- 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 the texture of bostonite, in which microlites of rough irregular feldspar tend to form clusters of divergent laths within a trachytoid groundmass.
Industry:Mining
Said of the texture of dense, holocrystalline igneous rocks consisting of tightly appressed microlites, generally of feldspar, interwoven in irregular, unoriented fashion. Compare: trachytic felted.
Industry:Mining
Said of the texture of some dense, microcrystalline igneous rocks, or of devitrified glass, in which individual constituents are too small to be distinguished with the unaided eye.
Industry:Mining
Said of the texture of the groundmass in certain holocrystalline, porphyritic, igneous rocks in which the feldspar crystals have quadratic or short, stumpy, rectangular cross sections, rather than the lath-shaped outline observed in trachytic texture. Also, said of a groundmass with this texture, or of a rock having an orthophyric groundmass.
Industry:Mining
Said of the texture of the groundmass of a holocrystalline igneous rock in which lathshaped microlites (typically plagioclase) are arranged in a glass-free mesostasis and are generally interwoven in irregular unoriented fashion. Compare: trachytic
Industry:Mining
Said of two or more phases that, at mutual equilibrium, cannot dissolve completely in one another; e.g., oil and water.
Industry:Mining
Said to be a native alloy containing 84.6% gold, 2.9% silver, 0.2% iron, 0.9% copper, and the remainder 11.4% platinum.
Industry:Mining
Said to be a native alloy of gold and iridium carrying 62.1% gold, 30.4% iridium, 3.8% platinum, and 2.1% silver.
Industry:Mining
Salt containing substantial quantities of impurities such as calcium and/or magnesium chloride, which are highly deliquescent and prevent caking.
Industry:Mining
