- المجال: 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 brown to red deep-sea deposit, which usually contains manganese nodules or a film of manganese. It is the finest divided clay suspension that is derived from the land and transported by ocean currents, accumulating far from land and at the greatest depths. It has a high proportion of volcanic material due to lesser dilution of this material owing to slowness of accumulation of the clay portion. The color is believed to be caused by oxidation.
Industry:Mining
A brown variety of agate displaying on polished surfaces markings that resemble the outlines of ruined buildings.
Industry:Mining
A brown variety of gahnite containing manganese and iron in Massachusetts and New Jersey.
Industry:Mining
A brown variety of pyromorphite containing calcium from Mies, Czech Republic.
Industry:Mining
A brown variety of retinite; sp gr, 1.015 to 1.027; found on the shores of the Baltic Sea.
Industry:Mining
A brown, resinous, brittle mineral found between layers of coal at the Middleton collieries, near Leeds, England, and also at Newcastle.
Industry:Mining
A brownish-red to garnet-red, transparent to translucent, hydrous manganese arsenate, Mn<sub>3</sub>(AsO<sub>4</sub>)(OH)<sub>3</sub>.H<sub>2</sub>O ; soon turns black; Mohs hardness, 3; sp gr, 3.50 to 3.65; rare; from Nordmark, Sweden.
Industry:Mining
