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United States Bureau of Mines
Industry: 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 variety of opal occurring in boulders between layers of sandstone and soft clay in the form of pipes in thickness from 1 mm to 3 cm.
Industry:Mining
A variety of opal with alumina and lime as impurities.
Industry:Mining
A variety of opal with woody texture by replacement.
Industry:Mining
A variety of opal with woody texture by replacement.
Industry:Mining
A variety of opal with woody texture by replacement.
Industry:Mining
A crystallized variety of dolomite, having a pearly luster.
Industry:Mining
A crystallized variety of dolomite, having a pearly luster.
Industry:Mining
A variety of opaque common opal having a fine red color.
Industry:Mining
A variety of peridotite that consists essentially of olivine and enstatite or bronzite.
Industry:Mining
A variety of phengite, a siliceous variety of muscovite.
Industry:Mining
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