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{%type%} Definitions

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n. - The matrix of fine-grained crystalline material in which larger crystals are embedded.

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Usage examples (4)
  • Feldspar compositions in the groundmass are slightly more Or-rich than the phenocrystic feldspar, which ranges from An10Or15Ab75 to about An1Or44Ab55.
  • Figure parts a-e with crossed nichols. (a) Micrographic groundmass surrounds feldspar phenocryst fragment. (b) Micrographic groundmass around clinopyroxene...
  • K/Na of the groundmass feldspar equals K/Na in pumiceous glass of the host pumice, hinting that the granophyric minerals grew by closed-system crystallization of the...
  • We have begun a study of porphyritic pyroxene rhyolite, erupted as pyroclastic flow, and its intrusive equivalent, ejected during the same eruption as blocks of miarolitic...
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