- 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 ...
Said of the rock of a minor intrusion that consists of a differentiate, i.e., its composition is not the same as that of the parent magma. Compare: aschisite; aschistic.
Industry:Mining
Said of the rock of a minor intrusion that has a composition equivalent to that of the parent magma, i.e., in which there has been no significant differentiation. Compare: diaschistic
Industry:Mining
Said of the rounded, finely banded kidneylike mineral texture formed by ultra-finegrained rhythmic precipitation once thought to denote deposition of colloids. Compare: botryoidal; reniform.
Industry:Mining
Said of the spherulitic texture of an igneous rock that is distinguishable only with the aid of a microscope, owing to the small size of the spherules. Also, said of a rock having such texture.
Industry:Mining
Said of the texture of a diabase porphyry having phenocrysts of plagioclase and augite in a ground mass of plagioclase laths and augite.
Industry:Mining
Said of the texture of a fine-grained or aphanitic igneous rock that lacks phenocrysts. Also, said of a rock exhibiting such texture.
Industry:Mining
Said of the texture of a mineral, esp. a mica, in which small plates break or flake off from the surface like scales.
Industry:Mining
Said of the texture of a porphyritic igneous rock in which the groundmass is composed of an aggregate of differently oriented or parallel microlites in a glassy or cryptocrystalline mesostasis.
Industry:Mining
