[fee-nuh-krist, fen-uh-] /ˈfi nə krɪst, ˈfɛn ə-/

noun, Petrology.
any of the conspicuous in a porphyritic rock.
/ˈfiːnəˌkrɪst; ˈfɛn-/
any of several large crystals that are embedded in a mass of smaller crystals in igneous rocks such as porphyry
A large crystal that is surrounded by a finer-grained matrix in an igneous rock. Phenocrysts are usually the first crystals to form from a cooling magma, and therefore have sufficient room to grow to a large size. They are analogous to porphyroblasts in metamorphic rock.


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