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[pawr-fuh-rit-ik] /ˌpɔr fəˈrɪt ɪk/

adjective, Petrology.
of, pertaining to, containing, or resembling , its texture, or its structure.
(of rocks) having large crystals in a fine groundmass of minerals
consisting of porphyry
An igneous rock containing the large crystals known as phenocrysts embedded in a fine-grained matrix.

porphyritic adjective (pôr’fə-rĭt’ĭk)


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  • Porphyroblast

    porphyroblast (pôr-fîr’ē-ə-blāst’) A large crystal that is surrounded by a finer-grained matrix in a metamorphic rock. Porphyroblasts form by the recrystallization of existing mineral crystals during metamorphism. They are analogous to phenocrysts in igneous rock.

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