porphyry definition

  • noun:
    • Rock containing fairly large conspicuous crystals, specially feldspar, in a fine-grained igneous matrix.
    • a tough igneous rock comprising huge crystals in a fine-grained matrix
    • A term used significantly loosely to designate a rock composed of a fine-grained base (usually feldspathic) by which crystals, as of feldspar or quartz, tend to be disseminated. There are red, purple, and green types, that are extremely esteemed as marbles.
    • The English as a type of the Latin term porphyrites, employed by the Romans to designate a certain stone having a dark-crimson ground through which are scattered little crystals of feldspar.
    • A slab of porphyry, utilized in alchemy.
    • In zoology, a porphyry-moth.
    • In ceramics, a hard colored body created by Josiah Wedgwood, in replica of porphyry.
    • any igneous rock with crystals embedded in a finer groundmass of minerals

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