- المجال: Mining
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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 formed by the combination of the radical (CO<sub>3</sub>)<sub>2-</sub>with cations; e.g., calcite, CaCO<sub>3</sub>.
Industry:Mining
A mineral formed by the union of an element with oxygen; e.g., corundum, hematite, magnetite, and cassiterite.
Industry:Mining
A mineral formed during the crystallization of a magma as a consequence of an earlier phase failing to react with the liquid. Thus the failure of earlier formed olivine to react with the liquid portion of a magma to form pyroxene may result in the enrichment of the liquid in silica, which finally crystallizes as quartz, the released mineral.
Industry:Mining
A mineral formed during the late stages of magmatic activity, between the main stage of crystallization and the pegmatitic stage.
Industry:Mining
A mineral formed later than the rock enclosing it, usually at the expense of an earlierformed primary mineral, as a result of weathering, metamorphism, or exsolution.
Industry:Mining
A mineral found in nature, as distinguished from rocks, which, in the scientific sense, are mixtures of minerals. Calcite and hematite are simple minerals, while granite is a mixture of three simple minerals--quartz, feldspar, and mica.
Industry:Mining
A mineral found in small, blue crystals; probably a mixture of sulfate of zinc and carbonate of copper.
Industry:Mining
A mineral group including fayalite, Fe<sub>2</sub>SiO<sub>4</sub>; forsterite, Mg<sub>2</sub>SiO<sub>4</sub>; liebenbergite, (Ni,Mg)<sub>2</sub>SiO<sub>4</sub>; and tephroite, Mn<sub>2</sub>SiO<sub>4</sub>; orthorhombic; olive green, grayish green, brown, or black; members intermediate in the forsterite-fayalite crystal solution series are common rock-forming minerals in gabbros, basalts, peridotites, and dunites; alters hydrothermally to serpentine. Fayalite occurs in some granites and syenites, forsterite in thermally metamorphosed dolomites, and tephroite in iron manganese ore deposits and their associated skarns.
Industry:Mining
A mineral group including fayalite, Fe<sub>2</sub>SiO<sub>4</sub>; forsterite, Mg<sub>2</sub>SiO<sub>4</sub>; liebenbergite, (Ni,Mg)<sub>2</sub>SiO<sub>4</sub>; and tephroite, Mn<sub>2</sub>SiO<sub>4</sub>; orthorhombic; olive green, grayish green, brown, or black; members intermediate in the forsterite-fayalite crystal solution series are common rock-forming minerals in gabbros, basalts, peridotites, and dunites; alters hydrothermally to serpentine. Fayalite occurs in some granites and syenites, forsterite in thermally metamorphosed dolomites, and tephroite in iron manganese ore deposits and their associated skarns.
Industry:Mining
A mineral group including fayalite, Fe<sub>2</sub>SiO<sub>4</sub>; forsterite, Mg<sub>2</sub>SiO<sub>4</sub>; liebenbergite, (Ni,Mg)<sub>2</sub>SiO<sub>4</sub>; and tephroite, Mn<sub>2</sub>SiO<sub>4</sub>; orthorhombic; olive green, grayish green, brown, or black; members intermediate in the forsterite-fayalite crystal solution series are common rock-forming minerals in gabbros, basalts, peridotites, and dunites; alters hydrothermally to serpentine. Fayalite occurs in some granites and syenites, forsterite in thermally metamorphosed dolomites, and tephroite in iron manganese ore deposits and their associated skarns.
Industry:Mining
