- 行业: Mining
- Number of terms: 33118
- Number of blossaries: 0
- 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 ...
An isometric mineral, (Ca,Ti,Al,Zr)<sub>2</sub>O<sub>3</sub>; forms black octahedra in a nepheline syenite near Lake Magad, Tanzania.
Industry:Mining
An isometric mineral, (Cs, Na)<sub>2</sub>Al<sub>2</sub>Si<sub>4</sub>O<sub>12</sub>.H<sub>2</sub>O ; zeolite group; forms a series with analcime; colorless; occurs in granite pegmatites; a source of cesium and a minor gemstone.
Industry:Mining
An isometric mineral, (Cs, Na)<sub>2</sub>Al<sub>2</sub>Si<sub>4</sub>O<sub>12</sub>.H<sub>2</sub>O ; zeolite group; forms a series with analcime; colorless; occurs in granite pegmatites; a source of cesium and a minor gemstone.
Industry:Mining
An isometric mineral, (Cu,Fe)<sub>12</sub>As<sub>4</sub>S<sub>13</sub>; tetrahedrite group; forms a series with tetrahedrite; may contain zinc, silver, or cobalt replacing copper; in veins; an important source of copper.
Industry:Mining
An isometric mineral, (Cu,Fe)<sub>12</sub>As<sub>4</sub>S<sub>13</sub>; tetrahedrite group; forms a series with tetrahedrite; may contain zinc, silver, or cobalt replacing copper; in veins; an important source of copper.
Industry:Mining
An isometric mineral, (Cu,Ni,Co,Fe)(S,Se)<sub>2</sub>; pyrite group; forms small iron-black cubooctahedra and radiating nodular masses; at Villamin, Spain.
Industry:Mining
An isometric mineral, (Fe,Ni) ; contains 27% to 65% nickel; occurs in iron meteorites as lamellae or strips flanking bands of kamacite.
Industry:Mining
An isometric mineral, (Fe,Ni) ; contains 27% to 65% nickel; occurs in iron meteorites as lamellae or strips flanking bands of kamacite.
Industry:Mining
An isometric mineral, (Ir,Pt) , with Ir 50% to 80% (atomic) of Ir + Pt; forms silver-white grains having sp gr, 22.6 to 22.8; Mohs hardness, 6 to 7.
Industry:Mining
An isometric mineral, (K,Ca,Na)(W<sub>6</sub>,Fe<sub>3</sub>)(O,OH)<sub>6</sub>.H<sub>2</sub>O ; in minute yellow octahedra and platy aggregates; in Uganda, Rwanda, Zaire, Portugal, France, Washington, and Nevada.
Industry:Mining
