- 行业: Mining
- Number of terms: 33118
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- 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 ...
A trigonal mineral, Ag<sub>3</sub>SbS<sub>3</sub>; dimorphous with pyrostilpnite; rhombohedral cleavage; soft; deep red; in late-primary or secondary-enrichment veins, and an important source of silver.
Industry:Mining
A trigonal mineral, Ag<sub>3</sub>SbS<sub>3</sub>; dimorphous with pyrostilpnite; rhombohedral cleavage; soft; deep red; in late-primary or secondary-enrichment veins, and an important source of silver.
Industry:Mining
A trigonal mineral, AgAsS<sub>2</sub>; forms minute scarlet-vermillion rhombohedral crystals; at Binenthal, Switzerland.
Industry:Mining
A trigonal mineral, AgFe<sub>3</sub>(SO<sub>4</sub>)<sub>2</sub>(OH)<sub>6</sub>; alunite group; yellow to brown-yellow.
Industry:Mining
A trigonal mineral, Al<sub>2</sub>O<sub>3</sub>; hematite group; forms hexagonal prisms with basal and rhombohedral parting; red (ruby), blue (sapphire), green (oriental emerald), reddishbrown, white, or gray; defines 9 on the Mohs hardness scale; in nepheline syenite pegmatites and placer deposits. Emery is granular corundum mixed with magnetite and spinel. Synthetic corundum made from bauxite together with other manufactured abrasives have largely replaced natural materials.
Industry:Mining
A trigonal mineral, Al<sub>4</sub>(Ta,Nb)<sub>3</sub>(O,OH,F)<sub>14</sub>; yellow-brown.
Industry:Mining
A trigonal mineral, AlCl<sub>3</sub>.6H<sub>2</sub>O ; occurs in acid fumaroles on Mt. Vesuvius, Italy.
Industry:Mining
A trigonal mineral, Ba(Y,Ce)<sub>6</sub>Si<sub>3</sub>B<sub>6</sub>O<sub>24</sub>F <sub>2</sub>: weakly radioactive; occurs in veins in syenite associated with wohlerite, rosenbuschite, catapleiite, orangite, lavenite, elaeolite, and sodalite.
Industry:Mining
A trigonal mineral, BaCe(CO<sub>3</sub>)<sub>2</sub>F ; as yellow platy masses in hydrothermal deposits near the Huang-Ho River, China. Also spelled huangeite-(Ce).
Industry:Mining
A trigonal mineral, BaFe<sub>3</sub>(AsO<sub>4</sub>)<sub>2</sub>(OH)<sub>5</sub>; crandallite group; forms green to yellowgreen rosettes or crusts.
Industry:Mining
