- المجال: Mining
- Number of terms: 33118
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- Company Profile:
The U.S. Bureau of Mines (USBM) was the primary United States Government agency conducting scientific research and disseminating information on the extraction, processing, use, and conservation of mineral resources.
Founded on May 16, 1910, through the Organic Act (Public Law 179), USBM's missions ...
A monoclinic mineral, 2(Ni<sub>3</sub>(AsO<sub>4</sub>)<sub>2</sub>.8H<sub>2</sub>O) ; vivianite group with cobalt replacing nickel toward erythrite; occurs as light-green soft coatings of fine striated crystals, or 134 earthy; an oxidation product of nickel and cobalt arsenides, the green crusts being a distinctive guide to nickel ores. Formerly called nickel ocher. Compare: nickel bloom
Industry:Mining
A monoclinic mineral, 2(Pb<sub>4</sub>FeSb<sub>6</sub>S<sub>14</sub>) ; metallic gray to black; in acicular crystals or capillary forms of featherlike appearance, thus the term "feather ore;" in low- to medium-temperature veins with other lead sulfosalts, galena, and carbonates.
Industry:Mining
A monoclinic mineral, 2(Pb<sub>4</sub>FeSb<sub>6</sub>S<sub>14</sub>) ; metallic gray to black; in acicular crystals or capillary forms of featherlike appearance, thus the term "feather ore;" in low- to medium-temperature veins with other lead sulfosalts, galena, and carbonates.
Industry:Mining
A monoclinic mineral, 2(Pb<sub>4</sub>FeSb<sub>6</sub>S<sub>14</sub>) ; metallic gray to black; in acicular crystals or capillary forms of featherlike appearance, thus the term "feather ore;" in low- to medium-temperature veins with other lead sulfosalts, galena, and carbonates.
Industry:Mining
A monoclinic mineral, 2(PbCu(SO<sub>4</sub>)(OH)<sub>2</sub>) ; azure blue; in oxidized zones of lead, copper, and silver deposits.
Industry:Mining
A monoclinic mineral, 2(Zn<sub>5</sub>(CO<sub>3</sub>)<sub>2</sub>(OH)<sub>6</sub>) ; forms massive, fibrous, earthy, or compact encrustations with blue luminescence; a secondary mineral in weathered zones of zinc deposits commonly associated with smithsonite or sphalerite; a source of zinc.
Industry:Mining
A monoclinic mineral, 2(Zn<sub>5</sub>(CO<sub>3</sub>)<sub>2</sub>(OH)<sub>6</sub>) ; forms massive, fibrous, earthy, or compact encrustations with blue luminescence; a secondary mineral in weathered zones of zinc deposits commonly associated with smithsonite or sphalerite; a source of zinc.
Industry:Mining
A monoclinic mineral, 4(Ag<sub>2</sub>S) ; dimorphous with argentite, pseudohexagonal, in slender prisms; sp gr, 7.2 to 7.3; a source of silver.
Industry:Mining
A monoclinic mineral, 4(Ag<sub>2</sub>Te) , with gold replacing silver toward petzite; soft; metallic gray; fine grained, massive, or compact; sp gr, 8.24 to 8.45; in hydrothermal veins associated with quartz, pyrite, and native gold; a source of silver in California, Colorado, Ontario, Mexico, Chile, Romania, and Zimbabwe.
Industry:Mining
A monoclinic mineral, 4(BeAlSiO<sub>4</sub>(OH)) ; vitreous; Mohs hardness, 7-1/2; in auriferous sands in Austria, Russia, Brazil, Peru, and Tasmania Australia; and used as a minor gemstone.
Industry:Mining
