- المجال: Mining
- Number of terms: 33118
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- 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 monoclinic mineral, NaBeSi<sub>3</sub>O<sub>7</sub>(OH) ; dimorphous with epididymite; vitreous, in transparent to translucent tabular crystals with lamellar twinning having one perfect and one imperfect cleavage; in nepheline-syenite pegmatites with albite, elpidite, and analcime.
Industry:Mining
A monoclinic mineral, NaBSi<sub>2</sub>O<sub>5</sub>(OH)<sub>2</sub>; forms minute spherulites composed of radiating fibers; at Searles Lake, CA.
Industry:Mining
A monoclinic mineral, NaCa(V<sub>5+</sub>,V<sub>4+</sub>)<sub>6</sub>O<sub>16</sub>.4H<sub>2</sub>O ; in silky, pearly, or subadamantine fibrous aggregates coating fractures or forming thin seams in sandstone or limestone; near Grants, NM, and in Montrose County, CO.
Industry:Mining
A monoclinic mineral, NaCa<sub>2</sub>(Fe,Mg)<sub>5</sub>(Si<sub>7</sub>AlO<sub>22</sub>)(OH)<sub>2</sub>; amphibole group; has Mg/(Mg+Fe) = 0 to 0.49; forms a series with edenite.
Industry:Mining
A monoclinic mineral, NaCa<sub>2</sub>(Mg,Fe)<sub>4</sub>Al(Si<sub>6</sub>Al<sub>2</sub>)O<sub>22</sub>(OH)<sub>2</sub>; amphibole group; prismatic cleavage; occurs in dolomitic marbles and in skarns.
Industry:Mining
A monoclinic mineral, NaCa<sub>2</sub>(Mg,Fe)<sub>4</sub>Ti(Si<sub>6</sub>Al<sub>2</sub>)O<sub>22</sub>(OH)<sub>2</sub>; amphibole group with Mg/(Mg+Fe)= 0.5 to 1.0; forms a series with ferrokaersutite; a typical constituent of alkaline volcanic rocks.
Industry:Mining
A monoclinic mineral, NaCa<sub>2</sub>(Mg,Fe)<sub>5</sub>Si<sub>7</sub>AlO<sub>22</sub>(OH)<sub>2</sub>; amphibole group with Mg/(Mg + Fe<sub>2+</sub>) = 0.5 to 1.0; named for the type locality, Eden, NY.
Industry:Mining
A monoclinic mineral, NaCaAlF<sub>6</sub>.H<sub>2</sub>O ; dimorphous with pachnolite; forms small, white prismatic crystals on cryolite.
Industry:Mining
A monoclinic mineral, NaCaAlF<sub>6</sub>.H<sub>2</sub>O ; white; distinct cleavage; dimorphous with thomsenolite; an alteration of cryolite.
Industry:Mining
A monoclinic mineral, NaCaB<sub>5</sub>O<sub>7</sub>(OH)<sub>4</sub>.3H<sub>2</sub>O ; colorless; forms radiated columnar crystals; in Kern Country, CA.
Industry:Mining
