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United States Bureau of Mines
المجال: 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, Al<sub>2</sub>(F,OH)<sub>2</sub>SiO<sub>4</sub>; pseudo-orthorhombic; colorless to pale blue, pale yellow to pinkish-beige ("sherry" topaz); defines hardness 8 on the Mohs scale; in cavities in granites, granite pegmatites, and rhyolites, and in surrounding metamorphic rocks; may be of gem quality. Compare: false topaz; Scotch topaz; Spanish topaz.
Industry:Mining
A triclinic mineral, Al<sub>6</sub>(PO<sub>4</sub>)<sub>2</sub>(PO<sub>3</sub>OH)<sub>2</sub>(OH)<sub>8</sub>.4H<sub>2</sub>O ; turquoise group.
Industry:Mining
A triclinic mineral, BaCa(CO<sub>3</sub>)<sub>2</sub>; pseudo-orthorhombic and trimorphous with barytocalcite and paralstonite. Formerly called bromlite.
Industry:Mining
A triclinic mineral, Bi<sub>4</sub>O<sub>4</sub>(UO<sub>2</sub>)(AsO<sub>4</sub>).2H<sub>2</sub>O ; radioactive; yellow-orange; associated with troegerite, zeunerite, uransphaerite, torbernite, and uranospinite. Also spelled walpurgin.
Industry:Mining
A triclinic mineral, Ca<sub>10</sub>Si<sub>18</sub>O<sub>46</sub>.18H<sub>2</sub>O ; white; fibrous; commonly associated with zeolites in basalts.
Industry:Mining
A triclinic mineral, Ca<sub>2</sub>(Fe,Mg,Ti)<sub>6</sub>(Si,Al)<sub>6</sub>O<sub>20</sub>; aenigmatite group; in silicaundersaturated mafic to intermediate rocks commonly as an alteration product of amphiboles; in Germany and the Czech Republic.
Industry:Mining
A triclinic mineral, Ca<sub>2</sub>(Fe,Mn)(PO<sub>4</sub>)<sub>2</sub>.2H<sub>2</sub>O; fairfieldite group. (Not mesolite.)
Industry:Mining
A triclinic mineral, Ca<sub>2</sub>(Fe,Mn)(PO<sub>4</sub>)<sub>2</sub>.2H<sub>2</sub>O; fairfieldite group. (Not mesolite.)
Industry:Mining
A triclinic mineral, Ca<sub>2</sub>(Fe,Mn)(PO<sub>4</sub>)<sub>2</sub>.2H<sub>2</sub>O; fairfieldite group. (Not mesolite.)
Industry:Mining
A triclinic mineral, Ca<sub>2</sub>(Mg,Al)<sub>6</sub>(Si,Al,B)<sub>6</sub>O<sub>20</sub>; aenigmatite group; blue.
Industry:Mining