phenocrysts

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English - English

Definition of phenocrysts in English English dictionary: plural of phenocryst
phenocryst: Any relatively large, conspicuous crystal in a porphyritic igneous rock compare porphyroblast
phenocryst: One of the prominent embedded crystals of a porphyry
phenocryst: any relatively large crystal embedded in a more fine-grained or glassy igneous rock
phenocryst: 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
phenocryst: A course crystal in the fine-grained matrix of the igneous rock called porphyry

phenocrysts

Pronunciation

[ -"krist ] (noun.) circa 1893. French phénocryste, from Greek phainein to show + krystallos crystal; more at FANCY.

History

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