porphyry

Noun
  1. Any igneous rock with crystals embedded in a finer groundmass of minerals (synset 115020962)
    is a type of: igneous rock - rock formed by the solidification of molten magma
    substance holonym: groundmass - (geology) the matrix of fine-grained crystalline material in which larger crystals are embedded
    same as: porphyritic rock

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