- المجال: Mining
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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 siderite occurring in globular concretionary aggregates of bladelike crystals radiating from a center, generally in a clayey matrix (such as those in or below underclays associated with coal measures). It appears to be the result of weathering of 3032 water-logged sediments in which iron, leached out of surface soil, is redeposited in a lower zone characterized by reducing conditions. Also spelled sphaerosiderite.
Industry:Mining
A variety of spessartine garnet, with yttrium substituting for manganese up to 2%, in pegmatites at Elk Mountain, NM. See: spessartine
Industry:Mining
A variety of sphalerite that gives off sparks or glows when abraded. Some pieces are so sensitive that the effect is obtained by scratching them with a fingernail.
Industry:Mining
A variety of spinel containing chromium, (Mg,Fe)(Al,Cr)<sub>2</sub>O<sub>4</sub>. Formerly called picotite. See: chrome spinel
Industry:Mining
A variety of steel containing up to 5% silicon. It is very hard, but is brittle and difficult to work.
Industry:Mining
A variety of talc with randomly stacked structure; forms a series with nickel-kerolite. Also spelled cerolite.
Industry:Mining