- 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 great soil group in the 1938 classification system; an intrazonal, hydromorphic group of soils having a leached surface layer above a definite clay pan or hardpan. These soils develop on nearly flat upland surfaces under grass or trees in a humid to subhumid climate.
Industry:Mining
A green chromium variety of common opal from Australia, Hungary, and Brazil. Also spelled prase opal.
Industry:Mining
A green crystallized chlorite from the Penninic Alps. Composition essentially the same as that of clinochlore, (Mg,Fe<sub>2+</sub>)<sub>5</sub>Al(Si<sub>3</sub>Al)O<sub>10</sub>(OH)<sub>8</sub>.
Industry:Mining
A green hydrated and oxidized patina on rock outcrops indicating the existence of primary nickel minerals; specif. annabergite (a nickel arsenate). The term is also applied to zaratite (a nickel carbonate) and to morenosite (a nickel sulfate).
Industry:Mining
A green to pale-yellow sodium calcium silicate containing beryllium. One of the sources of beryllium.
Industry:Mining