- 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 ...
The group of aluminous glauconites grading into normal (ferruginous) glauconite and occurring in sedimentary rocks. Includes skolite and bravaisite. Distinct from pholidolite of Nordenskiold. Compare: illite.
Industry:Mining
The group of calcium garnets uvarovite, grossular, andradite, goldmanite, hibschite, kimzeyite, and schorlomite
Industry:Mining
The group of physical and chemical processes by which earth or rock material is loosened or dissolved and removed from any part of the Earth's surface. It includes the processes of weathering, solution, corrosion, and transportation. The mechanical wear and transportation are effected by rain, running water, waves, moving ice, or winds, which use rock fragments to pound or to grind other rocks to powder or sand.
Industry:Mining
The grouping of coals according to certain qualities or properties, such as coal type, rank, carbon-hydrogen ratio, and volatile matter.
Industry:Mining
The growth of a crystal, as from solution on the walls of a geode, in open pore space, or in a magma chamber; crystal growth.
Industry:Mining
The growth of a metastable or monotropic phase under conditions apparently indicating true equilibrium, as in the development of andalusite crystals in which sillimanite actually represents the stable phase.
Industry:Mining
The hard, bluish-gray, Ordovician bedded phosphates of central Tennessee.
Industry:Mining
