- 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 trigonal and hexagonal mineral, (Zn,Fe)S ; dimorphous with sphalerite; resinous; brownish black; forms hemimorphic pyramidal crystals or radiating needles and bundles within lamellar sphalerite.
Industry:Mining
A trigonal and hexagonal mineral, Mg<sub>3</sub>Si<sub>2</sub>O<sub>5</sub>(OH)<sub>4</sub>; kaolinite-serpentine group; polymorphous with antigorite, clinochrysotile, orthochrysotile, and parachrysotile; forms a series with nepouite; in platy masses as an alteration product of ultramafic rocks; the most abundant serpentine mineral.
Industry:Mining
A trigonal mineral, (B,Ca)Al<sub>3</sub>(PO<sub>4</sub>,SiO<sub>4</sub>)<sub>2</sub>(OH)<sub>6</sub>; crandallite group; white; in Uganda.
Industry:Mining
A trigonal mineral, (Ba,Sr)<sub>6</sub>(Ca,Mn)<sub>6</sub>Mg(CO<sub>3</sub>)<sub>13</sub>; shows flat, simple rhombohedral crystals and cleavage; fluoresces yellow or red; in veins with calcite.
Industry:Mining
A trigonal mineral, (Ca,Na<sub>2</sub>,K<sub>2</sub>)<sub>3</sub>Al<sub>6</sub>Si<sub>12</sub>O<sub>36</sub>.18H<sub>2</sub>O ; zeolite group; in cavities in basalts with other zeolites. Also spelled levynite; levyine; levyite.
Industry:Mining
A trigonal mineral, (Ce,Ca)<sub>10</sub>(SiO<sub>4</sub>)<sub>6</sub>(OH,F)<sub>5</sub>; generally brown, massive.
Industry:Mining
A trigonal mineral, (Ce,La,Y,Th)<sub>5</sub>(Si,B,Al)<sub>3</sub>(O,OH,F)<sub>13</sub>(?) ; moderately radioactive; metamict; dark brown; in syenite with leucophanite, analcime, mosandrite, aegirine, and catapleiite. Formerly called spencite.
Industry:Mining
A trigonal mineral, (Fe,Mg)<sub>9</sub>Al<sub>4</sub>Cl<sub>18</sub>(OH)<sub>12</sub>.14H<sub>2</sub>O ; massive fine granular; at Hanover, Germany.
Industry:Mining
A trigonal mineral, (Fe,Ni)<sub>9</sub>S<sub>11</sub>or (Fe,Ni)<sub>13</sub>S<sub>16</sub>; physical properties are almost identical with monoclinic pyrrhotine.
Industry:Mining
