porphyrite definition

  • noun:
    • A rock with a porphyritic construction.
    • A rock with a porphyritic framework.
    • The name provided to those porphyries in which the ground-mass consists chiefly of a triclinic, feldspar, along with either augite or hornblende, or, in many cases, of biotite: in this ground-mass bigger crystals of the same species tend to be porphyritically developed.

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