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groundmass
[ ground-mas ]
noun
- the crystalline, granular, or glassy base or matrix of a porphyritic or other igneous rock, in which the more prominent crystals are embedded.
groundmass
/ ˈɡraʊndˌmæs /
noun
- the matrix of igneous rocks, such as porphyry, in which larger crystals (phenocrysts) are embedded
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Word History and Origins
Origin of groundmass1
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Example Sentences
The groundmass they're in speaks of fairly rapid cooling and low pressure conditions.
From Scientific American
Olivine rarely occurs as an ingredient of the groundmass.
From Project Gutenberg
Pyroxene, quartz and augite form the groundmass, as seen in section.
From Project Gutenberg
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