- 行业: 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 crystal with edges grown beyond face centers. Compare: skeletal crystal.
Industry:Mining
A crystal, usually grown artificially, in which all parts have the same crystallographic orientation.
Industry:Mining
A crystalline deposit of metallic lead on zinc that has been placed in a solution of acetate of lead.
Industry:Mining
A crystalline limestone that will take a polish; e.g., the Holston orthomarble of Tennessee. Compare: metamarble; metalimestone; ortholimestone.
Industry:Mining
A crystalline rock composed predominantly of one or more of the following minerals: calcite, dolomite, or serpentine, and capable of being polished.
Industry:Mining
A crystalline rock in which minerals characteristic of a lower metamorphic grade have developed by retrograde metamorphism at the expense of minerals peculiar to a higher metamorphic grade.
Industry:Mining
A crystalline variety of limestone containing not less than 5% nor more than 40% of magnesium carbonate as the dolomite constituent.
Industry:Mining
A crystalline variety of limestone containing not more than 5% of magnesium carbonate.
Industry:Mining
A crystalline variety of limestone, containing in excess of 40% of magnesium carbonate as the dolomite constituent.
Industry:Mining
