- المجال: Mining
- Number of terms: 33118
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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 trigonal mineral, Fe<sub>3+ 2</sub>(SO<sub>4</sub>)<sub>3</sub>.9H<sub>2</sub>O ; dimorphous with coquimbite; pale violet; astringent tasting; secondary; in oxidized iron sulfide deposits.
Industry:Mining
A trigonal mineral, K<sub>2</sub>Ca(CO<sub>3</sub>)<sub>2</sub>; dimorphous with fairchildite. Also spelled buetschliite.
Industry:Mining
A trigonal mineral, K<sub>2</sub>Sr(SO<sub>4</sub>)<sub>2</sub>; occurs in prisms and plates with anhydrite and dolomite in a drill core from Alshtan, Bashkir, Russia.
Industry:Mining
A trigonal mineral, K<sub>3</sub>Na<sub>8</sub>Fe(SO<sub>4</sub>)<sub>6</sub>(NO<sub>3</sub>)<sub>2</sub>.6H<sub>2</sub>O ; in thick, tabular rhombohedral crystals; at Chuquicamata, Chile.
Industry:Mining
A trigonal mineral, K<sub>3</sub>NaFeCl<sub>6</sub>; colorless to varicolored; becomes brown on exposure to air and has an astringent taste.
Industry:Mining
A trigonal mineral, K<sub>4</sub>MnCl<sub>6</sub>; occurs in yellow rhombohedra.
Industry:Mining
A trigonal mineral, KFe<sub>3</sub>(SO<sub>4</sub>)<sub>2</sub>(OH)<sub>6</sub>; alunite group; amber yellow to dark brown; forms druses of minute crystals, crusts, and coatings; may be fibrous or fine-grained and massive; associated with volcanic rocks; thought to form under solfataric conditions at elevated temperatures and pressures; in some places with alunite; at many localities in the Western United States, Bolivia, Europe, and Russia.
Industry:Mining
A trigonal mineral, LiAlSiO<sub>4</sub>; transparent, vitreous; fluoresces pink in UV light; Mohs hardness = 6-1/2; forms with albite in pegmatites. If heated, beta-eucryptite expands normal to the c axis, but contracts parallel to c.
Industry:Mining
A trigonal mineral, Mg<sub>6</sub>Cr<sub>2</sub>(CO<sub>3</sub>)(OH)<sub>16</sub>.4H<sub>2</sub>O ; hydrotalcite group; dimorphous with barbertonite; lilac colored; in Dundas, Tasmania, Australia; Transvaal, South Africa; Cunningsburgh, Shetland Islands; and Quebec, Canada.
Industry:Mining
A trigonal mineral, Mg<sub>6</sub>Fe<sub>2</sub>(CO<sub>3</sub>)(OH)<sub>16</sub>.4H<sub>2</sub>O ; hydrotalcite group; dimorphous with sjoegrenite; occurs in goldlike submetallic scales, or brown crystals having pearly to greasy luster. A silvery white variety is called igelstromite.
Industry:Mining
