- Industry: Mining
- Number of terms: 33118
- Number of blossaries: 0
- 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 ...
An orthorhombic mineral, (Y,Ca,Ce,U,La,Th)(Nb,Ta,Ti)<sub>2</sub>O<sub>6</sub>; forms a series with polycrase; brilliant to vitreous brown to black; in pegmatites and placers commonly with monazite in Canada; Madagascar; Norway; and Pennsylvania. A source of uranium, niobium, and tantalum. Formerly called loranskite.
Industry:Mining
An orthorhombic mineral, (Y,Ca,Ce,U,Th)(Ti,Nb,Ta)<sub>2</sub>O<sub>6</sub>; black; in granite pegmatites. Formerly spelled polykras.
Industry:Mining
An orthorhombic mineral, (Y,Ca,Fe,Th)(Ti,Nb)<sub>2</sub>(O,OH)<sub>6</sub>; now formally named aeschynite-(Y); forms series with aeschynite-(Ce) and with tantalaeschynite-(Y); black; forms with other rare-earth minerals in granite pegmatites and placers.
Industry:Mining
An orthorhombic mineral, (Y,Ca,Fe,Th)(Ti,Nb)<sub>2</sub>(O,OH)<sub>6</sub>; now formally named aeschynite-(Y); forms series with aeschynite-(Ce) and with tantalaeschynite-(Y); black; forms with other rare-earth minerals in granite pegmatites and placers.
Industry:Mining
An orthorhombic mineral, (Y,Ce,Ca)(Ta,Nb,Ti)<sub>2</sub>(O,OH)<sub>6</sub>; black.
Industry:Mining
An orthorhombic mineral, (Y,Ce,Ca)(Ta,Nb,Ti)<sub>2</sub>(O,OH)<sub>6</sub>; black.
Industry:Mining
An orthorhombic mineral, (Y,Th,Ca,U)(Ti,Fe)<sub>2</sub>(O,OH)<sub>6</sub>; also contains Th, U, Fe; radioactive; black altering to a dull brown coating; in granite pegmatites.
Industry:Mining
An orthorhombic mineral, (Y,U,Fe) (Ta,Nb)O<sub>4</sub>; radioactive; black to brown: in pegmatites.
Industry:Mining
An orthorhombic mineral, 2(MgSiO<sub>3</sub>) ; pyroxene group; dimorphous with clinoenstatite; a common rock-forming mineral in basalt, gabbro, norite, pyroxenite, and peridotite. Formerly called amblystegite, bronzite, chladnite, ficinite, hypersthene (in part), orthobronzite, orthoenstatite, orthohypersthene (in part), paulite, peckhamite, protobasite, shepardite, and victorite.
Industry:Mining
An orthorhombic mineral, 4((Mg,Fe)<sub>7</sub>Si<sub>8</sub>O<sub>22</sub>(OH)<sub>2</sub>) ; amphibole group; commonly lamellar or fibrous, green to clove-brown; in schists from metamorphosed ultramafic rocks; a nonspinning grade of asbestos.
Industry:Mining
