- 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 ...
Monochromatic light from quantized electron transitions in thermally excited ions or atoms. Compare: absorption spectra
Industry:Mining
Monoclinic (beta) and orthorhombic minerals (Ce,Nd,La,Y)NbO<sub>4</sub>, further speciated according to the predominant rare-earth element; dull to vitreous brownish black; in pegmatites associated with euxenite, monazite, gadolinite, and other rare-earth minerals in North Carolina, South Carolina, Virginia, Texas, Norway, Sweden, and Africa.
Industry:Mining
Monoclinic and orthorhombic minerals, (Na,K)<sub>2</sub>Mg(Si,Al)<sub>18</sub>O<sub>36</sub>(OH).9H<sub>2</sub>O , of the zeolite group; transparent to translucent, vitreous to pearly; in spherical aggregates of thin, blade-shaped crystals at Kamloops Lake, BC, Canada and Leavitt Lake, CA.
Industry:Mining
Monoclinic silica, SiO<sub>2</sub>(silica-G), with quartz in chert from dry lake beds; also cavity fillings in rhyolitic ignimbrites. Named for Mogan, Canary Islands.
Industry:Mining
MoO<sub>3</sub>; white at ordinary temperatures; yellow at elevated temperatures; molecular weight, 143.94; orthorhombic; sp gr, 4.69 (at 21 degrees C); melting point, 795 degrees C; boiling point, 1,264 degrees C or sublimes at 1,155 degrees C, at 1 atmophere (101 kPa); sparingly soluble in water; very soluble in excess alkali with the formation of molybdates; and soluble in concentrated mixtures of nitric and hydrochloric acids and in mixtures of nitric and sulfuric acids.
Industry:Mining
More than 150 uranium-bearing minerals are known to exist, but only a few are common. The five primary uranium-ore minerals are pitchblende, uraninite, davidite, coffinite, and brannerite. These were formed by deep-seated hot solutions and are most commonly found in veins or pegmatites. The secondary uranium ore minerals, altered from the primary minerals by weathering or other natural processes, are carnotite, tyuyamunite and metatyuyamunite (both very similar to carnotite), torbemite and metatorbernite, autunite and metaautunite, and uranophane.
Industry:Mining
Mortar applied to a surface with a cement gun in the same manner as gunite. Such mortar has a cube crushing strength of 3,000 psi (20.7 MPa) at 7 days and of 6,000 psi (41.4 MPa) at 28 days, with a water-cement ratio of 0.45.
Industry:Mining
