phenocryst

listen to the pronunciation of phenocryst
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fenokrist
English - English
any relatively large crystal embedded in a more fine-grained or glassy igneous rock
Any relatively large, conspicuous crystal in a porphyritic igneous rock compare porphyroblast
One of the prominent embedded crystals of a porphyry
Large grains surrounded by smaller grains (groundmass) Indicates a two-stage cooling history in a magma where slow cooling well below the earth's surface formed the phenocrysts followed by rise and rapid cooling at shallow levels to form the groundmass
A course crystal in the fine-grained matrix of the igneous rock called porphyry
phenocrysts
plural of phenocryst