- Industria: 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 hornblende-biotite granite containing large rounded crystals of orthoclase mantled with oligoclase. The name has come to be used most frequently as a textural term where it implies plagioclase rims around orthoclase in plutonic rocks.
Industry:Mining
A hornfels formed by contact metamorphism, and consisting of micas, quartz, and feldspar. Compare: leptynolite Cornwall, England.
Industry:Mining
A hot-water solution originating within the Earth and carrying dissolved mineral substances.
Industry:Mining
A hue, as distinguished from white, black, or any tone of gray. Opposite of achromatic color.
Industry:Mining
A hydrated ferric phosphate and sulfate mineral, brown or yellowish in color.
Industry:Mining