A Manual of Determinative Mineralogy; With Tables for the Determination of Minerals by Means of : I. Their Physical Characters. II. Blowpipe and Chemical Properties
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 edition. Excerpt: ...pale yellow. Luster greasy, resinous. Translucent to opaque. (See p. 214.) In oxidized parts of lead ores; ingold and silver veins; with pyromorphite, wulfenite, galena. Struct.-Thin square tabular tetragonal crystals; sometimes acute pyramidal; granular. Cleavage indistinct; brittle; fracture conchoidal, uneven Color yellow, orange, olive-green, brown, yellowish gray, whitish. Streak whitej Luster adamantine, resinous. Transparent to translucent. (See p. 214.) In oxidized parts of lead veins with galena, pyromorphite, vanadinite. 3 G. 1.8-1.9 ALLOPHANE, approx. A12SiO5.5H2O; variable. Struct.-Amorphous, inorusting, stalactitic; fracture conchoidal, earthy; brittle. Color sky-blue, green, yellow, brown, colorless. Streak white. Luster vitreous, waxy. Translucent. Resembles opal. (See p. 252.) In fissures and cavities in copper and iron mines; cavities in marls and limestones. Struct.-Pseudohexagonal orthorhombic crystals, clusters, star-shaped groups; granular, fibrous, compact. Cleavage indistinct, brittle; fracture conchoidal. '. Color white, gray, colorless; or yellow, brown, etc., from impurities. Streak white. Luster adamantine, greasy, silky. Transparent to translucent. (See p. 214.) ' In oxidized parts of lead ores with lead, zinc, iron, and copper minerals. 3 G. 2.5-2.6 SERPENTINE, H4Mg3Si2O9; commonly Fe, sometimes Ni. 4 Struct.-Massive compact, fibrous (chrysotile, asbestos); lamellar (marmohte); columnar (p1lcrolite); brittle; fibers flexible and tough; fracture conchoidal, splintery. Color olive-green, blackish green, yellowish green, yellow; rarely white. Streak white. Luster greasy, waxy, silky. Translucent to opaque. (See pp. 232, 254.) Common alteration product of olivine rocks (peridotites); in dolomitic...
- 189 x 246 x 4mm | 168g
- 13 Sep 2013
- United States
- black & white illustrations