- 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 ...
Mineralized materials stacked so as to permit wanted minerals to be effectively and selectively dissolved by application of a suitable solute.
Industry:Mining
Minerallike constituent of rocks which is not definite enough in chemical composition or in physical properties to be considered a mineral. Hydrocarbons, volcanic glass, and palagonite are classed as mineraloids.
Industry:Mining
Minerals are conveniently divided into metallic and nonmetallic groups, and then arranged in subdivisions according to the elements which form their main constituents. The nonmetallic minerals (carbon, diamond, coals, bitumen, asphalt, boron, sulfur, rock salt, etc.) lack the properties of the metallic minerals such as a bright metallic luster, hardness, density, and good conduction of heat and electricity.
Industry:Mining
Minerals artificially dyed to improve their color or to imitate a more valuable stone; they usually fade or discolor and may include chalcedony, turquoise, jadeite, opal, serpentine, and alabaster.
Industry:Mining
Minerals deposited as gradually hardening gelatinous or flocculent masses instead of assuming crystalline form; may apply to some deposits of malachite, hematite, and psilomelane. Compare: botryoidal; reniform.
Industry:Mining
Minerals essential to the national defense, for the supply of which, during war, we are wholly or in part dependent on foreign sources, and for which strict measures controlling conservation and distribution are necessary. For example, chromium- and tin-bearing minerals, quartz crystal, and sheet mica were some of the "strategic minerals" during World War II.
Industry:Mining
Minerals in which a specific coloring agent is an essential constituent, e.g., copper in malachite, iron in olivine, manganese in rhodochrosite. Compare: allochromatic
Industry:Mining
Minerals with crystal structure containing SiO<sub>4</sub>tetrahedron arranged as (1) isolated units, (2) single or double chains, (3) sheets, or (4) three-dimensional networks.
Industry:Mining
