- 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 term proposed by Zirkel for a variety of elongated spherulite in which there is an aggregation of minute acicular crystals arranged at right angles to a central axis rather than from a point.
Industry:Mining
A term proposed in place of gasoline for that product distilled from oil shale.
Industry:Mining
A term referring to two different materials found in the Ione Valley of northern California: (1) a clay mineral, possibly a variety of kaolinite, found as scales in the Ione sandstone formation, and (2) an impure fossil hydrocarbon found in lignite, which is brownish-yellow, dissolved by chloroform, and yields a brown, tarry oil on destructive distillation.
Industry:Mining
A term related to the condition of a ceramic product which has been heated to a temperature in excess of that required to produce proper vitrification.
Industry:Mining
A term specif. intended to differentiate between the arcs that are commonly observed and the low-pressure skittering arcs.
Industry:Mining
A term suggested for minerals such as chlorite, chloritoid, talc, albite, epidote, amphiboles, and kyanite, whose formation in metamorphosed rocks is favored by shearing stress. Compare: antistress mineral
Industry:Mining
A term suggested for minerals such as cordierite, the feldspars, the pyroxenes, forsterite, and andalusite, whose formation in metamorphosed rocks is believed to be favored by conditions that are not controlled by shearing stress, but by thermal action and by hydrostatic pressure that is probably no more than moderate. Compare: stress mineral
Industry:Mining
A term suggested for that part of the zone of saturation having a means of horizontal escape.
Industry:Mining
A term that compares the resistance of air of a mine to the resistance of a circular opening in a thin plate through which the same quantity of air flows under the same pressure as in the mine.
Industry:Mining
