- Industry: Mining
- Number of terms: 33118
- Number of blossaries: 0
- 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 ...
An isometric mineral, 4(NaCl) ; cubic cleavage; soft; salty tasting; forms disseminated grains or crystals in sedimentary rocks, or aggregates of large cubic crystals; granular to massive, the latter as extensive sedimentary beds ranging in thickness from less than 1 mm to more than 50 m, also in convoluted masses called salt domes; a typical constituent of playa lake deposits in arid regions.
Industry:Mining
An isometric mineral, 4(NaCl) ; cubic cleavage; soft; salty tasting; forms disseminated grains or crystals in sedimentary rocks, or aggregates of large cubic crystals; granular to massive, the latter as extensive sedimentary beds ranging in thickness from less than 1 mm to more than 50 m, also in convoluted masses called salt domes; a typical constituent of playa lake deposits in arid regions.
Industry:Mining
An isometric mineral, 4(PbS) ; cubic cleavage; forms cubes and octahedra, also coarseor fine-grained masses; sp gr, 7.6; occurs with sphalerite in hydrothermal veins, also in sedimentary rocks as replacement deposits; an important source of lead and silver. Also spelled galenite.
Industry:Mining
An isometric mineral, 4(PbS) ; cubic cleavage; forms cubes and octahedra, also coarseor fine-grained masses; sp gr, 7.6; occurs with sphalerite in hydrothermal veins, also in sedimentary rocks as replacement deposits; an important source of lead and silver. Also spelled galenite.
Industry:Mining
An isometric mineral, 4(PbS) ; cubic cleavage; forms cubes and octahedra, also coarseor fine-grained masses; sp gr, 7.6; occurs with sphalerite in hydrothermal veins, also in sedimentary rocks as replacement deposits; an important source of lead and silver. Also spelled galenite.
Industry:Mining
An isometric mineral, 8(Ca<sub>3</sub>Al<sub>2</sub>Si<sub>3</sub>O<sub>12</sub>) , rarely pure; garnet group; crystallizes in dodecahedra and trapezohedra; varicolored; in metamorphosed calcareous rocks and skarns. Formerly called grossularite.
Industry:Mining
An isometric mineral, 8(Ca<sub>3</sub>Fe<sub>2</sub>Si<sub>3</sub>O<sub>12</sub>) ; never pure; garnet group; in yellow, green, red, brown, or black dodecahedral and trapezohedral crystals, or may be massive; in calcareous metasediments and placers. Varieties include topazolite, demantoid, melanite, aplome, and bredbergite.
Industry:Mining
An isometric mineral, 8(Fe<sub>2+</sub>Al<sub>2</sub>O<sub>4</sub>) ; spinel group; forms series with magnesian spinel, with gahnite, and with chromite; massive or fine grained; Mohs hardness, 7.5 to 8; in metamorphosed argillaceous sediments with andalusite, sillimanite, or garnet; also in contact metamorphic deposits in limestone or marble; in some eruptive mafic rocks; may occur with corundum to form emery.
Industry:Mining
An isometric mineral, 8(Fe<sub>2+</sub>Al<sub>2</sub>O<sub>4</sub>) ; spinel group; forms series with magnesian spinel, with gahnite, and with chromite; massive or fine grained; Mohs hardness, 7.5 to 8; in metamorphosed argillaceous sediments with andalusite, sillimanite, or garnet; also in contact metamorphic deposits in limestone or marble; in some eruptive mafic rocks; may occur with corundum to form emery.
Industry:Mining
