- 行业: 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 ...
Alternate expansion and contraction of air in breaks that allows fresh oxygen to be drawn in and oxidation to proceed.
Industry:Mining
Alternate spelling of laubanite, an orthorhombic mineral, Na<sub>16</sub>(Al<sub>16</sub>Si<sub>24</sub>O<sub>80</sub>).16H<sub>2</sub>O; zeolite group, which may contain appreciable calcium; dimorphous with tetranatrolite; forms acicular to slender prismatic crystals in cavities and veins, esp. in mafic and alkaline igneous rocks.
Industry:Mining
Alternate spelling of linnaeite, an isometric mineral, 8(Co<sub>3</sub>S<sub>4</sub>) ; commonly has small amounts of Ni, Fe, Cu; forms a series with polydymite; crystallizes in octahedra with cubic cleavage; metallic; steel gray tarnishing to copper red; in quartz sulfide veins; a source of cobalt.
Industry:Mining
Alternate spelling of lodestone, a variety of magnetite showing spontaneous magnetization because of preferential alignment of magnetic domains within a crystal or mass of crystals.
Industry:Mining
A colorless mineral, Mg 3 B 2 (OH) 6 (PO 4) 2 ·6H 2 O, composed of hydrous basic phosphate of magnesium and boron.
Industry:Mining