- المجال: 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, 1(Ca<sub>2</sub>(Al<sub>4</sub>Si<sub>8</sub>O<sub>24</sub>).13H<sub>2</sub>O) ; zeolite group; pseudocubic cleavage; occurs in cavities in basalts and hydrothermal veins and as alteration of silicic vitreous tuffs in alkaline saline lake deposits.
Industry:Mining
A trigonal mineral, 3(HgS) ; trimorphous with hypercinnabar and metacinnabar; forms brilliant red acicular crystals and red to brownish-red or gray masses; soft; sp gr, 8.1; occurs in impregnations and vein fillings near recent volcanic rocks and hot springs, alluvial deposits; the chief source of mercury.
Industry:Mining
A trigonal mineral, 3(HgS) ; trimorphous with hypercinnabar and metacinnabar; forms brilliant red acicular crystals and red to brownish-red or gray masses; soft; sp gr, 8.1; occurs in impregnations and vein fillings near recent volcanic rocks and hot springs, alluvial deposits; the chief source of mercury.
Industry:Mining
A trigonal mineral, 3(NaMg<sub>3</sub>Al<sub>6</sub>(OH,F)<sub>4</sub>(BO<sub>3</sub>)<sub>3</sub>Si<sub>6</sub>O<sub>18</sub>) ; tourmaline group; forms series with schorl and with elbaite; in triangular or hexagonal prisms; pyroelectric and piezoelectric; in metamorphic and metasomatic lime-rich rocks; slices are used to measure transient blast pressures.
Industry:Mining
A trigonal mineral, 6((Ce,La,Nd)<sub>2</sub>CaCO<sub>3</sub>)<sub>3</sub>F<sub>2</sub>) ; vitreous to resinous; forms acute hexagonal bipyramids; in veins, such as the emerald deposits of Columbia; also in alkalic pegmatites. Named for J.J. Paris.
Industry:Mining
A trigonal mineral, Ag<sub>3</sub>AsS<sub>3</sub>; dimorphous with xanthoconite; rhombohedral cleavage; soft; ruby red; occurs in low-temperature or secondary-enrichment veins; a minor source of silver.
Industry:Mining
A trigonal mineral, Ag<sub>3</sub>AsS<sub>3</sub>; dimorphous with xanthoconite; rhombohedral cleavage; soft; ruby red; occurs in low-temperature or secondary-enrichment veins; a minor source of silver.
Industry:Mining
A trigonal mineral, Ag<sub>3</sub>AsS<sub>3</sub>; dimorphous with xanthoconite; rhombohedral cleavage; soft; ruby red; occurs in low-temperature or secondary-enrichment veins; a minor 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, 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
