- 行业: 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 ...
A pervasive, parallel foliation of fine-grained, platy minerals (mainly chlorite and sericite) in a direction perpendicular to the direction of maximum finite shortening, developed in slate or other homogeneous sedimentary rocck by deformation and lowgrade metamorphism. Most slaty cleavage is also axial-plane cleavage.
Industry:Mining
A phase transformation not involving structural rearrangement, e.g., Curie point in magnetism.
Industry:Mining
A phase transformation requiring change in coordination about a cation, e.g., quartz with silica tetrahedra to stishovite with silica octahedra. Compare: reconstructive transformation; displacive transformation; rotational transformation.
Industry:Mining
A phenocryst that after crystallization is more or less reabsorbed or attacked by the magma, or a crystal in a vein or a pegmatite that is partly dissolved by later solutions. The process is probably much the same in all three instances.
Industry:Mining
A phenocrystalline variety of quartz colored purplish or bluish violet by manganese.
Industry:Mining
A phenomenon associated with the transformation of alpha iron to gamma iron on the heating (superheating) of iron or steel, revealed by the darkening of the metal surface owing to the sudden decrease in temperature caused by the fast absorption of the latent heat of transformation.
Industry:Mining
A phenomenon associated with the transformation of alpha iron to gamma iron on the heating (superheating) of iron or steel, revealed by the darkening of the metal surface owing to the sudden decrease in temperature caused by the fast absorption of the latent heat of transformation.
Industry:Mining
A phenomenon involving a solid and a liquid in such intimate contact that the adhesive force between the two phases is greater than the cohesive force within the liquid. Thus, a solid that is wetted, on being removed from the liquid bath, will have a thin continuous layer of liquid adhering to it. Foreign substances, such as grease, may prevent wetting. Addition agents, such as detergents, may induce wetting by lowering the surface tension of the liquid. Compare: water break
Industry:Mining
A phenomenon, associated with the transformation of gamma iron to alpha iron on the cooling (supercooling) of iron or steel, revealed by the brightening (reglowing) of the metal surface owing to the sudden increase in temperature caused by fast liberation of the latent heat of transformation.
Industry:Mining
