groundmass
IPA: grˈaʊndmæs
noun
- (geology) The matrix of fine-grained crystalline material in which larger crystals are embedded.
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Examples of "groundmass" in Sentences
- The groundmass of porphyritic igneous rocks.
- This means they are older than the groundmass.
- The alkali feldspar is confined to the groundmass.
- The microgranite is porphyritic with a very fine groundmass.
- The grain size of the groundmass stays in the 5 millimeter range.
- They consist of phenocrysts embedded in a fine grained groundmass.
- The groundmass of these rocks is composed of plagioclase and quartz.
- The groundmass contains interstitial quartz or tridymite or cristobalite.
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