- 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,Ca)<sub>2</sub>(Mn,Fe)(Zr,Ti)Si<sub>2</sub>O<sub>7</sub>(O,OH,F)<sub>2</sub>. Also spelled laavenite.
Industry:Mining
A monoclinic mineral, (Na,Ca)<sub>2</sub>(Mn,Fe)<sub>3</sub>(PO<sub>4</sub>)<sub>3</sub>; alluaudite group; forms dull olivegreen granular masses; at Varutrask, Sweden.
Industry:Mining
A monoclinic mineral, (Na,Ca,Ce)<sub>3</sub>Ti(Si<sub>2</sub>O<sub>7</sub>)<sub>2</sub>OF<sub>3</sub>; weakly radioactive; forms prismatic crystals in veins containing silicates of cerium metals, yttrium, and niobium; near Barkevik, Norway, in sodalite syenite in the Julianehaab district, Greenland, and in large crystals on the Kola Peninsula, Russia. Also spelled rinkolite.
Industry:Mining
A monoclinic mineral, (Na,Ca,Ce)<sub>3</sub>Ti(Si<sub>2</sub>O<sub>7</sub>)<sub>2</sub>OF<sub>3</sub>; weakly radioactive; forms prismatic crystals in veins containing silicates of cerium metals, yttrium, and niobium; near Barkevik, Norway, in sodalite syenite in the Julianehaab district, Greenland, and in large crystals on the Kola Peninsula, Russia. Also spelled rinkolite.
Industry:Mining
A monoclinic mineral, (Na,Ca,K)<sub>4</sub>Ti<sub>4</sub>AlSi<sub>6</sub>O<sub>23</sub>(OH).2H<sub>2</sub>O ; white to colorless; forms crystals and spherical aggregates in nepheline syenite in the Kola Peninsula, Russia.
Industry:Mining
A monoclinic mineral, (Na,Ca<sub>0.5</sub>)<sub>0.3</sub>Al<sub>2</sub>(Si,Al)<sub>4</sub>O<sub>10</sub>(OH)<sub>2</sub>.nH<sub>2</sub>O ; smectite group; aluminum rich and poor in magnesium and iron; a common constituent of soils and certain clay deposits (e.g., metabentonite). Compare: montmorillonite
Industry:Mining
A monoclinic mineral, (Na,K,Ca)<sub>2</sub>Al<sub>3</sub>(Al,Si)<sub>2</sub>Si<sub>13</sub>O<sub>36</sub>.12H<sub>2</sub>O; of the zeolite group.
Industry:Mining
A monoclinic mineral, (Na,K,Ca,Mg)<sub>2</sub>(V<sub>5+</sub>,V<sub>4+</sub>)<sub>8</sub>O<sub>26</sub>.6-10H<sub>2</sub>O ; weakly radioactive; associated with carnotite in Colorado and Utah; a source of vanadium.
Industry:Mining
A monoclinic mineral, (Na,K,Ca,Mg)<sub>2</sub>(V<sub>5+</sub>,V<sub>4+</sub>)<sub>8</sub>O<sub>26</sub>.6-10H<sub>2</sub>O ; weakly radioactive; associated with carnotite in Colorado and Utah; a source of vanadium.
Industry:Mining
A monoclinic mineral, (Na,Mg,Fe)<sub>7</sub>Si<sub>4</sub>O<sub>11</sub>(OH,F) approx.; an amphibole intermediate between richterite and glaucophane; dark blue; at Itorendrika, Madagascar, and near Tine, Wadai, Africa.
Industry:Mining
