- 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, Sb<sub>2</sub>O<sub>3</sub>; dimorphous with valentinite; resinous; Mohs hardness, 2 to 5; sp gr, 5.2 to 5.3.
Industry:Mining
An isometric mineral, ThO<sub>2</sub>; commonly contains lanthanides; has fluorite structure; forms a series with uraninite; highly radioactive and metamict; sp gr, 9.7; in pegmatites; in placers associated with zircon, ilmenite, geikielite, thorite, and other heavy minerals; an important source of uranium and thorium.
Industry:Mining
An isometric mineral, ThO<sub>2</sub>; commonly contains lanthanides; has fluorite structure; forms a series with uraninite; highly radioactive and metamict; sp gr, 9.7; in pegmatites; in placers associated with zircon, ilmenite, geikielite, thorite, and other heavy minerals; an important source of uranium and thorium.
Industry:Mining
An isometric mineral, Tl<sub>2</sub>O<sub>3</sub>; black; forms minute crystals.
Industry:Mining
An isometric mineral, Zn<sub>4</sub>Be<sub>3</sub>(SiO<sub>4</sub>)<sub>3</sub>S ; forms series with danalite and with helvite; in carbonatites and alkaline pegmatites.
Industry:Mining
An isometric mineral, ZnAl<sub>2</sub>O<sub>4</sub>; spinel group; forms series with spinel and with hercynite; Mohs hardness, 7-1/2; forms octahedra or masses in schists, contactmetamorphosed limestones, granite pegmatites; relatively common in replacement ores at Franklin, NJ, and Falun, Sweden.
Industry:Mining
An isometric mineral, ZnAl<sub>2</sub>O<sub>4</sub>; spinel group; forms series with spinel and with hercynite; Mohs hardness, 7-1/2; forms octahedra or masses in schists, contactmetamorphosed limestones, granite pegmatites; relatively common in replacement ores at Franklin, NJ, and Falun, Sweden.
Industry:Mining
An isometric mineral. CuI ; soft; oil brown; dodecahedral cleavage; at Broken Hill, New South Wales, Australia.
Industry:Mining
An isometric(?) mineral, Cu<sub>5</sub>Te<sub>3</sub>; bluish-black; at Vulcan, CO.
Industry:Mining
An item of surveying equipment, comprising a triangular steel plate with pointed studs at the corners. These studs are driven into the ground in the desired position. The plate is used either as a temporary bench mark or as a change point in running a line of levels.
Industry:Mining
