- المجال: Mining
- Number of terms: 33118
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- 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 black marble found in Roman ruins, probably from the Taenarian peninsula, Greece.
Industry:Mining
A black mixture of samarskite with parallel overgrowths of columbite. Also spelled aanerodite.
Industry:Mining
A black or dark-colored volcanic glass, usually of rhyolite composition, characterized by conchoidal fracture. It is sometimes banded or has microlites. Usage of the term goes back as far as Pliny, who described the rock from Ethiopia. Obsidian has been used for making arrowheads, other sharp implements, jewelry, and art objects.
Industry:Mining
A black or dark-colored volcanic glass, usually of rhyolite composition, characterized by conchoidal fracture. It is sometimes banded or has microlites. Usage of the term goes back as far as Pliny, who described the rock from Ethiopia. Obsidian has been used for making arrowheads, other sharp implements, jewelry, and art objects.
Industry:Mining
A black or gray variety of hematite with splendant metallic luster, often showing iridescence; occurs in micaceous or foliated masses or in tabular or disklike crystals.
Industry:Mining
A black or gray variety of hematite with splendant metallic luster, often showing iridescence; occurs in micaceous or foliated masses or in tabular or disklike crystals.
Industry:Mining
A black or gray variety of hematite with splendant metallic luster, often showing iridescence; occurs in micaceous or foliated masses or in tabular or disklike crystals.
Industry:Mining
A black powder obtained either by the rapid cooling of antimony vapor or by the electrolysis of a solution of antimony chloride in hydrochloric acid, using a platinum cathode and an antimony anode. When scratched, the hard black mass deposited on the cathode will explode. The mass may consist of a solid solution of antimony trichloride in metallic antimony.
Industry:Mining
A black substance, consisting essentially of carbon from the smoke of wood or coal, esp. that which adheres to the inside of the chimney, containing also volatile products condensed from the combustion of the wood or coal, including certain ammonia salts.
Industry:Mining
