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  • (anthropology, archaeology) a fine-grained volcanic rock used for the manufacture of chipped stone artifacts. Color black to gray, texture granular to glass-like.
  • (environment) Consistent year-round energy use of a facility; also refers to the minimum amount of electricity supplied continually to a facility.
    Source: Terms of the Environment
  • (geology)
  1. A fine-grained colored extrusive rocks.
    Source: Leet, L. Don. 1982. Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
  2. A general term for dark-colored mafic igneous rocks, commonly extrusive but locally intrusive (e.g., as dikes), composed chiefly of calcic plagioclase and clinopyroxene; the fine-grained equivalent of gabbro. Nepheline, olivine, orthopyroxene, or quartz may be present. Adj. basaltic. CF: tholeiite
    Source: Dictionary of Mining, Mineral, and Related Terms

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