- 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 monoclinic mineral, 4(beta-Ca<sub>2</sub>SiO<sub>4</sub>) ; gray; in contact metamorphosed limestone. Compare: bredigite
Industry:Mining
A monoclinic mineral, 4(CaBe(PO<sub>4</sub>)F) , with OH replacing F toward hydroxylherderite; pseudo-orthorhombic prismatic crystals or radiated fibrous aggregates; in late-stage pegmatites.
Industry:Mining
A monoclinic mineral, 4(CaFeSi<sub>2</sub>O<sub>6</sub>) ; pyroxene group; forms series with diopside and johannsenite; a common rock-forming mineral in iron-rich metamorphic rocks, limestone skarns, and fayalite-bearing plutonic rocks.
Industry:Mining
A monoclinic mineral, 4(CaMnSi<sub>2</sub>O<sub>6</sub>) ; pyroxene group; forms series with diopside and hedenbergite; shows clove-brown to grayish-green columnar, radiating, and spherulitic aggregates of fibers and prisms with black tarnish; in metasomatized limestones with manganese ore. Occurs at Puebla and Hildago, Mexico; Lane County, OR; Franklin, NJ; and Schio, Venetia, Italy.
Industry:Mining
A monoclinic mineral, 4(Na<sub>2</sub>(H<sub>2</sub>O)<sub>3</sub>B<sub>4</sub>O<sub>6</sub>(OH)<sub>2</sub>) ; soft, colorless to white; in the Mojave Desert and Kern County, CA; a major source of borax and boron compounds in the United States.
Industry:Mining
A monoclinic mineral, 4(NaAlSi<sub>2</sub>O<sub>6</sub>) ; pyroxene group; apple green to emerald green, white, lavender, tomato red, or brown; tough; associated with albite from high-pressure, low-temperature metamorphosed plagioclase; an ornamental stone called "jade" (along with nephrite).
Industry:Mining
A monoclinic mineral, 8((Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)<sub>2</sub>O<sub>6</sub>) ; pyroxene group; darkgreen to black with prismatic cleavage; a common rock-forming mineral in igneous and metamorphic rocks.
Industry:Mining
A monoclinic mineral, 8((Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)<sub>2</sub>O<sub>6</sub>) ; pyroxene group; darkgreen to black with prismatic cleavage; a common rock-forming mineral in igneous and metamorphic rocks.
Industry:Mining
A monoclinic mineral, 8((Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)<sub>2</sub>O<sub>6</sub>) ; pyroxene group; darkgreen to black with prismatic cleavage; a common rock-forming mineral in igneous and metamorphic rocks.
Industry:Mining
A monoclinic mineral, 8((Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)<sub>2</sub>O<sub>6</sub>) ; pyroxene group; darkgreen to black with prismatic cleavage; a common rock-forming mineral in igneous and metamorphic rocks.
Industry:Mining
