- 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 group of nonsilicate minerals that are isostructural with garnet, including the oxide yafsoanite, the arsenates berzeliite and manganberzeliite, and the halide cryolithionite. Compare: hydrogrossular; hydrogarnet.
Industry:Mining
A group of plutonic rocks containing alkali feldspar (usually orthoclase, microcline, or perthite), a small amount of plagioclase (less than in "monzonite"), one or more mafic minerals (esp. hornblende), and quartz, if present, only as an accessory; also, any rock in that group; the intrusive equivalent of "trachyte." With an increase in the quartz content, syenite grades into "granite." Its name is derived from Syene, Egypt. A.G. Werner in 1788 applied the name in its present meaning; the Egyptian rock is a granite containing much quartz.
Industry:Mining
A group of plutonic rocks having the composition of diorite but with an appreciable amount of quartz, i.e., between 5% and 20% of the light-colored constituents; also, any rock in that group; the approximate intrusive equivalent of dacite.
Industry:Mining
A group of plutonic rocks intermediate in composition between acidic and basic, characteristically composed of dark-colored amphibole (esp. hornblende), acid plagioclase (oligoclase, andesine), pyroxene, and sometimes a small amount of quartz; also, any rock in that group; the approximate intrusive equivalent of andesite. Diorite grades into monzonite with an increase in the alkali feldspar content. Etymol: Greek diorizein, to distinguish, in reference to the fact that the characteristic mineral, hornblende, is usually identifiable megascopically. Compare: dolerite; gabbro.
Industry:Mining
A group of productive coal measures occurring in the Pennsylvanian of the Appalachian Region and completely developed in Virginia. Sometimes known as the Upper Pottsville series.
Industry:Mining
A group of related natural features, objects, or forces; e.g., a drainage system or a mountain system.
Industry:Mining
A group of special ceramic materials. Typical properties are great hardness and mechanical strength, high melting point, low electrical resistivity, and high thermal 373 conductivity; impact resistance is low, but thermal-shock resistance is generally good.
Industry:Mining
A group of welding processes in which the parts to be joined are heated to a plastic condition in a forge or other furnace and are welded together by applying pressure or blows.
Industry:Mining
A group of welding processes wherein coalescence is produced by heating with an electric arc or arcs, with or without the application of pressure and with or without the use of filler metal.
Industry:Mining
