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United States Bureau of Mines
行业: 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 ...
Dark gray; GaAs; isometric; melting point, 1,240 degrees C. Used in microwave diodes and in high-temperature rectifiers and transistors.
Industry:Mining
Dark lines in the solar spectrum resulting from absorption of light by chemical elements in the chromosphere.
Industry:Mining
Dark ruby silver is pyrargyrite, and light ruby silver is proustite.
Industry:Mining
Dark-blue corundum from Yogo Gulch, MT.
Industry:Mining
Dark-colored gem variety of tourmaline.
Industry:Mining
Dark-colored, organic, well-decomposed soil material consisting of the residues of plant and animal materials together with synthesized cell substances of soil organisms and various inorganic elements.
Industry:Mining
Dark-red to brownish-red pyrope garnet from Tanzania, the clear blood-red specimens used as gems.
Industry:Mining
Dealing in ores, concentrates, and metals in transit from source to market.
Industry:Mining
Deals with the amount, and not the nature, of a substance. In the case of a coal seam, quantity refers to its workable thickness and acreage. In the case of ore, the quantity determines its commercial importance. Unit ore values without the quantity factor have only a qualitative significance.
Industry:Mining
Decidedly elongated and flattened; descriptive of some minerals.
Industry:Mining
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