phenocryst(redirected from Phenocrist)
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A conspicuous, usually large, crystal embedded in porphyritic igneous rock.
(Geological Science) any of several large crystals that are embedded in a mass of smaller crystals in igneous rocks such as porphyry
[C19: from pheno- (shining) + crystal]
phe•no•cryst(ˈfi nə krɪst, ˈfɛn ə-)
any of the conspicuous crystals in a porphyritic rock.