- 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 trigonal mineral, (H<sub>3</sub>O)Fe<sub>3</sub>(SO<sub>4</sub>)<sub>2</sub>(OH)<sub>6</sub>; alunite group.
Industry:Mining
A trigonal mineral, (La,Ce)(Y,U,Fe)(Ti,Fe)<sub>20</sub>(O,OH)<sub>38</sub>; crichtonite group; radioactive; metamict; in high-temperature hydrothermal veins, pegmatites, and mafic igneous rocks; occurs in all stages of intergrowth and exsolution with ilmenite and hematite, and is an ore of uranium.
Industry:Mining
A trigonal mineral, (La,Ce)(Y,U,Fe)(Ti,Fe)<sub>20</sub>(O,OH)<sub>38</sub>; crichtonite group; radioactive; metamict; in high-temperature hydrothermal veins, pegmatites, and mafic igneous rocks; occurs in all stages of intergrowth and exsolution with ilmenite and hematite, and is an ore of uranium.
Industry:Mining
A trigonal mineral, (La,Nd,Ce)Al<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>(OH)<sub>6</sub>; crandallite group; further speciated according to which rare-earth element predominates; weakly radioactive; pale yellow; in schists, carbonatites, pegmatites, and placer sands.
Industry:Mining
A trigonal mineral, (Mn,Ca)<sub>4</sub>(Mn,Fe)<sub>9</sub>SbSi<sub>2</sub>O<sub>24</sub>; in skarns. Also spelled laangbanite. (Not langbeinite.)
Industry:Mining
A trigonal mineral, (Mn,Fe)<sub>16</sub>Si<sub>12</sub>As<sub>3</sub>O<sub>36</sub>(OH)<sub>17</sub>; dimorphous with nelenite; reddishbrown.
Industry:Mining
A trigonal mineral, (Mn,Mg,Zn)<sub>22</sub>(AsO<sub>3</sub>)(AsO<sub>4</sub>)<sub>3</sub>(SiO<sub>4</sub>)<sub>3</sub>(OH)<sub>20</sub>; reddish-bronze; forms granular masses with perfect basal cleavage. Also spelled macgovernite.
Industry:Mining
A trigonal mineral, (NH<sub>4</sub>)Fe<sub>3</sub>(SO<sub>4</sub>)<sub>2</sub>(OH)<sub>6</sub>; alunite group. It occurs in pale yellow lumps of tabular grains on the west side of the Kaibab fault, southern Utah.
Industry:Mining
A trigonal mineral, (Te,Bi)<sub>2</sub>; melonite group; steel-gray; in chalcopyrite on the Kola Peninsula, Russia.
Industry:Mining
A trigonal mineral, (Zn,Fe,Mn)Mn<sub>4</sub>O<sub>7</sub>.3H<sub>2</sub>O . Formerly called hydrofranklinite.
Industry:Mining