- 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, Na<sub>4</sub>MnTi(Zr<sub>1.5</sub>Ti<sub>0.5</sub>)O<sub>2</sub>(F,OH)(Si<sub>2</sub>O<sub>7</sub>) ; forms brown-red needles embedded in microcline in a nepheline syenite pegmatite; near Lake Seidozero, Lovozero massif, Kola Peninsula, Russia.
Industry:Mining
A monoclinic mineral, Na<sub>6</sub>Mg(SO<sub>4</sub>)<sub>4</sub>; colorless; at Wilhelmshall, Stassfurt, Germany.
Industry:Mining
A monoclinic mineral, NaAl(AsO<sub>4</sub>)F ; occurs with cassiterite at the Barranca tin mine, Durango, Mexico.
Industry:Mining
A monoclinic mineral, NaAl(PO<sub>4</sub>)F ; isostructural with durangite; in cavities in granite pegmatites.
Industry:Mining
A monoclinic mineral, NaAl<sub>2</sub>(AlSi<sub>3</sub>)O<sub>10</sub>(OH)<sub>2</sub>; mica group; pseudohexagonal with basal cleavage; forms fine-grained, massive, scaly aggregates; occurs in metamorphic rocks and in soils; not common as it is incompatible with potassium feldspar (albite plus muscovite is more stable); rarely identified because of its similarity to muscovite.
Industry:Mining
A monoclinic mineral, NaAl<sub>2</sub>(AlSi<sub>3</sub>)O<sub>10</sub>(OH)<sub>2</sub>; mica group; pseudohexagonal with basal cleavage; forms fine-grained, massive, scaly aggregates; occurs in metamorphic rocks and in soils; not common as it is incompatible with potassium feldspar (albite plus muscovite is more stable); rarely identified because of its similarity to muscovite.
Industry:Mining
A monoclinic mineral, NaAl<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>(OH)<sub>4</sub>; yellow-green; also spelled brasilianite, brasilianita.
Industry:Mining
A monoclinic mineral, NaAl<sub>8</sub>V<sub>10</sub>O<sub>38</sub>.30H<sub>2</sub>O ; forms bright-yellow incrustations on weathered shales; in northwest Kara-Tau, Kazakhstan.
Industry:Mining
A monoclinic mineral, NaBePO<sub>4</sub>; colorless or yellow; forms transparent, topazlike pseudo-orthorhombic crystals.
Industry:Mining
