- 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 ...
A transparent quartz crystal containing minute air-filled or liquid-filled internal cracks that produce iridescence by interference of light. The cracks may occur naturally or be caused artificially by heating and sudden cooling of the specimen.
Industry:Mining
A transparent to translucent yellow, orange, red, or brown variety of opal that gives out fiery reflections in bright light with or without a play of color. Compare: gold opal
Industry:Mining
A transparent, green variety of andradite, having a brilliant luster and used as a gem.
Industry:Mining
A transparent, green variety of andradite, having a brilliant luster and used as a gem.
Industry:Mining
A transparent, pure, optically clear variety of calcite principally in Iceland in vugs and cavities in basalt; formerly used in optical instruments such as nicol prisms, but has been replaced by artificial materials such as polaroid plates.
Industry:Mining
A transparent, pure, optically clear variety of calcite principally in Iceland in vugs and cavities in basalt; formerly used in optical instruments such as nicol prisms, but has been replaced by artificial materials such as polaroid plates.
Industry:Mining
A transparent, pure, optically clear variety of calcite principally in Iceland in vugs and cavities in basalt; formerly used in optical instruments such as nicol prisms, but has been replaced by artificial materials such as polaroid plates.
Industry:Mining
A transporter crane on which the track for the carrier is a steel wire rope.
Industry:Mining
