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Definitions of groundmass
  1. noun
    (geology) the matrix of fine-grained crystalline material in which larger crystals are embedded
    type 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
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