This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 edition. Excerpt: ... favour. CHONDRONITE, a mineral that is found abundantly at the Tilly Foster mine in Brewster, Putnam County, New York, appears in ...Read MoreThis historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 edition. Excerpt: ... favour. CHONDRONITE, a mineral that is found abundantly at the Tilly Foster mine in Brewster, Putnam County, New York, appears in deep garnet-red crystals of great beauty. Chondron-ite is classed with the minor gems, and it deserves a more extensive use. Hardness, 6.5. It has a vitreous lustre. DIOPSIDE is a variety of pyroxene; hardness, 5 to 6; lustre, vitreous or greasy; transparent to translucent; and doubly refractive. Fine specimens, fit for gem purposes, are found near DeKalb, St. Lawrence County, New York. When cut brilliant, diopside makes a very attractive stone and resembles green tourmaline. DIOPTASE is a silicate of copper; other names for it are achirite and Congo emerald; hardness, 5. The softness and brittleness of this attractive stone disqualify it for extensive use. FLUORITE or fluorspar, of which chloro-phane or cobra stone is a variety, is a highly lustrous, brittle crystal of wide colour range; hardness, 4. Varieties of fluorspar are sometimes termed, in the trade, " false" ruby, emerald, sapphire, and other well-known gem stones. GOLD-QUARTZ--in crystals, filiform, reticulated, and arborescent shapes--is commonly worn as a jewel. Gold penetrating white, black, rose, and amethystine quartz, is worked into jewelry of all sorts, sometimes of very elaborate designs. These uses of gold-quartz are most common on the Pacific coast and in western North American cities. HEMATITE, composed of iron 70, oxygen 30, is commonly cut into beads, charms, and intaglios. Chromic iron and ilmenite are similarly used. Although this iron ore is steel-grey, 9 o H V. I! r"-NiVM!r:: -; . A V-when polished, its streak, when scratched, is red; hence the name hematite, meaning "bloodstone." IOLITE, also called dichroite and water sapphire, is...Read Less
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