- 行业: Mining
- Number of terms: 33118
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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 variety of quartz, named for the fancied resemblance of the crystal to the successive tiers of the Tower of Babel.
Industry:Mining
A variety of regional metamorphism brought about by the action of heat and solvents at high lithostatic pressures, not at pressures induced by orogenic deformation. Compare: thermal metamorphism
Industry:Mining
A variety of sapropelic coal composed of a mixture of structureless humic sapropel and algal remains. Also spelled tscheremchite.
Industry:Mining
A variety of schist in which paragonite supplants muscovite or biotite.
Industry:Mining
A variety of serpentine used by the Maoris for ornaments. Similar to bowenite.
Industry:Mining