- 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 crystallized variety of calcite found in thin lamellae or paperlike plates.
Industry:Mining
A crystalloblastic rock consisting mainly of amphibole and plagioclase with little or no quartz. As the content of quartz increases, the rock grades into hornblende plagioclase gneiss. Compare: feather amphibolite.
Industry:Mining
A crystallographic axis of rotation of 60 degrees , a sixfold axis. Compare: axis of symmetry.
Industry:Mining
A crystallographic axis of rotation of 90 degrees , four-fold. Compare: axis of symmetry.
Industry:Mining
A crystallographic direction of chemical solubility in a crystal, possibly due to exsolution of a second crystalline phase on falling temperature and/or pressure or to unannealed slip during plastic deformation. Solution planes may lead to parting in some mineral specimens.
Industry:Mining