- 行业: 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 ...
An orthorhombic mineral series, 8((Mg,Fe)<sub>2</sub>Si<sub>2</sub>O<sub>6</sub>) ; pyroxene group, intermediate between enstatite and ferrosilite; prismatic cleavage; a common rock-forming mineral in intermediate to mafic igneous rocks and high-grade metamorphosed iron formations of the Lake Superior type; abundant in host rocks of copper-nickel ores of Sudbury, ON, Canada, and of chromite deposits of the Bushveld complex, South Africa.
Industry:Mining
An orthorhombic mineral, (Ba,Pb)(UO<sub>2</sub>)<sub>2</sub>(VO<sub>4</sub>)<sub>2</sub>.5H<sub>2</sub>O ; forms a series with curienite; occurs as yellow impregnations in sandstone; from Franceville, Gabon.
Industry:Mining
An orthorhombic mineral, (Ca,Ce,Na)(Nb,Ta,Ti)<sub>2</sub>(O,OH,F)<sub>6</sub>; weakly radioactive; in syenites, may be associated with pyrochlore, alkali hornblende, apatite, sphene, magnetite, zircon, xenotime, or allanite; also in some marbles with columbite and monazite.
Industry:Mining
An orthorhombic mineral, (Ca,Fe,Y,Th)(Nb,Ti,Ta,Zr)O<sub>4</sub>; radioactive; in syenites and granite pegmatites. Also spelled polymignyte.
Industry:Mining
An orthorhombic mineral, (Ca,Na<sub>2</sub>,K<sub>2</sub>)<sub>8</sub>Si<sub>16</sub>O<sub>40</sub>.11H<sub>2</sub>O ; fibrous; resembles zeolites; at Bultfontein Mine, Kimberley, South Africa.
Industry:Mining
An orthorhombic mineral, (Ce,Ca,Fe,Th)(Ti,Nb)<sub>2</sub>(O,OH)<sub>6</sub>; radioactive; occurs in black sands and pegmatites.
Industry:Mining
An orthorhombic mineral, (Ce,La)<sub>2</sub>(CO<sub>3</sub>)<sub>3</sub>.4H<sub>2</sub>O ; pale yellow; a source of rare-earth elements.
Industry:Mining
An orthorhombic mineral, (Ce,La,Nd)<sub>2</sub>(CO<sub>3</sub>)<sub>3</sub>.8H<sub>2</sub>) ; further speciated according to its predominant rare-earth element; in pegmatites and carbonate-rich sediments.
Industry:Mining
An orthorhombic mineral, (Co,Fe)AsS ; pseudocubic, dimorphous with alloclasite; in metallic prismatic crystals, or massive in cobalt ores with cobaltite and pyrite. Also spelled glaukodot.
Industry:Mining
An orthorhombic mineral, (Cu,Fe)Fe<sub>3</sub>(PO<sub>4</sub>)<sub>3</sub>(OH)<sub>2</sub>; in bluish-green globules with radial structure.
Industry:Mining
