groundmass

Noun
  1. (geology) the matrix of fine-grained crystalline material in which larger crystals are embedded (synset 114915829)
    referred to in: geology - a science that deals with the history of the earth as recorded in rocks
    is a type of: igneous rock - rock formed by the solidification of molten magma
    substance meronym: porphyritic rock, porphyry - any igneous rock with crystals embedded in a finer groundmass of minerals

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