- Industry: Mining
- Number of terms: 33118
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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 inferior greenish cat's eye obtained in the Fichtelgebirge in Bavaria. No such stone occurs in Hungary.
Industry:Mining
An influence line usually pertains to a particular section of a beam, and is a curve so drawn that its ordinate at any point represents the value of the reaction, vertical shear, bending moment, or deflection produced at the particular section by a unit load applied at the point where the ordinate is measured. An influence line may be used to show the effect of load position on any quantity dependent thereon, such as the stress in a given truss member, the deflection of a truss, the twisting moment in a shaft, etc.
Industry:Mining
An informal name applied loosely to any indefinite traillike or tunnellike sedimentary structure identified as a trace fossil but not referred to a described genus. It was once considered to be the remains of the marine alga Fucus, and later was regarded as a feeding burrow of a marine animal and assigned to the plantlike genus Fucoides. The term has been broadly applied to crustacean tracks, worm burrows, molluscan trails, marks made by the tide or waves, and rill marks.
Industry:Mining
An informal rock stratigraphic unit bounded by marker horizons believed to be isochronous surfaces that can be traced across facies changes, particularly in the subsurface; useful for correlations between areas where the stratigraphic section is divided into different formations that do not correspond in time value.
Industry:Mining
An informal term applied to any light-colored igneous rock in which the mineral grains are too small to be distinguished by the unaided eye. Compare: felsite
Industry:Mining
An informal term for sodic feldspar, i.e. albite, or for a feldspar mixture assaying at least 7% Na<sub>2</sub>O.
Industry:Mining
An informal term for sodic feldspar, i.e. albite, or for a feldspar mixture assaying at least 7% Na<sub>2</sub>O.
Industry:Mining
