- المجال: 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 hexagonal mineral, Be<sub>3</sub>Al<sub>2</sub>Si<sub>6</sub>O<sub>18</sub>; green, blue-green, and other pale tints; in granite pegmatites, mica schists, and an accessory mineral in felsic igneous rocks; the chief source of beryllium. Transparent and colored gem varieties include emerald, aquamarine, morganite, heliodor, golden beryl, bixbite, and vorobievite.
Industry:Mining
A hexagonal mineral, BeMg<sub>3</sub>Al<sub>8</sub>O<sub>16</sub>; hoegbomite group; a dimorph of musgravite; violet-red.
Industry:Mining
A hexagonal mineral, Ca(OH)<sub>2</sub>; occurs in skarns; an important constituent of portland cement.
Industry:Mining
A hexagonal mineral, Ca<sub>4</sub>Mn<sub>3</sub>(BO<sub>3</sub>)<sub>3</sub>(CO<sub>3</sub>)(O,OH)<sub>3</sub>; forms prisms associated with marokite, braunite, and hasumannite in calcite from Tachgagalt, Morocco.
Industry:Mining
A hexagonal mineral, Ca<sub>5</sub>(AsO<sub>4</sub>)<sub>3</sub>F ; apatite group.
Industry:Mining
A hexagonal mineral, Ca<sub>5</sub>(PO<sub>4</sub>)<sub>3</sub>(OH) ; apatite group; an uncommon apatite in which hydroxyl predominates over fluorine and chlorine. Formerly spelled hydroxyapatite.
Industry:Mining
A hexagonal mineral, Ca<sub>5</sub>(PO<sub>4</sub>)<sub>3</sub>F ; apatite group; variably colored; commonly fluorescent or phosphorescent; defines 5 on the Mohs hardness scale; a common accessory mineral in igneous and metamorphic rocks, pegmatites, veins, and carbonate rocks; an ore of phosphate in phosphorites.
Industry:Mining
A hexagonal mineral, Ca<sub>5</sub>(PO<sub>4</sub>)<sub>3</sub>F ; apatite group; variably colored; commonly fluorescent or phosphorescent; defines 5 on the Mohs hardness scale; a common accessory mineral in igneous and metamorphic rocks, pegmatites, veins, and carbonate rocks; an ore of phosphate in phosphorites.
Industry:Mining
A hexagonal mineral, Ca<sub>5</sub>(SiO<sub>4</sub>,PO<sub>4</sub>,SO<sub>4</sub>)<sub>3</sub>(F,OH,Cl) ; apatite group; it is chlorellestadite if (Cl>OH,F), fluorellestadite if (F>OH,Cl), or hydroxylellestadite if (OH>F,Cl). Hydroxylellestadite occurs as veinlets in blue calcite associated with wilkeite, idocrase, and similar contact metamorphic minerals at Crestmore, Riverside County, CA.
Industry:Mining
A hexagonal mineral, Ca<sub>6</sub>Si<sub>2</sub>(CO<sub>3</sub>)<sub>2</sub>(SO<sub>4</sub>)<sub>2</sub>(OH)<sub>12</sub>.24H<sub>2</sub>O ; white; fibrous.
Industry:Mining
