- 行业: Mining
- Number of terms: 33118
- Number of blossaries: 0
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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 ...
Said of the texture of a porphyritic igneous rock in which the groundmass, composed of a glassy or partly crystalline material other than augite, occupies the interstices between unoriented feldspar laths, the groundmass forming a relatively small proportion of the rock. Compare: hyalophitic; hyalocrystalline.
Industry:Mining
Said of the texture of a rock (e.g., a cellular dolomite) characterized by openings or cavities, which may or may not be connected. Although there are no specific size limitations, the term is usually applied to cavities larger than pores and smaller than caverns. The syn. vesicular is preferred when describing igneous rocks. Compare: porous; cavernous; vesicular.
Industry:Mining
Said of the texture of a rock intermediate between microcrystalline and macrocrystalline; also, said of a rock with such a texture.
Industry:Mining
Said of the texture of a rock, esp. a basic igneous rock, composed of pea-size spherical bodies (varioles) in a finer-grained groundmass. Compare: spherulitic
Industry:Mining
Said of the texture of a rock, esp. a lava, characterized by abundant vesicles formed as a result of the expansion of gases during the fluid stage of the lava. Compare: cellular; scoriaceous.
Industry:Mining
Said of the texture of an igneous rock composed entirely of crystals, i.e., having no glassy part. Also, said of a rock with such a texture.
Industry:Mining
Said of the texture of an igneous rock in which the feldspar crystals are approx. the same size as the pyroxene and are only partially included by them. The term ophitic generally includes such textures.
Industry:Mining
Said of the texture of an igneous rock in which the mesostasis is glassy and makes up a proportion of the rock intermediate in texture between hyalophilitic and hyalocrystalline. Compare: intersertal
Industry:Mining
Said of the texture of an igneous rock that has crystalline components in a glassy groundmass, with a ratio of crystals to glass between 3:5 and 1:7. Compare: hypocrystalline
Industry:Mining
Said of the texture of an igneous rock, typically porphyritic, in which the sizes of the grains vary gradually or in a continuous series. Compare: hiatal
Industry:Mining
