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The fine-grained crystalline base of porphyritic rock in which larger crystals are embedded.
(Geological Science) the matrix of igneous rocks, such as porphyry, in which larger crystals (phenocrysts) are embedded
the crystalline, granular, or glassy base or matrix of a porphyritic or other igneous rock, in which the more prominent crystals are embedded.
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|Noun||1.||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