1. Textural term for igneous rocks in which large crystals, called phenocrysts, are set in finer groundmass, which may be crystalline or glass or both.
    Source: Leet, L. Don. 1982. Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
     
  2. a. Said of the texture of an igneous rock in which larger crystals (phenocrysts) are set in a finer-grained groundmass, which may be crystalline or glassy or both. Also, said of a rock with such texture, or of the mineral forming the phenocrysts. AGI
    b. Pertaining to or resembling porphyry. AGI
    Source: Dictionary of Mining, Mineral, and Related Terms











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