- المجال: 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 variety of pisolitic limonite or "bean ore" occurring in small, rounded grains or masses.
Industry:Mining
A variety of pisolitic limonite or "bean ore" occurring in small, rounded grains or masses.
Industry:Mining
A variety of precious opal exhibiting a deep green play of color; esp. a Mexican opal exhibiting emerald-green play of color and flashes of carmine, dark violet, dark blue, and purple.
Industry:Mining
A variety of pyrobitumen having a shining conchoidal fracture and occurring in the form of veins. It is partly soluble in organic solvent; sp gr, 1.2. In many ways it is similar to grahamite. It is assumed that it represents a weathering product of albertite. From the South Urals, Russia.
Industry:Mining
A variety of quartz containing within the crystal whitish or colored starlike radiations along the diametral planes. The asterism is due to the inclusion of submicroscopic needles of another mineral arranged in parallel fashion. In star blue quartz in Virginia and Texas, the other mineral is rutile.
Industry:Mining
A variety of quartz porphyry containing small phenocrysts of quartz in a microgranitic groundmass of quartz, orthoclase, albite, and mica. The rock has a characteristically spotted or streaked appearance due to staining by hydroxides of iron and manganese.
Industry:Mining
A variety of quartz, named for the fancied resemblance of the crystal to the successive tiers of the Tower of Babel.
Industry:Mining
