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United States Bureau of Mines
Sektör: Mining
Number of terms: 33118
Number of blossaries: 0
Company Profile:
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 fine-grained igneous rock of basic composition containing varioles. Not recommended usage.
Industry:Mining
A fine-grained metamorphic rock containing a high percentage of calc-silicate minerals.
Industry:Mining
A fine-grained metamorphic rock derived from a high-magnesium igneous rock; e.g., serpentine.
Industry:Mining
A fine-grained oolite resembling the roe of a fish. See: oolite.
Industry:Mining
A fine-grained or porphyritic extrusive or hypabyssal igneous rock chiefly composed of pyroxene (esp. titanaugite) and leucite, with little or no feldspar and without olivine.
Industry:Mining
A fine-grained or porphyritic extrusive or hypabyssal rock, of basaltic character, but primarily composed of nepheline and clinopyroxene, esp. titanaugite, and lacking olivine and feldspar.
Industry:Mining
A fine-grained pelagic deposit with more than 30% calcium carbonate of organic origin, of which pteropods are an important constituent.
Industry:Mining
A fine-grained rock composed of a mosaic of equidimensional grains without preferred orientation and typically formed by contact metamorphism. Porphyroblasts or relict phenocrysts may be present in the granoblastic matrix.
Industry:Mining
A fine-grained saccharoidal marble used by sculptors. The best qualities are pure white and free from markings.
Industry:Mining
A fine-grained sandstone used extensively in the manufacture of very cheap sharpening stones, esp. axstones. Found in Indiana.
Industry:Mining