- 行业: Mining
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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 name for the fluorite-rich micas, natural or artificial. See: fluor.
Industry:Mining
A group name for the orthopyroxenes of the MgSiO<sub>3</sub>-FeSiO<sub>3</sub>isomorphous series. It includes enstatite, hypersthene, and orthoferrosilite. Compare: clinoenstenite.
Industry:Mining
A group name for the series of hydrogarnets encompassing the series hibschite, katoite, and grossular. Water content ranges from about 1.5% in hibschite to 13% in katoite; grossular is anhydrous.
Industry:Mining
A group name for the series of hydrogarnets encompassing the series hibschite, katoite, and grossular. Water content ranges from about 1.5% in hibschite to 13% in katoite; grossular is anhydrous.
Industry:Mining
A group of altered extrusive and minor intrusive basaltic rocks that characteristically have a high albite content. The group is named for its type member, spilite.
Industry:Mining
A group of animals characteristic of a given stratigraphic facies or adapted to life in a restricted environment; e.g., the black-shale fauna of the Middle and Upper Devonian of the Appalachian region of the United States.
Industry:Mining
A group of basaltic and associated igneous rocks intermediate in composition between rocks of the Atlantic suite and the Pacific suite. Compare: Atlantic suite; Pacific suite.
Industry:Mining
A group of closely spaced, distinct parallel fractures filled with mineral matter and separated by layers of barren rock.
Industry:Mining
A group of coarse-grained plutonic rocks intermediate in composition between quartz diorite and quartz monzonite (U.S. usage), containing quartz, plagioclase (oligoclase or andesine), and potassium feldspar, with biotite, hornblende, or, more rarely, pyroxene, as the mafic components; also, any member of that group; the approximate intrusive equivalent of rhyodacite. The ratio of plagioclase to total feldspar is at least 2:1 but less than 9:10. With less alkali feldspar it grades into quartz diorite, and with more alkali feldspar, into granite or quartz monzonite.
Industry:Mining
A group of copper-nickel alloys containing 45% to 60% copper with minor amounts of iron and manganese, and characterized by relatively constant electrical resistivity irrespective of temperature; used in resistors and thermocouples.
Industry:Mining
