- 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 ...
Said of an igneous rock having one or more normative, dark-colored iron-, magnesium-, or calcium-rich minerals as the major components of the norm; also, said of such minerals. Etymol. a mnemonic term derived from ferric + magnesium + ic. Compare: basic; salic; mafic; felsic.
Industry:Mining
Said of an igneous rock or magma that contains calcium, iron, and magnesium. Etymol: a mnemonic term derived from calcium + ferric (or ferrous) + magnesium + ic.
Industry:Mining
Said of an isothermal reversible reaction in a crystallizing melt or magma in which a liquid phase reacts with a solid phase to produce another solid phase on cooling.
Industry:Mining
Said of an orebody that is only partly developed, and the values of which can be only approx. determined.
Industry:Mining
Said of certain light-colored silicon- or aluminum-rich minerals present in the norm of igneous rocks; e.g., quartz, feldspar, felspathoid. Also, applied to rocks having one or more of these minerals as major components of the norm. Etymol: a mnemonic term derived from "s"ilicon + "al"uminum + "ic." Compare: femic; mafic; felsic.
Industry:Mining
Said of coal when it makes a rustling sound as it bursts, cracks, and breaks off while under pressure. The rising of methane from the coal causes a similar sound. Compare: dead
Industry:Mining
Said of components derived from an older sedimentary formation and incorporated in a younger one.
Industry:Mining
