groundmass

ground·mass

G0283600 (ground′măs′)n. The fine-grained crystalline base of porphyritic rock in which larger crystals are embedded.

groundmass

(ˈɡraʊndˌmæs) n (Geological Science) the matrix of igneous rocks, such as porphyry, in which larger crystals (phenocrysts) are embedded

ground•mass

(ˈgraʊndˌmæs)

n. the crystalline, granular, or glassy base or matrix of a porphyritic or other igneous rock, in which the more prominent crystals are embedded. [1875–80]

Thesaurus

Noun

groundmass - (geology) the matrix of fine-grained crystalline material in which larger crystals are embeddedgeology - a science that deals with the history of the earth as recorded in rocksigneous rock - rock formed by the solidification of molten magmaporphyritic rock, porphyry - any igneous rock with crystals embedded in a finer groundmass of minerals

groundmass

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) matrix

groundmass

Related to groundmass: mafic, Phaneritic, vesicular

noun

Words related to groundmass

noun (geology) the matrix of fine-grained crystalline material in which larger crystals are embedded

Related Words

geology
igneous rock
porphyritic rock
porphyry

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