- 行业: 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 quarry term for a more or less minute vein or dike of muscovite (white mica) with some quartz, in cases also with feldspar.
Industry:Mining
A quarry term for the wedging-in of the end of a granite sheet under an overhanging joint, probably in consequence of the faulting of the sheets along the joint. It is also applied to the overlapping of lenticular sheets.
Industry:Mining
A quarry worker's term for the formation of fractures caused by the cutting bars of a channeling machine striking the rock with excessively heavy blows.
Industry:Mining
A quarry worker's term for trimming an edge of a block of stone with a hammer and set.
Industry:Mining
A quarry worker's term, used originally in Purbeck, southern England, for thin, flat-lying veins or layers of fibrous calcite, anhydrite, gypsum, halite, or silica, occurring along bedding planes of shale, giving a resemblance to beef. It appears to be due to rapid crystallization in lenticular cavities.
Industry:Mining
A quarryman's term for blocks with two parallel sets of sides at right angles and one parallel set not at right angles.
Industry:Mining
A quarryman's term for slate containing abundant deformed or squeezed concretions.
Industry:Mining
