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United States Bureau of Mines
Industry: 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 olive-green asbestiform variety of tremolite-actinolite. The term is used in the gem trade for a variety of quartz-containing, greenish, fibrous inclusions of actinolite or asbestos.
Industry:Mining
An oolith or nodule in fireclay. It may have a high content of alumina or iron oxide.
Industry:Mining
An opal, e.g., hydrophane, artificially impregnated with melted wax.
Industry:Mining
An opaline variety of allophane rich in aluminum. Material at the type locality is a mixture of glassy hyalophane and earthy variscite.
Industry:Mining
An opaque onyx, part or all of whose bands consist of jasper.
Industry:Mining
An opaque or feebly translucent, bluish-white, pale-yellowish, or reddish variety of common opal containing a little alumina.
Industry:Mining
An opaque or feebly translucent, bluish-white, pale-yellowish, or reddish variety of common opal containing a little alumina.
Industry:Mining
An opaque or feebly translucent, bluish-white, pale-yellowish, or reddish variety of common opal containing a little alumina.
Industry:Mining
An opaque variety of thompsonite from the Lake Superior region.
Industry:Mining
An opaque, dark-brown variety of retinite containing about 0.5% sulfur in lignite at Dux, Bohemia, Czech Republic; is similar to muckite, walchowite, and neudorfite.
Industry:Mining