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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 ...
A pseudochromatic optical effect resulting in flashes of colored light from certain minerals, such as fire opal and labradorite, as they are turned in white light. Periodic spacings of phases with slightly differing refractive indices act as optical diffraction gratings in these minerals. Compare: fire; opalescence; pseudochromatism.
Industry:Mining
A pseudochromatic optical effect resulting in flashes of colored light from certain minerals, such as fire opal and labradorite, as they are turned in white light. Periodic spacings of phases with slightly differing refractive indices act as optical diffraction gratings in these minerals. Compare: fire; opalescence; pseudochromatism.
Industry:Mining
A pseudomorph of spodumene in which the spodumene has been replaced by muscovite either as pinite or as visible plates.
Industry:Mining
A pseudomorph of spodumene in which the spodumene has been replaced by muscovite either as pinite or as visible plates.
Industry:Mining
A pseudomorph with the same composition as the original crystal, caused by a phase transformation; e.g., calcite with aragonite morphology. Compare: pseudomorph
Industry:Mining
A pseudomorph, FeWO<sub>4</sub>; after scheelite(?).
Industry:Mining
A pseudoporphyritic crystal in a rock produced by metamorphic recrystallization. Adj: porphyroblastic.
Industry:Mining
A pseudoporphyritic crystal in a rock produced by metamorphic recrystallization. Adj: porphyroblastic.
Industry:Mining
A pseudoporphyritic crystal in a rock produced by metamorphic recrystallization. Adj: porphyroblastic.
Industry:Mining
A pseudotrigonal variety of clinochlore.
Industry:Mining
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