nephelinite definition

  • noun:
    • An igneous stone consisting mainly of pyroxene and nepheline.
    • a dark, finely crystalline rock of volcanic beginning, being a mixture of nepheline and pyroxene
    • The name given by Rosenbusch to what had previously been generally designated us “nephelin-dolerite.” The difference between this rock and nephelin-basalt is exceedingly slight. See nephelin-basalt.
    • an igneous stone composed of nepheline and pyroxene

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