- 行业: Mining
- Number of terms: 33118
- Number of blossaries: 0
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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 ...
An isolated exposure of the overridden rock in a region of thrust faulting. It is surrounded by rocks of the overriding block and is thus separated from other surface exposures of rock like itself.
Industry:Mining
An isolated rock unit that is an erosional remnant or outlier of a nappe. The original sense of the term was merely descriptive; i.e., included any isolated rock mass, such as an erosional remnant. Plural, klippen.
Industry:Mining
An isolated, nearly level landmass standing distinctly above the surrounding country, bounded by abrupt or steeply sloping erosion scarps, and capped by a layer of resistant, nearly horizontal rock (often lava). Compare: plateau
Industry:Mining
An isolated, residual or erosional mass of rock supported by or balanced on a pedestal. The term is also applied to the entire feature.
Industry:Mining
An isometric and tetragonal mineral, Mn<sub>5</sub>As<sub>3</sub>O<sub>9</sub>(OH,Cl) ; green; forms crusts at Laangban, Sweden, and green to brown selvages at Sterling Hill, NJ.
Industry:Mining
An isometric closed crystal form of 12 faces, each an irregular pentagon. It is named after pyrite, which characteristically has this crystal form. Compare: dodecahedron
Industry:Mining
An isometric crystal form (hk0) of 24 faces, each an isosceles triangle, so arranged that four faces appear to replace each face of a cube (hexahedron).
Industry:Mining
An isometric crystal form of four faces, each an equilateral triangle; the alternate faces of an octahedron. Adj: tetrahedral.
Industry:Mining
