- 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 monoclinic mineral, Ca<sub>2</sub>(IO<sub>3</sub>)<sub>2</sub>(CrO<sub>4</sub>) ; dark golden-yellow; forms prismatic, tabular, fibrous, or columnar crystals; at Atacama, Peru.
Industry:Mining
A monoclinic mineral, Ca<sub>2</sub>(Mg,Fe)<sub>3</sub>Al<sub>2</sub>(Si<sub>6</sub>Al<sub>2</sub>)O<sub>22</sub>(OH)<sub>2</sub>; amphibole group, having Mg/(Mg + Fe) = 0.5 to 1.0 ; forms a series with ferrotschermakite.
Industry:Mining
A monoclinic mineral, Ca<sub>2</sub>Al<sub>4</sub>Si<sub>4</sub>O<sub>16</sub>.9H<sub>2</sub>O ; zeolite group; pseudotetragonal; vitreous, transparent to translucent; in cavities in leucitic tephrites and related lavas; also zeolite zones in basaltic lavas where it is associated with chabazite, thomsonite, and phillipsite. Also spelled gismondite.
Industry:Mining
A monoclinic mineral, Ca<sub>2</sub>B<sub>14</sub>O<sub>23</sub>.8H<sub>2</sub>O ; transparent to translucent; occurs as pellets embedded in a matrix of sassolite and clay within colemanite-veined basalt at Death Valley, CA; also as minute lozenge-shaped plates aggregated into masses with calcite in veins in sandstone at Sasso Pisano, Tuscany, Italy. Compare: strontioginorite
Industry:Mining
A monoclinic mineral, Ca<sub>2</sub>B<sub>5</sub>SiO<sub>9</sub>(OH)<sub>5</sub>; white; earthy or in small nodules; in the Mojave Desert region of California.
Industry:Mining
A monoclinic mineral, Ca<sub>2</sub>B<sub>6</sub>O<sub>6</sub>(OH)<sub>10</sub>.8H<sub>2</sub>O ; forms large, soft, colorless, tabular crystals associated with colemanite and other boron minerals in Inyo County, CA; dehydrates to meyerhoffite.
Industry:Mining
A monoclinic mineral, Ca<sub>2</sub>Cu(UO<sub>2</sub>)(CO<sub>3</sub>)<sub>4</sub>.6H<sub>2</sub>O(?) ; strongly radioactive; emerald to grass green; an alteration product of uraninite associated with liebigite.
Industry:Mining
A monoclinic mineral, Ca<sub>2</sub>Fe<sub>3</sub>(PO<sub>4</sub>)<sub>3</sub>O<sub>2</sub>.3H<sub>2</sub>O ; forms red crystals, green stains in granite pegmatites.
Industry:Mining
A monoclinic mineral, Ca<sub>3</sub>Al<sub>2</sub>(SO<sub>4</sub>)(F,OH)<sub>10</sub>.2H<sub>2</sub>O .
Industry:Mining
A monoclinic mineral, Ca<sub>3</sub>Mg(SiO<sub>4</sub>)<sub>2</sub>; colorless to pale green.
Industry:Mining
