- 行业: 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 tetragonal mineral, Ca<sub>2</sub>Al(AlSi)O<sub>7</sub>; melilite group; forms a series with akermanite; a common constituent of feldspathoidal rocks formed by reaction of mafic magmas with carbonate rocks.
Industry:Mining
A tetragonal mineral, Ca<sub>2</sub>B(AsO<sub>4</sub>)(OH)<sub>4</sub>; forms white sphenoidal crystals.
Industry:Mining
A tetragonal mineral, Ca<sub>9</sub>Al<sub>2</sub>V<sub>28</sub>O<sub>80</sub>.56H<sub>2</sub>O ; blue-black.
Industry:Mining
A tetragonal mineral, CaBi(CO<sub>3</sub>)OF ; in pegmatite from Krupka, Czech Republic.
Industry:Mining
A tetragonal mineral, CaCrO<sub>4</sub>; forms finely crystalline citron-yellow crusts from clefts in limestones.
Industry:Mining
A tetragonal mineral, CaCuSi<sub>4</sub>O<sub>10</sub>; in small blue grains at Mt. Vesuvius, Italy.
Industry:Mining
A tetragonal mineral, CaMoO<sub>4</sub>; forms a series with scheelite as tungsten replaces molybdenum; a minor source of molybdenum in Idaho, Michigan, Nevada, and California, and Siberia, Russia.
Industry:Mining
A tetragonal mineral, CaWO<sub>4</sub>, with molybdenum replacing tungsten toward powellite CaMoO<sub>4</sub>; prismatic cleavage; sp gr, 5.9 to 6.1; varicolored, fluoresces bright blue; in limestone and pneumatolitic veins near granite contacts, granite pegmatites; a source of tungsten.
Industry:Mining
A tetragonal mineral, CO(NH<sub>2</sub>)<sub>2</sub>. Carbonyl diamide; also called carbamide.
Industry:Mining
A tetragonal mineral, Cu(UO<sub>2</sub>)<sub>2</sub>(AsO<sub>4</sub>)<sub>2</sub>.10H<sub>2</sub>O ; autunite group.
Industry:Mining
