- المجال: 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 ...
A mineral aggregate shaped like a cluster of grapes. Also, full of small kernels like a grape.
Industry:Mining
A mineral aggregate shaped like a cluster of grapes. Also, full of small kernels like a grape.
Industry:Mining
A mineral aggregate shaped like a cluster of grapes. Also, full of small kernels like a grape.
Industry:Mining
A mineral characterized by trivalent antimony and oxygen; e.g., trigonite, Pb<sub>3</sub>Mn(AsO<sub>3</sub>)<sub>2</sub>(AsO<sub>2</sub>(OH).
Industry:Mining
A mineral closely related to chlorite in composition and found in the groundmass of tholeiitic basalts where it occupies interstices between feldspar laths, forms pseudomorphs after olivine, or occurs in veinlets and amygdules. The fresh mineral is pale green, but when weathered, it may be dark green, brown, or red.
Industry:Mining
A mineral component of a rock that is necessary to the classification and nomenclature of the rock, but that is not necessarily present in large amounts. Compare: accessory mineral
Industry:Mining
A mineral constituent of a metamorphic rock formed by recrystallization and bounded by its own crystal faces. It is a type of crystalloblast. The term was originated by Becke in 1903. Compare: xenoblast
Industry:Mining
A mineral containing the radical (WO<sub>4</sub>)<sub>2-</sub>, in which the hexavalent tungsten ion and its four oxygens form a flattened square rather than a tetrahedron, e.g., the wolframite series, (Fe,Mn)WO<sub>4</sub>. Tungsten and molybdenite may substitute for each other.
Industry:Mining
A mineral deposit between two unlike rocks. The term is usually applied to an orebody at the contact between a sedimentary rock and an igneous rock.
Industry:Mining
A mineral deposit consisting of a three-dimensional network of planar to irregular veinlets closely enough spaced that the whole mass can be mined. Compare: reticulate
Industry:Mining
