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porphyroblast

American  
[pawr-fer-oh-blast] / ˈpɔr fər oʊˌblæst /

noun

plural

porphyroblasts

  1. Geology. metacryst.

porphyroblast Scientific  
/ pôr-fîr′ə-blăst′ /

  1. A large crystal that is surrounded by a finer-grained matrix in a metamorphic rock. Porphyroblasts form by the recrystallization of existing mineral crystals during metamorphism. They are analogous to phenocrysts in igneous rock.

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.