- المجال: 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 variety of black bort from South Africa showing minute brilliant points possibly due to included diamonds. Compare: bort
Industry:Mining
A variety of calcite that contains manganese carbonate and is closely related to rhodochrosite.
Industry:Mining
A variety of calcite that contains manganese carbonate and is closely related to rhodochrosite.
Industry:Mining
A variety of calcite that emits an offensive odor when dissolved in dilute hydrochloric acid. The odor is due to trace sulfides and other impurities. See: swinestone
Industry:Mining