- 行业: Mining
- Number of terms: 33118
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- Company Profile:
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 monoclinic mineral, (Mg,Fe)<sub>3</sub>Si<sub>2</sub>O<sub>5</sub>(OH)<sub>4</sub>; kaolinite-serpentine group; polymorphous with clinochrysotile, lizardite, orthochrysotile, parachrysotile; greasy variegated green; used as an ornamental stone.
Industry:Mining
A monoclinic mineral, (Mg,Fe)<sub>5</sub>(SiO<sub>4</sub>)<sub>2</sub>(F,OH)<sub>2</sub>; humite group; commonly occurs in contact-metamorphosed dolomites. Also spelled condrodite.
Industry:Mining
A monoclinic mineral, (Mg,Fe,Al)<sub>6</sub>(Si,Al)<sub>8</sub>O<sub>20</sub>(OH)<sub>4</sub>.8H<sub>2</sub>O ; mica group; basal cleavage; soft; pearly; a hydrothermal or weathering alteration of biotite; expands 6 to 20 times by thermal exfoliation; occurs in clay sizes in soils and as crystals and megacrysts in ultramafic rocks; in Montana, North Carolina, South Carolina, Wyoming, Virginia, Colorado, and South Africa.
Industry:Mining
A monoclinic mineral, (Mg,Fe,Al)<sub>6</sub>(Si,Al)<sub>8</sub>O<sub>20</sub>(OH)<sub>4</sub>.8H<sub>2</sub>O ; mica group; basal cleavage; soft; pearly; a hydrothermal or weathering alteration of biotite; expands 6 to 20 times by thermal exfoliation; occurs in clay sizes in soils and as crystals and megacrysts in ultramafic rocks; in Montana, North Carolina, South Carolina, Wyoming, Virginia, Colorado, and South Africa.
Industry:Mining
A monoclinic mineral, (Mg,Fe,Ca)(Mg,Fe)Si<sub>2</sub>O<sub>6</sub>; pyroxene group; crystallographically distinct from augite; occurs only in quickly chilled lavas. Compare: augite
Industry:Mining
A monoclinic mineral, (Mg,Fe,Mn)<sub>2</sub>(PO<sub>4</sub>)F ; yellow.
Industry:Mining
A monoclinic mineral, (Mg,Mn)<sub>3</sub>Zn<sub>2</sub>(AsO<sub>4</sub>)(OH,O)<sub>6</sub>; associated with manganese silicates at Franklin, NJ.
Industry:Mining
A monoclinic mineral, (Mg,Mn)<sub>9</sub>Zn<sub>4</sub>(SO<sub>4</sub>)<sub>2</sub>(OH)<sub>22</sub>.8H<sub>2</sub>O ; related to mooreite and lawsonbauerite; at Sterling Hill, NJ.
Industry:Mining
A monoclinic mineral, (Mg<sub>3</sub>(AsO<sub>4</sub>)<sub>2</sub>.8H<sub>2</sub>O); vivianite group, with Mg replaced by Co toward erythrite; in white crystals resembling gypsum; also columnar; a secondary mineral formed by alteration of arsenate minerals.
Industry:Mining
A monoclinic mineral, (Mn, Mg)<sub>13</sub>(Al, Fe)<sub>4</sub>Sb<sub>2</sub>Si<sub>2</sub>O<sub>28</sub>; in jet-black crystals in limestone at Nordmark and Laangban, Sweden.
Industry:Mining
