id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
23626	Mastin, John	The Chemistry, Properties and Tests of Precious Stones			.txt	text/plain	27531	1275	67	grouping form a certain means of testing stones and of distinguishing In stones possessing certain crystalline structure, the cleavage planes stones, for when viewed at one angle they appear of a definite colour, The colours of a gem are tested by the stone being put in the stone as a piece of cut and coloured quartz, thus confirming what he occurs, the colour, form, and the self-evident character of the stone certain stones allow light to pass through their substance, whilst heat vary in different stones of the same kind or variety, as already heat test as applied to precious stones. forms a simple and ready means of testing the electricity in a stone. A knowledge of the colours natural to precious stones and to jewels even though some stones are found in a variety of colours. no other stone, though it is possible, by heating alumina coloured with	./cache/23626.txt	./txt/23626.txt