groundmass

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groundmass:

see porphyryporphyry
, igneous rock composed of large, conspicuous crystals (phenocrysts) and a groundmass in which the phenocrysts are embedded. Some authorities consider the expression "porphyritic rock" better usage than porphyry, since the term refers only to the texture of the
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groundmass

[′grau̇nd‚mas]
(analytical chemistry)