- 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 a hydrothermal mineral deposit formed at temperature and depth conditions intermediate between mesothermal and epithermal; also, said of that environment. Compare: hypothermal deposit; xenothermal; telethermal.
Industry:Mining
Said of a hydrothermal mineral deposit formed within about 1 km of the Earth's surface and in the temperature range of 50 to 200 degrees C, occurring mainly as veins. Also, said of that depositional environment. Compare: hypothermal deposit; mesothermal; leptothermal; telethermal; xenothermal.
Industry:Mining
Said of a hydrothermal mineral deposit located far from its magmatic source. Compare: apomagmatic; cryptomagmatic.
Industry:Mining
Said of a hydrothermal mineral deposit without demonstrable relationship to igneous processes. The term is little used. Compare: apomagmatic; telemagmatic.
Industry:Mining
Said of a liquid (usually water) mixed with finely ground earthy or clayey materials.
Industry:Mining
Said of a major vein dividing or fraying into smaller fissures; also, said of an ore comprising a series of such veins.
Industry:Mining
Said of a material that is impervious to visible light or has metallic luster. Compare: transopaque; translucent; transparency; transparent; opacity
Industry:Mining
Said of a material that resembles stone in its hardness; e.g., petrous phosphates. Little used.
Industry:Mining
Said of a medium with properties the same in all directions; in crystal optics, said of a crystal with refractive index that does not vary with crystallographic direction. Isometric crystals and amorphous substances, such as glass, are generally isotropic. Noun, isotropy. Compare: uniaxial; anisotropic.
Industry:Mining
Said of a mineral crystal or fragment that will not melt in the hottest flame produced by a hand-held blowpipe or blowtorch, i.e., around 1,500 degrees C. The bronzite variety of pyroxene, e.g., has a melt point of approx. 1,400 degrees C and is said to be practically infusible; quartz, with a melt point of about 1,710 degrees C, is infusible.
Industry:Mining
