Groundmass (noun) Definition, Meaning & Examples

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noun
  1. the crystalline, granular, or glassy base or matrix of a porphyritic or other igneous rock, in which the more prominent crystals are embedded.
noun
  1. the matrix of igneous rocks, such as porphyry, in which larger crystals (phenocrysts) are embedded
Groundmass (noun) Definition, Meaning & Examples

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