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United States Bureau of Mines
行业: Mining
Number of terms: 33118
Number of blossaries: 0
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 ...
Indirect illumination of stage of microscope, causing objects to be brightly displayed by oblique rays against a dark background.
Industry:Mining
Individual mass of quartz with a halo of alteration and ore minerals, or close assemblage of seams of such quartz and accompanying altered ground.
Industry:Mining
Indurated sapropel.
Industry:Mining
Industrial diamond having a grain in all directions instead of in regular layers. Compare: feinig
Industry:Mining
Industrial diamond used for wire-drawing dies, indentor points, shaped-diamond tools, glaziers, and dressers. Toolstones approach gem diamonds in perfection, although not in color. The finer grades may be identical with diamonds sold as low-grade gems. The lower grade toolstones are also sometimes used as drill diamonds. Compare: drill diamond
Industry:Mining
Industrial diamonds as purchased from a diamond supplier in bulk. Compare: loose stone
Industry:Mining
Inferior barite; Derbyshire lead mines, U.K.
Industry:Mining
Inferior opal that does not exhibit play of color; found in association with precious opal (Australia).
Industry:Mining
Inferior ores arranged ready for crushing.
Industry:Mining
Inferred reserves. See: reserves
Industry:Mining
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