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Excerpt from Minerals of Colorado Gold. Crystallizes in the Isometric system; the octahedron and dodecahedron are the most common forms; sometimes in cubes and trapezohedrons; the crystals are usually small and imperfect, and sometimes elongated; also reticulated, arborescent and spongiform shapes, in scales and rolled masses. Color various shades of gold-yellow, sometimes inclining to silver-white. Very ductile and malleable. Hardness 2.5 to 3. Specific gravity 19.34 when quite pure. Occurs in greater or less quantities throughout the mountainous portions, of the State in the gravel of streams and in veins. The veins of Gilpin County are especially noteworthy for the amount of gold mined annually. Small but unique crystals have been found in a number of the mines. Large masses of wire and leaf gold were taken from the Printer Boy mine, in Lake County, in 1870. In combination with tellurium in many of the mines in Boulder County. Silver. Isometric; occurs crystallized in cubes, octahedrons, trapezohedrons and other forms, but generally distorted; usually filiform, arborescent, in plates or coatings and sometimes massive. Color silver-white, but subject to tarnish. Ductile. Hardness 2.5 - 3. Gravity 10.5 when pure. Found native in small quantities in nearly all silver mines in the State. In scales, arborescent and filiform, the threads sometimes knotting a mass two inches in diameter, in the mines of Georgetown. Occasionally found in nuggets from the size of a pea to those weighing a pound. The Boulder Nest mine in Clear Creek County, and the Caribou mine in Boulder County were especially productive of native silver in their surface workings. Frequently found in the Blue River placers. Crystals are very seldom met with. Mercury. Quicksilver. Isometric; Occurs in small fluid globules. Color tin-white. Lustre metallic. Has been found sparingly in the tellurium-bearing mines of Boulder County. About the Publisher Forgotten Books publ.

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Erscheinungsdatum: 16.04.2017, Medium: Taschenbuch, Einband: Kartoniert / Broschiert, Titel: Minerals of Colorado, Autor: Randall, J. S., Verlag: Hansebooks, Sprache: Englisch, Rubrik: Naturwissenschaften // Technik allg., Seiten: 92, Informationen: Paperback, Gewicht: 141 gr, Verkäufer: averdo.

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Minerals of Colorado: J. S. Randall Minerals of Colorado: J. S. Randall.

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Minerals of Colorado ab 13.9 EURO.

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Minerals-of-Colorado~~J-S-Randall, Minerals of Colorado, Paperback.

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