phenocryst


Concise Oxford English Dictionary © 2008 Oxford University Press:
phenocryst /ˈfiːnə(ʊ)krɪst, ˈfɛn-/
noun Geology a large or conspicuous crystal in a porphyritic rock.
– origin C19: from Fr. phénocryste, from Gk phainein ‘to show’ + krustallos ‘crystal’.
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