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groundmass

   Also found in: Encyclopedia, Wikipedia, Hutchinson 0.02 sec.
ground·mass  (groundms)
n.
The fine-grained crystalline base of porphyritic rock in which larger crystals are embedded.
groundmass [ˈgraʊndˌmæs]
n
(Earth Sciences / Geological Science) the matrix of igneous rocks, such as porphyry, in which larger crystals (phenocrysts) are embedded
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.groundmass - (geology) the matrix of fine-grained crystalline material in which larger crystals are embedded
geology - a science that deals with the history of the earth as recorded in rocks
igneous rock - rock formed by the solidification of molten magma
porphyritic rock, porphyry - any igneous rock with crystals embedded in a finer groundmass of minerals


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Despite the inclusion of statements such as 'all contain sanidine in the groundmass as well as significant amounts of plagioclase .
Vaulting ambition by Croft, Catherine / The Architectural Review
3) Pyrite occurs as disseminations in the groundmass of the intrusive and also within the matrix of the meta-sediments (hornfels).
Duncan Park Holdings Corporation Announces Polymetallic ... by Business Wire
Disseminated arsenopyrite and pyrite occurs in the groundmass of the porphyry and is related to the fracturing and subsequent alteration.
African Gold Group, Inc.: Mineralized Porphyry at Moseaso Yields ... by Business Wire
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