- 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 ...
Said of a process or event lasting or persisting for an indefinitely long period of time, e.g., secular variation; progressive or cumulative rather than cyclic.
Industry:Mining
Said of a process or of a deposit involving the intrusion and/or extrusion of magma.
Industry:Mining
Said of a relict texture in a metamorphic rock in which traces of an original ophitic texture remain.
Industry:Mining
Said of a relict texture in a metamorphic rock in which traces of an original porphyritic texture remain.
Industry:Mining
Said of a rock formed by the solidification of magma; i.e., either an extrusive or an intrusive rock. Most writers restrict the term to its extrusive or volcanic sense.
Industry:Mining
Said of a rock of compact texture, composed of extremely small, fragmental particles that are barely visible under a microscope.
Industry:Mining
Said of a rock or mineral deposit formed by a gaseous agent. Compare: hydatogenic; hydatopneumatogenic; pneumatolytic.
Industry:Mining
Said of a rock or mineral deposit formed by both aqueous and gaseous agents. Compare: hydatogenic; pneumatogenic.
Industry:Mining
Said of a rock or mineral that solidified from molten or partly molten material, i.e., from a magma; also, applied to processes leading to, related to, or resulting from the formation of such rocks. Igneous rocks constitute one of the three main classes into which rocks are divided, the others being metamorphic and sedimentary. Etymol: Latin ignis, fire.
Industry:Mining
