- 行业: 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 ...
An orthorhombic mineral, Ca<sub>2</sub>Al<sub>2</sub>Si<sub>3</sub>O<sub>10</sub>(OH)<sub>2</sub>, in which Fe replaces Al; forms botryoidal or mammillary and radiating aggregates. Occurs in: hydrothermal veins, cavities, and amygdules in basalt; veins in felsic plutonic rocks; and low-grade metamorphic rocks. Commonly associated with zeolites.
Industry:Mining
An orthorhombic mineral, Ca<sub>2</sub>Cu<sub>9</sub>(AsO<sub>4</sub>)<sub>4</sub>(OH)<sub>10</sub>.10H<sub>2</sub>O ; forms green crystal aggregates having foliated micaceous structure. Formerly called trichalcite.
Industry:Mining
An orthorhombic mineral, Ca<sub>2</sub>Mn<sub>2+</sub>Mn<sub>3+ 2</sub>Si<sub>3</sub>O<sub>10</sub>(OH)<sub>4</sub>; forms minute, brown to black, radiating, prismatic crystals.
Industry:Mining
An orthorhombic mineral, Ca<sub>2</sub>Mn<sub>2</sub>B<sub>4</sub>O<sub>7</sub>(OH)<sub>6</sub>; forms a series with fedorovskite; forms light brown laths; at Franklin, NJ.
Industry:Mining
An orthorhombic mineral, Ca<sub>3</sub>U(UO<sub>2</sub>)<sub>6</sub>(CO<sub>3</sub>)<sub>2</sub>(OH)<sub>18</sub>.3-5) H<sub>2</sub>O ; violet-black; occurs with ianthinite altered from uraninite; at Shinkolobwe, Katanga, Republic of the Congo.
Industry:Mining
An orthorhombic mineral, Ca<sub>3</sub>V<sub>12</sub>O<sub>32</sub>.12H<sub>2</sub>O ; in black fibrous crystals in Montrose County, CA, and San Juan County, NM.
Industry:Mining
An orthorhombic mineral, Ca<sub>6</sub>Mg<sub>2</sub>(SO<sub>4</sub>)<sub>2</sub>(CO<sub>3</sub>)<sub>2</sub>Cl<sub>4</sub>(OH)<sub>4</sub>.7H<sub>2</sub>O ; with anhydrite in saline strata of the Caspian depression.
Industry:Mining
An orthorhombic mineral, Ca<sub>7</sub>Mg(SiO<sub>4</sub>)<sub>4</sub>; pseudohexagonal. Compare: larnite
Industry:Mining
An orthorhombic mineral, Ca<sub>9</sub>Si<sub>12</sub>O<sub>30</sub>(OH)<sub>6</sub>.4H<sub>2</sub>O ; the principal cementing compound in Portland cement.
Industry:Mining
An orthorhombic mineral, CaAl<sub>3</sub>(SiO<sub>4</sub>)<sub>3</sub>(OH)) ; epidote group; dimorphous with clinozoisite; vitreous or pearly; varicolored; a common rock-forming mineral in mediumgrade metamorphic rocks. The rose-red variety has been called thulite.
Industry:Mining
