- 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 porous or permeable membrane separating anode and cathode compartments of an electrolytic cell from each other or from an intermediate compartment.
Industry:Mining
A porous rock, such as a sandstone or limestone, that is impregnated naturally with asphalt.
Industry:Mining
A porous rock, such as a sandstone or limestone, that is impregnated naturally with asphalt.
Industry:Mining
A porous rock, such as a sandstone or limestone, that is impregnated naturally with asphalt.
Industry:Mining
A porphyritic extrusive rock composed chiefly of leucite, nepheline, and clinopyroxene. Compare: haueynophyre
Industry:Mining
A porphyritic extrusive rock having phenocrysts of plagioclase and potassium feldspar in nearly equal amounts, little or no quartz, and a finely crystalline to glassy groundmass, which may contain obscure potassium feldspar; the extrusive equivalent of monzonite. Latite grades into trachyte with an increase in the alkali feldspar content, and into andesite or basalt, depending on the presence of sodic or calcic plagioclase, as the alkali feldspar content decreases. It is usually considered synonymous with trachyandesite and trachybasalt, depending on the color. The name, given by Ransome in 1898, is derived from Latium, Italy.
Industry:Mining
A porphyritic extrusive rock with phenocrysts of plagioclase and quartz in a groundmass of orthoclase and quartz.
Industry:Mining
A porphyritic extrusive rock with phenocrysts of plagioclase and quartz in a groundmass of orthoclase and quartz.
Industry:Mining
A porphyritic extrusive rock with phenocrysts of plagioclase and quartz in a groundmass of orthoclase and quartz.
Industry:Mining
