phenocryst

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phe·no·cryst

 (fē′nə-krĭst′)
n.
A conspicuous, usually large, crystal embedded in porphyritic igneous rock.


phe′no·crys′tic adj.

phenocryst

(ˈfiːnəˌkrɪst; ˈfɛn-)
n
(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-)

n.
any of the conspicuous crystals in a porphyritic rock.
[1890–95; pheno- + cryst (al)]
References in periodicals archive ?
Modal composition was given based on the phenocrist assemblage of each rock, together with their detailed description based on hand samples and thin sections.