- 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 tetragonal mineral, Th(SiO<sub>4</sub>)<sub>1-x</sub>(OH)<sub>4x</sub>; may contain up to 31% uranium; has zircon structure. Differs from thorite (1) in being secondary, formed by the alteration of primary thorium minerals including thorite itself; (2) in not being metamict but forming crystalline aggregates; and (3) in containing essential (OH).
Industry:Mining
A tetragonal mineral, ThCa<sub>2</sub>Si<sub>8</sub>O<sub>20</sub>; radioactive; metamict; from the gem pits of Eheliyagoda, Raknapura district, Sri Lanka; as fine crystals at the Mont St. Hilare Quarry, PQ, Canada.
Industry:Mining
A tetragonal mineral, YPO<sub>4</sub>; commonly includes small quantities of thorium, uranium, and rare-earth elements; resembles zircon in form, structure, and occurrence; shows pale tints; an accessory in granites and pegmatites; also occurs in placers.
Industry:Mining
A tetragonal mineral, YTaO<sub>4</sub>; dimorphous with yttrotantalite; forms a series with fergusonite; in granite pegmatites and placer deposits.
Industry:Mining
A tetragonal mineral, ZrSiO<sub>4</sub>; occurs widely in granite, granite pegmatite, other felsic igneous rocks, and placers; the chief source of zirconium; a refractory; if cut and polished, the colorless varieties provide exceptionally brilliant gemstones.
Industry:Mining
A tetragonal mineral, ZrSiO<sub>4</sub>; occurs widely in granite, granite pegmatite, other felsic igneous rocks, and placers; the chief source of zirconium; a refractory; if cut and polished, the colorless varieties provide exceptionally brilliant gemstones.
Industry:Mining
A tetragonal mineral, ZrSiO<sub>4</sub>; occurs widely in granite, granite pegmatite, other felsic igneous rocks, and placers; the chief source of zirconium; a refractory; if cut and polished, the colorless varieties provide exceptionally brilliant gemstones.
Industry:Mining
A tetragonal mineral, ZrSiO<sub>4</sub>; occurs widely in granite, granite pegmatite, other felsic igneous rocks, and placers; the chief source of zirconium; a refractory; if cut and polished, the colorless varieties provide exceptionally brilliant gemstones.
Industry:Mining
A textural term applied by Shand in 1906 to the intergrowth of sodalite with orthoclase in borolanite and its associates. The sodalite is altered to pinitic mica and appears in threadlike or vermicular aggregates closely packed in a matrix of orthoclase.
Industry:Mining
