- المجال: 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 schist in which the main constituent, chlorite, imparts a schistosity by parallel arrangement of its flakes. Quartz, epidote, magnetite, and garnet may be accessories, the last two often as conspicuous porphyroblasts.
Industry:Mining
A schist whose essential constituents are mica and quartz, and whose schistosity is mainly due to the parallel arrangement of mica flakes.
Industry:Mining
A schist with elongated ferromagnesian minerals lying in a plane but otherwise unoriented.
Industry:Mining
A schistose metamorphic rock consisting principally of hornblende, with little or no quartz. Unlike amphibolite, it does not need to contain plagioclase.
Industry:Mining
A schistose metamorphic rock derived from a rock high in content of magnesium; e.g., serpentine.
Industry:Mining
A schistose metamorphic rock whose green color is due to the presence of chlorite, epidote, or actinolite. Compare: greenstone
Industry:Mining
A schistosity due to the parallel alignment of columnar or acicular crystals in rocks.
Industry:Mining