trate | ssc -25% SN Oh ao 05 nce eimai tc ssa casa dbI RIE #HEG Lad Wisi che ease GS SIRSIE Snel epe Rages | SIS isIE lew 07 OOK foie ies atiaachal ccrcnaliss lessen ass oiesesn San brdlebebal ease ensalelsler oo adapta nae iaaaaceane 7.10 8.07 6.95 Tyas dsgh hcg coc venenatis asad cgeaetcnans laf pica aia GVO iatoaeed oem CD Pate SE | SOeueeeae See ee 46 Na2O........ es sees bead a patetmeeceatauesen 1.37 - 82 1.25 es Oho dine tate daae we eeeIeR See cen shia stare ain re intaas 84 - 40 +42 sO at 00 ecm neaeeysiscavsvereios ei — aictats asaprararsaseor gare Sriasansse ) 2. 57 3.61 H20 at 125°... . fs 15. 45 1.10 H20 at 300°... .. eis 11.70 13.00 HaO at redness........ sales sey ents sata foie rig hwmle sare -90 100. 23 | 100. 12 99. 68 STILBITE. A. From Wassons Bluff, near Parrsboro, Nova Scotia. Analysis by George Steiger. B. From Italian Mountain, Gunnison County, Colorado. Analysis by L. G. Eakins. C. From Table Mountain, Golden, Colorado. Described by Cross and Hillebrand in Bull. 20. Analysis by W. F. Hillebrand. 57. 75 54. 67 trace 1. 3 \ 17.17 i 19.16 TTS V O00 cee cece wee seccle ncn ese eks were enor eaacie ee cen TT) 15.41 100.51 | 100.14 | 100.06 MINERALS. 283 LAUMONTITE. From Tsble Mountain, Golden, Colorado. Described by (ross and Hillebrand in Bull. 20. Analyses by W. F. Hillebrand. A. Yellow grains. B. White crystals. CHABAZITE. A. From Wassons Bluff, near Parrsboro, Nova Scotia. Analysis by George Steiger. B, C. From Table Mountain, Golden, Colorado. Described by Cross and Hillebrand in Bull. 20. Analyses by W: F. Hillebrand. A B, Cc BIO gate cts rcccinsetchs wcctesare saree a sieidisicroreeete els crecererciecretdhersscre grange Srotarmeactdiave claret grate emarsarnodcheels 47. 86 47.18 ALGO S- sesoresicets: snrorequaninnineencenginesereeeee eeeeexedes 19. 30 19. 67 PepOgic-vcoseeecesansceeeerecmeeerterseameeeeeecese AO cies aiesis MPO Fecaxee coupe rok kee SS a SNES aes plone deaackeasekkecwcensal|| SOF geen eects CaO... 9.94 9. 74 STO ajow Berd ineercanqeicaleecioreisarsgidarecercictim aoeU ne odtiee Amer em anes ARES ANE a EGneR loaded - 43 Na,O b2 -51 K.0... 73 +85 237 H20 at 100°. . ee 5. 22 \ 22.07 4.76 The OAL OVE LOE irate cnc 5 tay cere etesaveciveneeaesareiate:Sheialaoznacacetoisies havartheremictaid\ebaaraierensgie be wa aqioeted 16. 63 f 17.39 LEVYNITE, From Table Mountain, Golden, Colorado. Described by Cross and Hillebrand in Bull. 20. Analyses by W. F. Hillebrand. A. Crystals of levynite. B. Associated fibrous variety. ANALCITE. A. From Wassons Bluff, near Parrsboro, Nova Scotia. Analysis by George Steiger. See Bull. 207. B. From Table Mountain, Golden, Colorado. Analysis by George Steiger. See Bull. 207. 284 ANALYSES OF ROCKS AND MINERALS, 1880-1908. ©, D. From Table Mountain. Described by Cross and Hillebrand in Bull. 20. Analyses by W. F. Hillebrand. iO arccemeasr eclacchn tracaconereetars pate eierem chara aerate aeohohe nasene cia end bral Gee aioe 57.06 | 55.72 | 55.82 55. 80 Di Gasy thee eausen sama wee < et ae 99.99 | 99.80 | 100.10 | 100.05 NATROLITE. A. From Bergen Hill, New Jersey. Analysis by George Steiger. See Bull. 207. B. From Magnet Cove, Arkansas. Analysis by W. H. Melville. Described in Bull. 90. Sp. gr., 2.261. C. From South Table Mountain, Golden, Colorado. Described by Cross and Hille- brand in Bull. 20. Analysis by W. F. Hillebrand. a By difference. Too little material for complete analysis. Calculated to satisfy total lime. SCOLECITE. A. From Whale Cove, Grand Manan, New Brunswick. Analysis by George Steiger. See Bull. 207. B. From Italian Mountain, Gunnison County, Colorado. Analysis by L. G. Eakins. Sp. gr., 2.247 at 17.2°. C. From Table Mountain, Golden, Colorado. Described by Cross and Hillebrand in Bull. 20. Analysis by W. F. Hillebrand. 2 H20 at 100°. ... H20 above 100°. a By difference, MINERALS. 285 MESOLITE. A. From North Table Mountain, Golden, Colorado. Described by Cross and Hille- brand in Bull. 20. Analysis by W. F. Hillebrand. B. From Osteré, Faroe Islands. Analysis by G. Steiger. THOMSONITE. From Table Mountain, Golden, Colorado. Described by Cross and Hillebrand in Bull. 20. Analyses A, B, C, D, Eby W. F. Hillebrand. Analysis F by George Steiger; published in Bull. 207. A represents reddish spherules; F, a mass of fibrous structure. : A B Cc D. E F S10 gi scesecusesceresnoracesseuddarones smeEeeee ees 40.52 | 41.88] 40.68] 41.21 | 42.66 41.13 AlO3 29. ae J.68 | 30.12 | 29.71 | 29.25 29. 58 Fe,0. AOD Nesey che tass tess lai 2sin/ 532. ll e251, 2)ains | alsa nto, 2al side cewle Ca0.. 12.43 | 11.88] 11.92] 11.34] 10.90 11. 25 20 sie 4.31 4.72 4,44 5. 62 4,92 5.31 2 TO above Ii 2 ert teeeeens) igo fa | ies it ian aes | ab oe 100.06 | 100.07 | 100.02 | 100.08 | 100.01 | 100.40 HYDRONEPHELITE. From the elzolite syenite of Litchfield, Maine. Described by Clarke as a new species in Bull. 42. Analyses by F. W. Clarke. Sp. gr., 2.263, determined by J. S. Diller. A, B. Slightly impure. Two distinct samples. C. Carefully purified material dried at 100°. A B. Cc 39. 24 38.99 33. 16 33. 62 TPACE! | ses ck trace 07 13.07 13.07 88 1.12 13. 30 12.98 100.27 | 99.65 99. 85 MUSCOVITE. A. From the Hatch farm, Auburn, Maine. Broad plates, bordered by lepidolite. Analysis by R. B. Riggs. B. Greenish muscovite, Auburn, Maine. Analysis by E. A. Schneider. C. Altered muscovite, Mount Mica, Paris, Maine. Occurs as a white enamel on ordinary mica. Analysis by F. W. Clarke. D. Well-crystallized muscovite from the hiddenite mine, Stony Point, Alexander County, North Carolina. Analysis by F. W. Clarke. E, White muscovite from Miask, Ural Mountains, Siberia. Analysis by E. A. Schneider. 286 ANALYSES OF ROCKS AND MINERALS, 1880-1908. F. Mica separated from quartz schist. Shoemaker’s quarry, near Stevenson sta- tion, Green Spring Valley, Maryland. Analysis by E. A. Schneider. G. Mica from the Eureka tunnel, St. Peters Dome, near Pikes Peak, Colorado. Analysis by W. F. Hillebrand. See Bull. 20. H. Pink muscovite, Mesa Grande, San Diego County, California. Analysis by W. T. Schaller. I. Muscovite associated with the dumortierite of Skamania County, Washington. Analysis by Schaller. 101.13 | 99.63 | 99.34 | 100.27 | 100.88 | 100.31 | 99.31 | 99.89] 100.68 30 9 37 OD oc eriicred 202) | spews 100::83: |s:svisinea | sear ae 99.98 | 100.51 | 100.22 |........ 99. 57 |.......- J. Fuchsite. Etchison post-office, Montgomery County, Maryland. Analysis by T. M. Chatard. See Bull. 64. : K. Grayish-green, compact mica from Stoneham, Maine. Structure subfibrous. Analysis by T. M. Chatard. L. Same locality as I. Specimen broadly foliated, micaceous. Analysis by T. M. Chatard. For analyses I and J see Bull. 9. M. Stoneham, Maine. From alteration of topaz, the outer portion of an altered crystal. Sp.gr., 2.82. Analysis byJ.E. Whitfield. Discussed by Clarke in Bull. 27. N. Pseudomorph from the Rochelle mine, on Running Water River, Wyoming. Near liebenerite. Sp. gr., 2.831 at 12.5°. Analyzed by W. F. Hillebrand and de- scribed in Bull. 20. ; O. Mariposite. From vein of the Josephine gold quartz mine, Bear Valley, Mari- posa County, California. Color, green. Sp. gr., 2.817 at 29.5°. P. White mariposite, same locality as M. Sp. gr., 2.787 at 28.5° Analyses M and N by W. F. Hillebrand, and described in Bull. 167. , Osequivale nt fo: x .csssmzaictretencistove cieivicnsta sie ote 2 |aretnatna aallnaerstoeaaleatenecen AB! | oa ccreretsercs| arace crawl ea siernre vin MINERALS. 287 LEPIDOLITE. Micas A to G from various localities in Maine. Analyses by R. B. Riggs. Discus- sion by I. W. Clarke in Bull. 42. A. From Black Mountain, Rumford. Lilac-purple, granular. B. From Mount Mica, Paris. Broadly foliated. C. From Hebron. Purple, coarsely granular. D. From Auburn. Purple border on plates of muscovite. E. From Auburn. Purple, coarsely granular. F. From Norway. White, coarsely granular. G. From Norway. Brownish, finely granular. Ns B. Cc. Ds E. F. G. 48.80 | 49.62-| 51.11 | 49.52] 50.17 28.30 | 27.30 | 25.26) 28.80] 25.40 +29 31 -20 -40 .87 09 -07 .07 224 245 - 08 -55 alt -07 .23 AO |isceses< -12 -13 | undet. AO? Il essmasies -O1 -02 | undet. 4.49) 4:34] 4.98 | 3.87 4.03 74) 217) 1.43 13 12.21 8.03 | 10.51 8. 82 13. 40 2.44| 1.29] 3.73 .72 245 -08 1.73 | 1.52 94] 1.72 2.02 4.96 | 5.45] 6.57| 5.18 5.05 101.89 | 102.38 | 101.86 | 102.52 | 103.11 | 102.71 | 101.62 O-equivalent to Piss sesceyinse cesencicinesiecst: 2.44 2. 2.02 2. 29 2.76 2.18 2.13 99.45 | 99.74 | 99.84 | 100.23 | 100.35 | 100.53 | 99.49 Analyses H to L, of lepidolites from San Diego County, California, by W.T. Schaller. H. Red purple lepidolite, Pala. I. Blue purple, same locality as A. J. Purple lepidolite, Pala. K. White lepidolite, Pala. L. Lepidolite border on muscovite, Mesa Grande. M. Lithia mica, Cassiterite Creek, Cape York, Alaska. Analysis by Schaller. Intermediate between lepidolite and zinnwaldite. Tourmaline Queen mine. | 102. 43 | 99.74 288 ANALYSES OF ROCKS AND MINERALS, 1880-1908. COOKEITE. From Pala, San Diego County, California. Analysis by W. T. Schaller. G1 Oli uses Gece seca eembeeeeaen ss 4 vecmurce 35353: [gO Qt 108s 2 sae cisiss vexecicetinndae tomes sec 61 ANG Osho soi ct Secdooci eee eee eieeekees cesses 44.23 | HeO above 105°...............22 2. eee eee 13. 57 MnO cae pccesvensuuesoueeeanssse SaaS trace. |) Pisses ccdeces! Pawe wesexnaecucies eesoaeness 1.46 MgO: nacnccumecmied Gee ccencints die aece EES trace Ca O's sce seem ieee eciseeeseeteer Ghee Sse trace 100. 55 TAO So isch lelseaecreseamacn eee atom eee DET! ii LACS! zi ciero she sciosisiestis csgieis este Sora Ge Sie EeREeoe 61 Nag Ove aworwecatlesetiicce palcntrcinsrinise cs tes eee 2.11 Ke Ones: ta seeeeaeesaey st eee escnceuts seems 31 99.94 CRYOPHYLLITE. From Rockport, Massachusetts. Analyses by R. B. Riggs. Discussed by Clarke in Bull. 42. / A. Brilliant, broadly foliated, blackish-green variety. B. Paler, dull green, less lustrous, probably somewhat altered. C. Granular, resembling chlorite. BIOTITE, A. From Merrow Ledge, Auburn, Maine. Black. Analysis by F. W. Clarke and R. B. Riggs. B. Bronze mica, Laurel Creek corundum mine, Rabun County, Georgia. Analysis by E. A. Schneider. The loss is due to undetermined volatile matter. C. Brown mica from the granite of the Yosemite Valley, California. Analysis by William Valentine. Described by Turner, Am. Jour. Sci., 4th ser., vol. 7, p. 294. D. Mica from quartz monzonite, Tioga road, southeast of Mount Hoffman, Mariposa County, California. Sp. gr., 3.05 at 21°. Analysis by W. F. Hillebrand. Described by Turner, loc. cit. E. Black mica from quartz monzonite. About 1 kilometer south of Bloods station, Alpine County, California. Analysis by William Valentine. Described by Turner, loc. cit. F. Reddish-brown mica from pyroxenic gneiss. North Fork of Mokelumne River, above mouth of Bear River, Amador County, California. Analysis by William Val- entine. Described by Turner, loc. cit. G. Biotite from the granite of Butte, Montana. See Weed, Jour. Geology, vol. 7, p. 737. Analysis by H. N. Stokes. H. Biotite from orthoclase gabbro, between Blue and Mud Lakes, Livingston quadrangle, Montana. See W. H. Emmons, Jour. Geol., vol. 16, p. 193. Analysis by G. Steiger. MINERALS. 289 Ke H20 at 105°. . H20 above 105°. . PHLOGOPITE. A. From Edwards, St. Lawrence County, New York. Outwardly resembles talc. Analysis by E. A. Schneider. Discussed by Clarke and Schneider in Bull. 78. B. From Burgess, Canada. Brown. Analysis by E. A. Schneider. See Clarke and Schneider, Bull. 78. C. Phlogopite separated from the wyomingite of the Leucite Hills, Wyoming. Described by Cross in Am. Jour, Sci., 4th ser., vol. 4, p. 115. Analysis by W. F. Hillebrand. The following micas of doubtful character occur in serpentine. Analyses by Charles Catlett. See Bull. 64. D. Brown mica, from the serpentine of Montville, New Jersey. E. Yellowish mica, same locality as D. F. White mica, same locality. G. White mica from near Easton, Pennsylvania. E, F, and G are perhaps to be called vermiculites rather than micas. 290 ANALYSES OF ROCKS AND MINERALS, 1880-1908. LEPIDOMELANE. A. From Litchfield, Maine. Analyzed by I’. W. Clarke, and described in Bull. 42. B. Same as A. Later analysis by Clarke. See Bull. 55. C. Annite. From Rockport, Massachusetts. Analysis by R. B. Riggs. Discussion by Clarke in Bull. 42. D. From Port Henry, New York. Analysis by E. A. Schneider. See paper by Clarke and Schneider in Bull. 78. E. From Baltimore, Maryland. Analysis by F. W. Clarke, and discussed in Bull. 55. F. From near Pikes Peak, Colorado. Siderophyllite? The slightly altered margin of a large crystal. G. Much-altered central portion of specimen F. Analyses F and G by F. W. Clarke and R.B. Riggs. Described by Clarke in Bull. 55. Classed by Dana under biotite. | A B Cc D. E F G | Sl Ops ease sce seckes oeoeodde Sete io Lbialese | 82.09 | 32.35 | 32.03) 34.52 | 35.78 | 34.21 34. 63 PAO) Bi crore rast wags Sareea Soe Seles SOLE GR Sciwawets trace 3. 42 Qt Ses sect ioral Leesan ee a AlsO3....... 18. 52 17. 47 11.92 | 13.22 16.39 | 16.53 17.95 Fe203 19.49 | 24.22 8.00 7.80 | 14.55 | 20.15 31.25 FeO. 14.10 | 13.11 | 30.41 | 22.27] 11.02] 14.17 3.01 MnO 1. 42 1.02 21 +41 1.08 91 34 CaO sewse ccna etaa cee osewennee seneeaivieneed [seen none 23 | mnone| none 81 MEO oo ceceseenace sece~ewaceseceia veeixeeese 1,01 89 06 5. 82 8. 67 1.34 1.08 Ni OK COO! Scakaaeenbs Se acalacecaraee ss: doa ad Bears bearer bee Ban ge 1100's bereaes Noam gee cas 19O eras. scsesh ent SET ESS eRaeSeesk oekersrees| SeeSsoes| Yeceeees: trace OF Secerasiesecs cil sate cajereie,|aaizicielee Na2O......... 1.55 70 1.54 -16 1.43 89 a ee af 8,12 6. 40 8. 46 a 7.76 6. 50 1.96 20 at 105°... si 7 eee -} 4.62 \ 4.67 } a0) 8h } 4.48 } 4.54 i 7.82 PQ ee cs. ncaseceese dial Merepeearn'| ciara eel een wie are CEACO) toc. s nial tetas lnaeeteme 2 pismtaweaeeat ads ceeed laledaaes ieee eeoan ete none | none | trace .34 | none 08 54 100.92 | 100.83 | 100. 47 | 100.56 | 100.29 | 100.34 | 100.28 OrxeQUIV BICONE TO: Wisc ea datrosstsicite a visixeceieiete ac! cracipraiovetel ewes aediclal eae ste ahs A oes cere -0: a) eather. pertecetpeeeees 100. 42 |........| 100.31 | 100.06 ROSCOELITE. Analyses by W. I*. Hillebrand. A. From the Stockslager mine, near Lotus, Eldorado County, California. Described by Hillebrand in Bull. 167. B. Soluble portion of a vanadiferous sandstone from Placerville, Colorado. De- scribed by Hillebrand in Am. Jour. Sci., 4th ser., vol. 10, p. 130. A. B ies avis vavenaishn Chathloss eista Spa) auane cial Stela fs Rn weinle cis cle seis J.ecy a elsipeinnd «hte sou enentneing 45.17 46. 06 I Gl ais: sreraucencizcate esa: pai sleisisteenmeiai ais acta sete suiseldy ececieepgea eat meee Gee eh oe eR Sec) 4 aS lvacewens PIO 3s eieccatigwatextansmes rete «pee meres cueequmars eRe NeMedizaaey obese rede eae we eee aaeees 22. 55 Ve Opecseenauceckat sexe taensseeie st asenuesses tien guxes cosenseseaeeederemnthe; aisoreeermos 12.84 P@sO an ct daceeeeases aacagementan ok eee aetenac hate cme Oetint Maneteccunaae aa ceeacucieSaslisscaaeee 73 We Ora sstcjcetiniede Aes ctaemsecwsdect mo tinraunslesCisGlteulacintonge aateaniiem emia ws ieencames||, AOU las eciae CaO. . ~44 He 2 sm iSayaitealslattd da ekineuenuietsaae Monies Aen keted Satna tal cae S Qacetaeeeaneses Seeaon sel audellamercmard 1 2 gO.. es) TNsOs are Atavides BS oso zh ec rae ke elaine eietsercee tase Se eee eraeseekors eels Petty nein ceaice es ceca anieemicd LT ACO nak ane NQ1O: scccce ccna sea ceeces 22 KO nc .oncmanssume nsieinenctes ' 8.84 H20 at 100°. ...... x 1.98 H20 above 100° 4,07 MINERALS. MARGARITE. A. Brownish yellow, from Iredell County, North Carolina. Analysis by T. M. Chatard. See Bull. 9. 291 B. Bright green, associated with pink corundum. From Gainesville, Georgia. Specific gravity, 3.00. Analysis by T. M. Chatard. See Bull. 9. C. Inclusion in diorite, Crugers station, near Peekskill, New York. Analysis by T. M. Chatard. CHLORITOID. From a phyllite rock near Liberty, Maryland. Bull. 168, p. 50. See SO ss crue nate ees anmend Sete Se ey £ FAO: | Kea eins 2 cade Se.cailoanma henge dedentisasese AMO 9 socdaeaigiad eb geca> examen iotencisiet + Or SL, Ha O itd accra sca s cae hee mean see soeeeee Re Mei Osc nssstetecnseatee scceesecetieemeeceeees BNE | DIO 9. cds. osada sotasaatid ee adeseatocaeees FeO isc ceniseoeee sawee sess oaeaesesses sacks 21.04 | MnO \ec cccccccacsatacncatecceweesee sesemee os Mig Obi sevciessicitia.cssisis Secideaeminte rebates korcladeere QeABY | Pasi seco cmiance antec neutsse cawinceecesan as CAO cxctesencernies seers y Menai ee yeesigard trace N82 O se ertsnee ee sigs oureivaesesabeueens Ree scaek .20 XANTHOPHYLLITE. Variety waluewite, from the Nikolai-Maximilian mine, district of Slatoust, Urals, Siberia. Bull, 113. \ Analysis by E. A. Schneider. Discussion by Clarke and Schneider in THE VERMICULITES. A. Jefferisite from Westchester, Pennsylvania. Discussed by Clarke and Schneider in Bull. 78. B. Vermiculite, near jefferisite or culsageeite, from Corundum Hill, North Carolina. Analyzed by T. M. Chatard and described by him in Bull. 42. ©. Altered biotite from the zircon mine, Green River, Henderson County, North Discussed by Clarke and Schneider in Carolina. Analysis by E. A. Schneider. Bull. 90. Analysis by E. A. Schneider. D. Kerrite, from near Franklin, Macon County, North Carolina. Analysis by E. A. Schneider. Discussed by Clarke and Schneider in Bull. 78. 292 ANALYSES OF ROCKS AND MINERALS, 1880-1908. E. Lucasite. Described as a new species by Chatard in Bull. 42. Analysis by T. M. Chatard. From Corundum Hill, North Carolina. Sp. gr., 2.613 at 25.5°. H20 at 105°... HiO2abOved0o?s sccssncccaceqatiacucomssaes savancmcabeioaaeseste 21.14 100. 87 F. Hallite from Nottingham, Chester County, Pennsylvania. G. White lennilite from Lenni, Delware County, Pennsylvania. H. Brown lennilite, same locality. I. Green lennilite, same locality. Analyses F to I by E. A. Schneider. Discussion by Clarke and Schneider in Bull. 90. F G. H I IO aise caja usssnicisinsoaes des acre aaiiSeaas gus eG Seem eee aia saioa eee aaa 34. 90 I Og eicicce cre eeessrcssit -10 AlO3 10. 60 Fe203 8.57 Cr203 +23 FeO. 22 MnO -17 NIQ 2 ecnciciorarisecinccacatinaurcasaes 19 MBO) os cseieeeresse.stassiess qiessigin fisrataystareretenseite 28. 21 BQO :i0s coleman ox neednnebeeeaeeniaks iste swan lawns ss aeeres selves etelterecac|| CEACE: preracec H20 at 105°....... NS . 5 4,99 H20 above 105° 11. 48 99. 66 J. A vermiculite from Newlin, Chester County, Pennsylvania. K. Painterite from Middletown, Delaware County, Pennsylvania. L. Another sample of painterite. Analyses J, K, L, by E. A. Schneider. Discussion by Clarke and Schneider in Bull. 90. M. Hydromica from Rocky Hill, New Jersey. Analysis by George Steiger. De- scribed by Clarke and Darton in Bull. 167. N. Analysis M corrected by deduction of calcite, union of like radicles, and recal- culation to 100 per cent. QO. Protovermiculite from Magnet Cove, Arkansas. Analysis by E. A. Schneider. Discussed by Clarke and Schneider in Bull. 90. MINERALS. 293 P. Chloritic vermiculite from Corundum Hill, North Carolina. Q. Altered chlorite from Corundum Hill. Analyses P, Q by T. M. Chatard. De- scription in Bull. 42. CLINOCHLORE. A. From Westchester, Pennsylvania. Broadly foliated. Analysis by E. A. Schnei- der. Discussed by Clarke and Schneider in Bull. 78. B. From the Nikolai-Maximilian niine, district of Slatoust, Urals, Siberia. Analy- sis by E. A. Schneider. Discussed by Clarke and Schneider in Bull. 113. C. Leuchtenbergite from Slatoust. Analyst and reference as under B. D. Kotschubeite from Green Valley, American River canyon, California. Sp. gr., 2.69. Analysis by W. H. Melville. Described by Melville and Lindgren in Bull. 61. Mg Ee FIO BELO a occas comame ncceeeas YeROaNe tos Poe ean EnEReE MEW exeRe i ‘ . J 20 above 105° ; 13.33 | 13.20 12. 68 15619—Bull. 419—10——20 294 ANALYSES OF ROCKS AND MINERALS, 1880-1908. PROCHLORITE. From the Aqueduct tunnel, Washington, District of Columbia. Analysis by E. A. Schneider. Described by Clarke and Schneider in Bull. 78. SIO ecoee cokes. ae ukeheeesad aod Cates, 25:40" (20 at 05". 2c: sn emeeaennenes we aeeeerestiies 22.80 | HeO above 105°..-.............. 2:86: | Fecverienses seared ty guises vosceeeeiiices 17.77 25 19.09 SERPENTINE.¢ A. From Newburyport, Massachusetts. Analysis by IF. W. Clarke. B. Same locality as A. Analysis by E. A. Schneider. Discussion by Clarke and Schneider in Bull. 78. ©. From Moriah, New York. Analysis by Charles Catlett. Described by Merrill, Proc. U. 8. Nat. Mus., vol. 12, p. 596. D. From the aqueduct shaft, New York City. Analysis by Charles Catlett. See Merrill, loc. cit., p. 598. E. From Montville, New Jersey, light yellowish green. F. From Montville, darker green. Analyses E, IF! by Charles Catlett. See Mer- rill, Proc. U. S. Nat. Mus., vol. 11, p. 105. G. From Montville, massive. H. From Montville, chrysotile. Analyses G, H by E. A. Schneider. Discussion by Clarke and Schneider in Bull. 78. Mg! 3 Tij0: ab 105°... 02.0 scsseseesliniee. 1.20 1.36 ‘96 | 2.04 a0 above 1054 . 13.86 \ 13:65 13.26 Hi 14.12 \ 14.24) 13°79] 13,60 (Per ee CRE ee eee ee ae ee eee et | ee eee a eee ne eee PIRI || actin ays alates Peseta aeAe Mae nee Sta a 100.05 | 99.77 | 100.18 | 99.85 100.13 | 99.73 | 100.55 I. From Easton, Pennsylvania. Resembles a vermiculite. Analysis by E, A. Schneider. See Clarke and Schneider, Bull. 90. J. Grayish-green serpentine from Corundum Hill, North Carolina. K. Picrolite from Buck Creek, Clay County, North Carolina. Analyses R and 8 by E. A. Schneider. See Clarke and Schneider, Bull. 78. L. From the river Poldnewaja, district of Syssert, Urals, Siberia. Analysis by E. A. Schneider. See Clarke and Schneider, Bull. 113. M. From Greenville, Plumas County, California. Analysis by W. H. Melville. Described by Diller in Bull. 150. a Other analyses of serpentine are given in the section on igneous and crystalline rocks. See pp. 18, 19, 146, 161, 162, 169, 172. i : MINERALS. 295 05°. H20 above 105°. . GH YOMU LG 5 e222 aici crasisiinincrctners : \ 100.38 | 99.94 | 100.22} 99.77] 100.18 | GENTHITE. From Riddles, Douglas County, Oregon. Analyzed by I’. W. Clarke, and described by Diller and Clarke in Bull. 60. SiO gs neesnscneee sa Seetioeuins a ees Se Seed = Selb ante eee ea ee eee SEE eee. 44.73 lp O Sercrsiasensig-a 04: achomislais, st abetecovecn etapa bens. cva.etslaominn acvenneinies Sawaal We thine ee caveats Pe ee ee \ 1.18 MgO...... . 10.56 INI! 3.2. nice usage ve cians we gains Sa eeee baeeEs ile eR eA Gemeee eee eee tess 27.57 GOVE WOM ate wash etemygaek Gacanen tees here, gametes dace emcee neseae 8.87 Ho OsaON GeO? iy cree erie Coresia comes toe esasibiais oases oR ete b aesitinte Btieeald aie nena eared 6.99 99. 90 TALC. A. Apple green, beautifully foliated. From Huntersville, Fairfax County, Vir- ginia. Analysis by E. A. Schneider. B. From Deep River, North Carolina. Analysis by H. U. McNeil. A. B. S10 geciais. scion dais saioeion wie oa wauinniards saw eee xa eMeRainaind HOMES ONES PeSecetad Seeeeeeteaine 62. 63 ANG $i cc raed. secteuzverscs Se dvenetatettensaes a. arrvareurlste. 20 ~55 HQO8 sc cmcaswaxeee wer erceaene 2 1.07 Be Q oie sccrciepermpiwssatereedems ts Seta eee ia EES $ER Seed tiene cinicleeencneotinence|) OO] secmeaee ME OM secre cee cesta sees 31.36 ce Zest sega tnyspe Gta eantse eset ne ea «| TaCe:|,s25262 H20 at 105°. .......- = 6 VE | esenozce H20, ignition 4.84 100, 45 MEERSCHAUM. Three magnesian silicates of uncertain character. A. From Arroyo de San Jose de Gracia, Lower California. Received from W. F. Ferrier. Analysis by W. T. Schaller. B. From Alunogen district, Grant County, New Mexico. Received from A. R. Ledoux. Analysis by Schaller. C. From the Dorsey mine, 12 miles northwest of Silver City, New Mexico. Analysis by G. Steiger. A is near saponite. C may be sepiolite. , 296 ANALYSES OF ROCKS AND MINERALS, 1880-1908. @ Loss on ignition. GLAUCONITE. From Big Goose Canyon, 15 miles southwest of Sheridan, Bighorn Mountains, Wyoming. Analysis by George Steiger. Sp. gr., 2.73. : Na,0... H20 at 100°. . ae ee be Ms HO above 100° Le Sirens dee oee em duis Geer-eeen 4. 88 99. 06 KAOLINITE. . From Hockessen, Delaware. Analysis by George Steiger. . From Aiken, South Carolina. Analysis by F. W. Clarke. From Aiken. Analysis by Steiger. . From Talladega, Alabama. Analysis by Charles Catlett. . From the Eureka vein, St. Peters Dome, near Pikes Peak, Colorado. Analysis by W. F. Hillebrand. Described by Cross and Hillebrand in Bull. 20. F. From New Discovery mine, Leadville, Colorado. Analysis by W. F. Hillebrand. G. From National Belle mine, Ouray County, Colorado. Analysis by W. I. Hille- brand. Sp. gr., 2.611 at 18.5°. Described in Bull. 20. HUOme 43.21 | 46.06 37.27 | 39.63 HALLOYSITE. A. From Horse Cave, Kentucky. Analysis by H. C. McNeil. B. From Edwards County, Texas. Analysis by McNeil. C. From the Logan mine, Rico, Colorado. Analysis by W. F. Hillebrand. MINERALS. 297 D. From the Lucia mining district, Elko County, Nevada. Pale greenish. Anal- ysis by G. Steiger. KE. From the Detroit copper mine, near Mono Lake, California. Analyzed by F. W. Clarke, and described in Bull. 9. . F, From Pala, San Diego County, California. Pink. Analysis by W. T. Schaller. 14.34 100. 18 | 100.63 | 99.99 | 100.18 CIMOLITE. Rose-red, earthy variety, from Norway, Maine. Analysis by R. B. Riggs. De- scribed by Clarke in Bull. 42. PYROPHYLLITE. A. Compact, white. From Deep River, North Carolina. Analysis by George Steiger. B. Radiated. From East Tres Cerritos, California. Analysis by H. C. McNeil. | Mg = TEA Oar MOSS cis cescteenshavesx-sictceercisusts ais eee Sis oats Gee ee wherein ins erejeteiivs Gon Secu icus EERE ROIS! pollens) pie 14 FO ignition ic earsce:s,accrocemcian via aie ewes ate ot Sela ayer Slereiewse essed edi aiesin nein aeeseee --| 5.35 5.27 TiO 5 BEMENTITE. From the Trotter mine, Franklin Furnace, New Jersey, collected by C. Palache. Analysis by G. Steiger. H20 at 100° ae HO above 100°..........22 22. cee eee eee 8.01 298 ANALYSES OF ROCKS AND MINERALS, 1880-1908. MORENCITE. Described as a new mineral from the Arizona Central mine, Morenci, Arizona, by Lindgren and Hillebrand, in Bull. 262, p. 49. Analysis by W. F. Hillebrand. HeO cat: 150? va cca sate re aaamcicainy ed takai .12 H:0 below redness HO at red heat........... BOLE. From South Table Mountain, Golden, Colorado. Described by Cross and Hille- brand in Bull. 20. Analyses by W. F. Hillebrand. A. Dark brown. B. Light brown. a By difference. VIII. TITANATES AND TITANO-SILICATES. ILMENITE. From the peridotite dike of Elliott County, Kentucky. Described by Diller in Bull. 38. Analysis by T. M. Chatard. ARIZONITE. New species from 25 miles southeast of Hackberry, Arizona. Analyzed by Chase Palmer, and described by him in Am. Jour. Sci., October, 1909. The following analysis shows the mineral to be a ferric metatitanate. MINERALS. _ 299 XANTHITANE. _From Green River, Henderson County, North Carolina. Alteration product of titanite. Analyzed by L. G. Eakins, and described in Bull. 60. Sp. gr., 2.941 at 24°. Material dried at 100°. TITANITE. Pale-yellow, semitranslucent. From the waterworks tunnel, Washington, D. C. Occurs embedded in prochlorite. Analysis by F. W. Clarke. Sp. er., 3.452. TSCHEFFKINITE. From Bedford County, Virginia. Analyzed by L. G. Eakins and described by him in Bull. 90. A. Lustrous portion. Sp. gr., 4.33 at 27°. B. Dull portion. Sp. gr., 4.38 at 22°.2. ASTROPHYLLITE. From St. Peters Dome, near Pikes Peak, Colorado. Analyzed by L. G. Eakins and described by him in Bull. 90. 3800 ANALYSES OF ROCKS AND MINERALS, 1880-1908. IX. COLUMBO-TANTALATES. SAMARSKITE. Mineral near samarskite, from Devils Head Mountain, near Pikes Peak, Colorado. Analyzed by W. F. Hillebrand and described in Bulletin 55. A. Pitch-black variety, streak dirty brown. Sp. gr., 6.18 at 22° B. Black, streak salmon colored. Sp. gr., 6.12 at 25° C. Altered variety. Sp. gr., 5.45 at 16°. 100.31 | 99.75 | 100.18 @ With TiOs. b Or 0.74 UOs, X. BORATES. COLEMANITE. A. Transparent crystal, ordinary type, Death Valley, California. B, C. Bladelike crystals, Death Valley. D. Priceite, Curry County, Oregon. E. Pandermite, Island of Panderma, Black Sea. Analyses by J. E. Whitfield, with details in Bull. 55. 49.56 | 49.62 | 48.44 48. 63 27.36 | 27.40 | 32.15 32. 16 -25 20) | sesotenelscensames 22.66 | 22.70] 19.42 19. 40 44 PAT Micon cee) aciseraces 99.98 | 100.27 | 100.45 | 100.01 | 100.19 MINERALS. 3801 ULEXITE. From Rhodes Marsh, Esmeralda County, Nevada. Analysis by J. E. Whitfield, with description in Bull. 55. 43120. l) SOgsee seeecins Hoatoeeeees see ecaveims ee eeReS 28 14,52) iCl neacd tence cemdeateua acne eae ee eawer 2. 38 10, : 100. 52 29. 46 O equivalent to Cl.........-..-.2..--22--0-- - 53 04 99. 99 LUDWIGITE. A. From Morawitza, Banat, Hungary. Analysis by J. E. Whitfield, with descrip- tion in Bull. 55. | B. Same locality as A. Analysis by W. T. Schaller. C. From Phillipsburg, Montana. Contents some admixed olivine. Analysis by Schaller. A B. Cc. Sie. - 36 8. 85 B203. 217.02 18. 48 ANGO§ . seiqsciecricrens sied xGrsicpatensta cirseteieienssaisiate 2 sj sverermnsisictsie adm miaer de Aaaaietlainatens eaeotenmad hw ener lememeece 1.81 POO juss senses s 1G. ciiustetow any anskenimiod nakeuaen, Poe ee Sens seas 35. 67 29. 73 FOO scssencainrein syeqaias cseeceuewuy rencinea ees tegwumEaeeT Tekh 15. 84 5.79 MnO} sessecneis yexeaencmers ee eeeihe mremoemids Aone eE eames ainae a! AION acc caged aoecinnes BO episcietieis p weet tees a ec ee ea tia ease Se eyaaeityesciata acc. 28. 88 39. 04 a0 at 105°....-...-......- ioe Taal aaa Ribena SepitaceresNe Soa ees - 51 - 90 H,0 above 105°......--.-.. Gasiiadoeiyeuanei s Bedotem as shoes iba i 4 82 97 Oaiarsecacncernedswtnceened scenddWeens sos meeaa sea tdad anal 7d ewan t Kanemasien x fewaln omer - 90 36 100.10 | 100.00 | 100.93 a By difference. WARWICKITE. From Edenville, Orange County, New York. Somewhat contaminated by spinel, from which the warwickite could not be entirely freed. Analysis by J. E. Whitfield. See Bull. 64. i tchgiipuipioiig supe Sayan wile ecitew dala aevercvclate: 18296) ff (CROs: secictscasewies acc etal ct nese encores 38 SsaS Weekes {eeviorsskeweeees Serene 18068)) MgO's 212s: eiaducas mnccccksexbeveeivaseseees, B44 ASaek eee 1,16 | HeOes sanseaccenaetensenczeaet teseeeesssaee 2:80 SPadaeaiae 9.44 sipie en Seles des@iaeiceser aaa me eemooeEaeaeesie 14. 23 100. 06 XI. NITRATES. SODA NITER. From the Leucite Hills, Wyoming. Analysis by L. G Eakins. The N,O, was not determined directly, but calculated to satisfy Na,O-+K,0. 302 ANALYSES OF ROCKS AND MINERALS, 1880-1908. : NITER. A. From Utah, exact locality unknown. Analysis by T. M. Chatard. B. From the Leucite Hills, Wyoming. Analysis by L. G. Eakins, with the N,O, calculated to satisfy the alkalies. XII. PHOSPHATES. XENOTIME. From the gold washings at Brindletown, North Carolina. Analyses by L. G. Eakins. A. Green; sp. gr., 4.68 at 24.2° B. Brown; sp. gr., 4.46 at 24.4°. @ Molecular weight, 260. APATITE. Dark-green, massive apatite from the topaz locality at Stoneham, Maine. Analysis by J. E. Whitfield. See Bull. 27. Sp. gr., 3.27. MINERALS. 303 TRIPLITE. From a tin mine near Rapid City, South Dakota. Probably identical with Head- den’s “‘griphite.”” Analysis by L. G. Eakins, with description in Bull. 60. hehe | sO) cp ccc tee Ses peace a trace 43 3.67 8.74 -26 2.36 2.35 1.97 -25 29.13 6.72 100. 94 trace: |. Exess: Oc cccnc sneecssees conceumeeeear lags 1.05 13 5.25 99. 89 AMBLYGONITE. From Pala, San Diego County, California. Analysis by W. T. Schaller. 5.95 2,29 101.31 +96 100. 45 DUFRENITE (?). Two samples ofa fibrous phosphate from Grafton, New Hampshire. Near dufrenite, but uncertain. Analyses by W. T. Schaller. PURPURITE. Described as a new species by Graton and Schaller. Analyses by W. T. Schaller. A. From Faries mine, Kings Mountain, North Carolina. B. From Hill City, South Dakota. A. B 47.30 43. 45 29. 25 12. 08 15. 89 38. 36 1.48 1.37 aieRecincas trace present trace 84 trace 5. 26 4. 82 - 62 -19 100.54 | 100.27 304 ANALYSES OF ROCKS AND MINERALS, 1880-1908, EVANSITE- A. From near Goldburg, Idaho. B. From Columbiana, Alabama. Analyses by W. T. Schaller. aBy difference. Determination lost. TURQUOISE. From Los Cerrillos, New Mexico. Described by Clarke and Diller in Bull. 42. Analyses by F. W. Clarke. A. Bright blue, faintly translucent in thin splinters. B. Pale blue, with a slight greenish cast. Opaque and earthy in texture. Sp. gr., 2.805. C. Dark green, opaque. 98.87 | 99.79 99. 83 XIII. VANADATES. DESCLOIZITE. A. From the Mayflower mine, Bald Mountain mining district, Beaverhead County, Montana. Yellow, friable, not crystallized. B, From the Commercial mine, Georgetown, New Mexico. Brilliantly crystallized. C. Cuprodescloizite from the Lucky Cuss mine, Tombstone, Arizona. Sp. gr., 5.88 at 19° Analyses by W. I. Hillebrand, with description in Bull. 64. MINERALS. CARNOTITE. 30 From Montrose County, Colorado. See memoir by Hillebrand and Ransome, An Jour. Sci., 4th ser., vol. 10, p. 120. A, B, C. From Copper Prince claim, Roc Creek. D, E. From Yellow Boy claim, La Sal Creek. Analyses by W. F. Hillebrand. \ B. & D. E. ees rece eons as wen ini eo gdb tn ence nial atic iar detvarae 18.35 | 18.49] 15.76 | 17.80 18. AS §O be ctireerin dana cinicin Because -25 | trace | none | none no: sf 0) nes 33 - 80 -40 | trace ‘ SiO. metre atot aol sp ala asim ay 51S et aVScmi ata Sy Rain RISinNE ai (Sree BIRR ae BE RT | re octeea ies +15 -13 5.05 2 WO Sure saregorucernae mesures -10 - 03 CE Mass sseroisiers (?) COD scxsewsegacicncescaiwe -33 -56 | none |.......- no: SOs.5 <0 tewaecenesineeeeis wD | eve ceces esse o LS) ema semen no: UO 8 vice -cieniepseeecemeeueesee 52.25 | 54.89 | 47.42 | 52.28 54. IMG OF sce ncnnpaicini inte ernie 23 18 -18 | undet. s CEO gio ocaeciccinrcrdsiciciaeews EROS. | jict teen fosc| essen Meedeicicinsal nie Gaels Pei Ost acaecieueet osseous, 1.77 21 .72 3. 36 AMO ca ercsininscecatsmenncenees 1.08 - 09 -08 | undet. PbO vsacsiinseeseremmcaee 25 13 - 18 | undet. 7 CU Dia ercirenscsasiavaieateRinanrs -20 +15 22 starsiata paras tra CaO waccecmcinsseeeacecewst 2.85 3.34 2.57 1.85 1. GrO) sierra ecenaicemene es pecierns hana taiehs seer mnciaicnectrerercteate niarenenayal| Biomete Serees - 02 CPs Nctarapcteass tra BaO...ccncacacacieabeeens -72 -90 -65 3.21 25 MEOK cc ansmaussccsenkence 20 22 24 elt : ING Ogg ce Sea eee peatnagcaass ithe none | trace (?) trace tra IN BIO see sereeedaeersiadnea eine 09 -14 07 07 A Ke occas cainsiesacaknmaesene 6.73 6. 52 6. 57 5. 32 5. gO ab 108? eon asjacecreccrnicncssccs 2. 59 2. 43 1.85 4.52 3. H20 above 105° 3.06 2.11 2.79 3. 87 2, TMSO]W DIG accent ceteaprecyocankere wvssasateramatsie'nircemminstes imieniataomreiettinls sie 8. 34 GUO.) I900 Ni cccese 10. 99.84 | 98.46 |} 99.01 | 97.50 99. XIV. ARSENATES AND ANTIMONATES., OLIVENITE,. From the American Eagle mine, Tintic mining district, Utah. Described b Hillebrand in Bull. 20. Analysis by W. F. Hillebrand. ERINITE. From the Mammoth mine, Tintic district, Utah. Described by Hillebrand an Washington in Bull. 55. Analyses by W. F. Hillebrand. 306 ANALYSES OF ROCKS AND MINERALS, 1880-1908. CLINOCLASITE. From the Mammoth mine, Tintic district, Utah. Described by Hillebrand and Washington in Bull. 55. Analyses by W. F. Hillebrand. Sp. gr., 4.38 at 19°. aAssumed the same as in .A. CONICHALCITE. From the American Eagle mine, Tintic district, Utah. brand, with description in Bull. 20. TYROLITE. From the Mammoth mine, Tintic district, Utah. Described by Hillebrand and Washington in Bull. 55. Analyses by W. F. Hillebrand. Sp. gr., 3.27 at 20° .5. CHENEVIXITE. From the American Eagle mine, Tintic district, Utah. Analyzed by W. F. Hille- brand and described in Bull. 20. MIXITE. From the Mammoth mine, Tintic district, Utah. Described by Hillebrand and Washington in Bull. 55. Analysis by W. F. Hillebrand. MINERALS. 307 SCORODITE. An incrustation on hot-spring deposits, from Joseph's Coat Spring, Broad Creek, Yellowstone Park. Analyzed by J. E. Whitfield and described in Bull. 55. BINDHEIMITE. From a claim near the Bertrand mine, Secret Canyon, Nevada. Analyzed by W. F Hillebrand and described in Bull. 20. Sp. gr., 5.01 at 19°, after correction for admixed quartz and cerussite. XV. SULPHATES AND TELLURITES. ANHYDRITE. From Newhouse, Utah. Approximate analysis by W. T. Schaller. GYPSUM. A. From Hillsboro, New Brunswick. Analysis by George Steiger. B. From the Western Plaster Works, Alabaster, Michigan. Analysis by George Steiger. C. From east of Cascade, Black Hills, South Dakota. Analysis by Steiger. D. From Rico-Aspen mine, Rico district, Colorado. Analysis by W. F. Hillebrand. E, F. From Nephi, Utah. Analyses by E. T. Allen. Some anhydrite must be present. PTESENE! | -ccain einsase| siccciersig. cis 100. 42 | 99.96 99. 54 308 ANALYSES OF ROCKS AND MINERALS, 1880-1908. G. Gypsite, Watonga, Oklahoma. Analysis by Chase Palmer. H. From west point of Sierra Nacimiento, New Mexico. Analysis by W. T. Schaller, I, J. From Lost Hills, San Joaquin Valley, California. Analyses by R. C. Wells. 99. 66 | 99.92 | 99.2 | 100.4 BOOTHITE. From Campo Seco, California. Analysis by W. T. Schaller. S Oieccas ence nd oedanceasadewedihe dteanacereddemend ve eaee awe setidaaeneneeeewtea 27.25 cud 26.13 FeO -81 MgO ....-. sisters 64 H20 at 105° .......-. 36. 76 H20 above 105°... .. 4.91 Tnsoluble's)...:.s0sesecesescke ce eeetesa eee ceed eioskces eeeeeerese