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Definition of: groundmass

(groundmas′) noun Geol.
A compact and fine-grained or glassy portion of porphyritic igneous rock, in which the phenocrysts, or larger, distinct crystals, are embedded.

Most often used phrases:

grained groundmass

Phrases starting with the letter: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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