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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
/ ˈɡ°ù²¹ÊŠ²Ô»åËŒ³¾Ã¦²õ /
noun
- the matrix of igneous rocks, such as porphyry, in which larger crystals (phenocrysts) are embedded
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˜yÐÄvlog History and Origins
Origin of groundmass1
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Example Sentences
Examples have not been reviewed.
The groundmass they're in speaks of fairly rapid cooling and low pressure conditions.
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Olivine rarely occurs as an ingredient of the groundmass.
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Pyroxene, quartz and augite form the groundmass, as seen in section.Â
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