- Industry: Mining
- Number of terms: 33118
- Number of blossaries: 0
- 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 isometric mineral, 8(Fe<sub>2</sub>TiO<sub>4</sub>) ; spinel group; in mafic igneous rocks as fine exsolution lamellae in magnetite. Named for the Ulvoe Islands, Sweden.
Industry:Mining
An isometric mineral, 8(Fe<sub>2</sub>TiO<sub>4</sub>) ; spinel group; in mafic igneous rocks as fine exsolution lamellae in magnetite. Named for the Ulvoe Islands, Sweden.
Industry:Mining
An isometric mineral, 8(FeCr<sub>2</sub>O<sub>4</sub>) ; spinel group; dimorphous with donathite; forms crystal-solution series with magnesiochromite in the chromite series of the spinel group, and with hercynite; rarely occurs as a pure end member. End-member chromite contains 68% Cr<sub>2</sub>O<sub>3</sub>, but natural minerals do not commonly exceed 50%. Occurs in metallic black octahedral crystals; weakly to moderately ferrimagnetic; an accessory in, or layers in, mafic and ultramafic rocks; also in black sands, the major source of chromium.
Industry:Mining
An isometric mineral, 8(FeCr<sub>2</sub>O<sub>4</sub>) ; spinel group; dimorphous with donathite; forms crystal-solution series with magnesiochromite in the chromite series of the spinel group, and with hercynite; rarely occurs as a pure end member. End-member chromite contains 68% Cr<sub>2</sub>O<sub>3</sub>, but natural minerals do not commonly exceed 50%. Occurs in metallic black octahedral crystals; weakly to moderately ferrimagnetic; an accessory in, or layers in, mafic and ultramafic rocks; also in black sands, the major source of chromium.
Industry:Mining
An isometric mineral, 8(MnFe<sub>2</sub>O<sub>4</sub>) ; spinel group; occurs with manganese ores.
Industry:Mining
An isometric mineral, 8(ZnFe<sub>2</sub>O<sub>4</sub>) ; magnetite series; spinel group; forms metallic black octahedra with rounded edges; weakly ferrimagnetic; a source of zinc at the Franklin and the Sterling Hill deposits, NJ.
Industry:Mining
An isometric mineral, Ag<sub>2</sub>Hg<sub>3</sub>; a silver-white amalgam; sp gr, 13.5. Named for the locality in Bavaria, Germany.
Industry:Mining
An isometric mineral, Ag<sub>3</sub>AuTe<sub>2</sub>; metallic; steel gray to iron black; massive; sp gr, 8.7 to 9.02; in gold-bearing telluride veins; may be a significant source of gold and silver.
Industry:Mining
An isometric mineral, Al<sub>13</sub>Si<sub>5</sub>O<sub>20</sub>(OH,F)<sub>18</sub>Cl; occurs in transparent tetrahedral crystals, also minute cubes; at the Zuni Mine, Silverton, CO. Also spelled zungite.
Industry:Mining
An isometric mineral, Au<sub>2</sub>Bi ; pink to silver-white; intermetallic compound.
Industry:Mining
