Porphyroblast meaning

pôr-fîr'ə-blăst'
A large crystal that is surrounded by a fine-grained matrix in a metamorphic rock and forms from the recrystallization of existing mineral crystals during metamorphism.
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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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Origin of porphyroblast

  • porphyr(y) —blast
    From American Heritage Dictionary of the English Language, 5th Edition