- Industri: 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 silicate of ferric iron, calcium, etc., approaching garnet in composition, but with optical properties similar to those of an orthorhombic pyroxene. Formed by the action of basic slag on silica brick in a steel furnace.
Industry:Mining
A sill composed of two or more intrusions having different chemical and mineralogical compositions.
Industry:Mining
A sill made up of two or more intrusions composed of the same kind of igneous rock.
Industry:Mining
A silver alloy containing at least 92.5% silver, the remainder being unspecified but usually copper.
Industry:Mining
A silver arsenide occurring with native silver at Silver Islet, Lake Superior, MI.
Industry:Mining
A silver ore consisting of a mixture of sulfides, arsenides, and antimonides, with striking intergrowths and in granular masses; contains nickel and lead. Compare: macfarlanite
Industry:Mining