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noun(geology) the matrix of fine-grained crystalline material in which larger crystals are embeddedtype of:
Definition that contains groundmass
- porphyry any igneous rock with crystals embedded in a finer groundmass of minerals
- porphyritic (of rocks) consisting of porphyry or containing large crystals in a fine groundmass of minerals
- porphyritic rock any igneous rock with crystals embedded in a finer groundmass of minerals