- Industry: Mining
- Number of terms: 33118
- Number of blossaries: 0
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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 ...
An alluvial fan with steep slopes; it is generally higher and narrower than a fan, and is composed of coarser and thicker material believed to have been deposited by larger streams. The term is sometimes used synonymously with alluvial fan. Compare: alluvial fan
Industry:Mining
An alluvial fan with steep slopes; it is generally higher and narrower than a fan, and is composed of coarser and thicker material believed to have been deposited by larger streams. The term is sometimes used synonymously with alluvial fan. Compare: alluvial fan
Industry:Mining
An alluvial fan with steep slopes; it is generally higher and narrower than a fan, and is composed of coarser and thicker material believed to have been deposited by larger streams. The term is sometimes used synonymously with alluvial fan. Compare: alluvial fan
Industry:Mining
An almost opaque common opal; commonly yellow-brown, reddish brown to red owing to iron oxides; resembles opal but has the luster of common opal.
Industry:Mining
An almost opaque common opal; commonly yellow-brown, reddish brown to red owing to iron oxides; resembles opal but has the luster of common opal.
Industry:Mining
An altered basalt, characteristically amygdaloidal or vesicular, in which the feldspar has been albitized and is typically accompanied by chlorite, calcite, epidote, chalcedony, prehnite, or other low-temperature hydrous crystallization products characteristic of a greenstone. Spilite often occurs as submarine lava flows and exhibits pillow structure. Adj: spilitic. The name was given by Brongniart in 1827.
Industry:Mining
An altered enstatite or bronzite, having approx. the composition of serpentine.
Industry:Mining
An altered enstatite or bronzite, having approx. the composition of serpentine.
Industry:Mining
An altered rock consisting mainly of dark opal and chalcedony, commonly associated with ore in California mercury deposits in serpentine.
Industry:Mining
