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anorthosite (countable and uncountable, plural anorthosites)

  1. (petrology) A phaneritic, intrusive igneous rock characterized by a predominance of plagioclase feldspar.
    • 1863, T. Sterry Hunt, "On the Chemical and Mineralogical Relations of Metamorphic Rocks", The American Journal of Science and Arts, Volume XXXVI, November, 1863, page 224:
      The second, or Labrador series is characterized, as already remarked, by the predominance of great beds of anorthosite, composed chiefly of triclinic feldspars . . .