- 行业: 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 ...
An orthorhombic mineral, 8(Mg<sub>6</sub>B<sub>14</sub>O<sub>26</sub>Cl<sub>2</sub>) ; isometric above 265 degrees C in hard, glassy, cubic and octahedral crystals; strongly pyroelectric; in evaporites, a source of boron.
Industry:Mining
An orthorhombic mineral, 8(TiO<sub>2</sub>) ; trimorphous with anatase and rutile; a common accessory mineral in igneous and metamorphic rocks, and placers. See: titanium dioxide
Industry:Mining
An orthorhombic mineral, Ag<sub>2</sub>S ; isometric above 180 degrees C; dimorphous with acanthite; massive or as coating; metallic lead-gray; soft, sectile; sp gr, 7.3; in veins with 162 other silver and sulfide minerals; commonly pseudomorphous after acanthite; an important ore of silver.
Industry:Mining
An orthorhombic mineral, Ag<sub>2</sub>S ; isometric above 180 degrees C; dimorphous with acanthite; massive or as coating; metallic lead-gray; soft, sectile; sp gr, 7.3; in veins with 162 other silver and sulfide minerals; commonly pseudomorphous after acanthite; an important ore of silver.
Industry:Mining
An orthorhombic mineral, Ag<sub>2</sub>S ; isometric above 180 degrees C; dimorphous with acanthite; massive or as coating; metallic lead-gray; soft, sectile; sp gr, 7.3; in veins with 162 other silver and sulfide minerals; commonly pseudomorphous after acanthite; an important ore of silver.
Industry:Mining
An orthorhombic mineral, Ag<sub>2</sub>S ; isometric above 180 degrees C; dimorphous with acanthite; massive or as coating; metallic lead-gray; soft, sectile; sp gr, 7.3; in veins with 162 other silver and sulfide minerals; commonly pseudomorphous after acanthite; an important ore of silver.
Industry:Mining
An orthorhombic mineral, Ag<sub>2</sub>Se ; pseudocubic; black; lustrous; forms heavy, sectile granular masses; also in thin plates; epithermal; a major source of silver in some deposits.
Industry:Mining
An orthorhombic mineral, Ag<sub>3</sub>Sb ; metallic silver-white, commonly tarnished; sp gr, 9.74; in veins with galena, native silver, and silver sulfosalts; an ore of silver.
Industry:Mining
An orthorhombic mineral, Ag<sub>5</sub>SbS<sub>4</sub>; soft; metallic; sp gr, 6.2 to 6.3; in veins; a source of silver.
Industry:Mining
