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Definition of porphyritic

i. 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.

Ref: AGI

ii. Pertaining to or resembling porphyry.

Ref: AGI


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