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phenocrystAny relatively large, conspicuous crystal in a porphyritic igneous rock. compare porphyroblast.
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phenocrystLarge crystal surrounded by much smaller crystals in porphyritic igneous rock.
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phenocrystA term used to describe large crystals embedded in a mass of finer crystals (groundmass) in an igneous rock
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phenocrystA term used to describe large crystals embedded in a mass of finer crystals (groundmass) in an igneous rock. See 'porphyritic'.
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phenocrystA prominent crystal surrounded by smaller grains in a porphyritic rock.
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phenocrystLarge crystal surrounded by much smaller crystals in porphyritic igneous rock.
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