- 行业: Mining
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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 monoclinic and hexagonal mineral, FeS ; invariably deficient in iron; variably ferrimagnetic; metallic; bronze yellow with iridescent tarnish; in mafic igneous rocks, contact metamorphic deposits, high-temperature veins, and granite pegmatites. Where associated with pentlandite and nickel replaces iron, it is a source of nickel. Also spelled pyrrhotine.
Industry:Mining
A monoclinic and orthorhombic mineral, UO<sub>2</sub>MoO<sub>4</sub>.4H<sub>2</sub>O ; black to blue-black; secondary; the only known uranium mineral to contain molybdenum.
Industry:Mining
A monoclinic and triclinic mineral, 4(SiO<sub>2</sub>) ; pseudohexagonal; polymorphous with coesite, cristobalite, quartz, and stishovite; colorless to white; in felsic volcanics and refractories. Also spelled tridimite.
Industry:Mining
A monoclinic and triclinic mineral, Ca(Fe,Mn)<sub>2</sub>Be<sub>3</sub>(PO<sub>4</sub>)<sub>3</sub>(OH)<sub>3</sub>.2H<sub>2</sub>O .
Industry:Mining
A monoclinic and triclinic mineral, Ca<sub>6</sub>Si<sub>6</sub>O<sub>17</sub>(OH)<sub>2</sub>; light-gray to pink; fibrous; in serpentinites in Santa Barbara, CA, and on Isle Royale, MI.
Industry:Mining
A monoclinic and triclinic mineral, K(Mg,Fe)<sub>8</sub>(Si,Al)<sub>12</sub>(O,OH)<sub>27</sub>(?) ; black to greenblack; in micalike plates, fibrous forms, and velvety bronze-colored incrustations.
Industry:Mining
A monoclinic and triclinic mineral, K(Mg,Fe)<sub>8</sub>(Si,Al)<sub>12</sub>(O,OH)<sub>27</sub>(?) ; black to greenblack; in micalike plates, fibrous forms, and velvety bronze-colored incrustations.
Industry:Mining
A monoclinic and triclinic mineral, LiAlSi<sub>2</sub>O<sub>6</sub>.H<sub>2</sub>O; may be in zeolite group; colorless or white; in granular aggregates with eucryptite in lithia pegmatites.
Industry:Mining
A monoclinic and triclinic mineral, Na<sub>2</sub>ZrSi<sub>4</sub>O<sub>11</sub>; forms colorless crystals in the contact zone of the Lovozero massif, Kola Peninsula, Russia. It is related to narsarsukite.
Industry:Mining
A monoclinic copper magnesium sulfate in bluish-green crusts at Mt. Vesuvius, Italy; of doubtful validity.
Industry:Mining
