phenocryst

phenocryst

A crystal significantly larger than crystals of surrounding minerals.
Source: Leet, L. Don. 1982. Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
A term for large crystals or mineral grains floating in the matrix or groundmass of a porphyry. Syn: inset
Source: Dictionary of Mining, Mineral, and Related Terms

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