- المجال: Mining
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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, 96(Cu<sub>2</sub>S) ; pseudohexagonal, metallic gray-black with blue to green tarnish; sp gr, 5.5 to 5.8; a secondary vein mineral; an important source of copper.
Industry:Mining
A monoclinic mineral, 96(Cu<sub>2</sub>S) ; pseudohexagonal, metallic gray-black with blue to green tarnish; sp gr, 5.5 to 5.8; a secondary vein mineral; an important source of copper.
Industry:Mining
A monoclinic mineral, 96(Cu<sub>2</sub>S) ; pseudohexagonal, metallic gray-black with blue to green tarnish; sp gr, 5.5 to 5.8; a secondary vein mineral; an important source of copper.
Industry:Mining
A monoclinic mineral, 96(Cu<sub>2</sub>S) ; pseudohexagonal, metallic gray-black with blue to green tarnish; sp gr, 5.5 to 5.8; a secondary vein mineral; an important source of copper.
Industry:Mining
A monoclinic mineral, 96(Cu<sub>2</sub>S) ; pseudohexagonal, metallic gray-black with blue to green tarnish; sp gr, 5.5 to 5.8; a secondary vein mineral; an important source of copper.
Industry:Mining
A monoclinic mineral, Ag<sub>16</sub>As<sub>2</sub>S<sub>11</sub>, having copper as an apparent necessary minor component; forms pseudorhombohedral tabular crystals or may be massive; metallic black; brittle; in low-to moderate-temperature silver and base-metal ores.
Industry:Mining
A monoclinic mineral, Ag<sub>3</sub>AsS<sub>3</sub>; dimorphous with proustite; brilliant red, orange-yellow to brown.
Industry:Mining
A monoclinic mineral, Ag<sub>3</sub>AsS<sub>3</sub>; dimorphous with proustite; brilliant red, orange-yellow to brown.
Industry:Mining
A monoclinic mineral, Ag<sub>3</sub>Pb<sub>6</sub>Sb<sub>11</sub>S<sub>24</sub>; forms dark-gray twinned prismatic to lanceshaped crystals; at Potosi, Bolivia. Compare: andorite
Industry:Mining
A monoclinic mineral, Ag<sub>3</sub>SbS<sub>3</sub>; dimorphous with pyrargyrite; red.
Industry:Mining