- 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 ...
A triclinic mineral, (Na,Ca)((Si,Al)AlSi<sub>2</sub>O<sub>8</sub>) ; plagioclase series of the feldspar group; has NaSi (albite) 10 to 30 mol % and CaAl (anorthite) 90 to 70 mol %; pseudomonoclinic with prismatic cleavage and characteristic polysynthetic twinning commonly visible on cleavage traces; white; may be chatoyant; a common rock-forming 2163 mineral in igneous and metamorphic rocks of intermediate to high silica content; forms the entire mass in some anorthosites; less commonly a vein mineral.
Industry:Mining
A triclinic mineral, (Na,Li)Al(PO<sub>4</sub>)(OH,F) ; amblygonite group; in granitic pegmatites associated with other lithium minerals. Formerly called fremontite.
Industry:Mining
A triclinic mineral, (NH<sub>4</sub>)<sub>3</sub>H(SO<sub>4</sub>)<sub>2</sub>; a decomposition product of pyrite in coal.
Industry:Mining
A triclinic mineral, (Pb,Sn)<sub>6</sub>FeSn<sub>2</sub>Sb<sub>2</sub>S<sub>14</sub>; forms imperfect, radiated folia. Occurs at Poopo, Llallagua, and several other tin districts of Bolivia; at Coal River, UT; in Canada; and in Inyo and Santa Cruz Counties, CA.
Industry:Mining
A triclinic mineral, (Zn,Cu)<sub>3</sub>(AsO<sub>4</sub>)<sub>2</sub>; blue; at Tsumeb, Namibia.
Industry:Mining
A triclinic mineral, (Zn,Cu)Al<sub>6</sub>(PO<sub>4</sub>)<sub>4</sub>(OH)<sub>8</sub>.4H<sub>2</sub>O ; turquoise group; in fine grained apple-green masses in Eureka County, NV.
Industry:Mining
A triclinic mineral, (Cu(UO<sub>2</sub>)<sub>2</sub>(SO<sub>4</sub>)<sub>2</sub>(OH)<sub>2</sub>.8H<sub>2</sub>O) ; radioactive; forms soft, bittertasting crystals that are polysynthetically twinned in two directions; in druses and reniform masses; at Joachimsthal, Czech Republic, and Gilpin County, CO; associated with gypsum.
Industry:Mining
A triclinic mineral, 4((Na,K)AlSi<sub>3</sub>O<sub>8</sub>) ; feldspar group; occurs in tabular crystals with prismatic cleavage; colorless or white; in felsic volcanic rocks. Compare: orthoclase
Industry:Mining
A triclinic mineral, Ag(Sb,Bi)S<sub>2</sub>; iron black with perfect cleavage; at Chocaya, Bolivia.
Industry:Mining
A triclinic mineral, Al(OH)<sub>3</sub>; cryptocrystalline; a constituent of strongly weathered soils, of laterites and bauxites.
Industry:Mining
