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Definition of Groundmass
1. Noun. (geology) the matrix of fine-grained crystalline material in which larger crystals are embedded.
Generic synonyms: Igneous Rock
Substance meronyms: Porphyritic Rock, Porphyry
Definition of Groundmass
1. Noun. (geology) The matrix of fine-grained crystalline material in which larger crystals are embedded. ¹
¹ Source: wiktionary.com
Definition of Groundmass
1. [n -ES]
Lexicographical Neighbors of Groundmass
Literary usage of Groundmass
Below you will find example usage of this term as found in modern and/or classical literature:
1. The Ancient Volcanoes of Great Britain by Archibald Geikie (1897)
"The groundmass of this rock, ... the groundmass having become a crystalline
granular aggregate of quartz and felspar with scattered porphyritic crystals of ..."
2. The Roman Comagmatic Region by Henry Stephens Washington (1906)
"groundmass; not always present, sometimes about 2 per cent, 0.05 to o.io mm.,
... groundmass: not always present, up to about 8 per cent, anhedral, ..."
3. The Journal of Geology by University of Chicago Department of Geology and Paleontology (1906)
"groundmass and phenocrysts are the essential parts of porphyritic fabric, variations
in which produce different porphy- ritic fabrics. ..."
4. Igneous Rocks: Composition, Texture and Classification, Description and by Joseph Paxson Iddings (1913)
"The assumption of solution in these cases implies the diffusion of the dissolved
silica into the surrounding groundmass. It is possible that such inclusions ..."
5. Report by Tasmania Dept. of Mines (1897)
"The groundmass is ... groundmass is plentiful in some of the dolerite neai Bothwell.
... or otherwise indistinct groundmass exists in ..."
6. Bulletin by Harvard University Museum of Comparative Zoology (1895)
"The basal cleavage is well developed, and the striae, or fine twinning, are well
marked in polarized light The groundmass is more generally composed of the ..."
7. Observations of a Naturalist in the Pacific Between 1896 and 1899 by Henry Brougham Guppy (1903)
"FOURTH ORDER OF THE HORNBLENDE-HYPERSTHENE- ANDESITES (groundmass ... They have
a crypto-crystalline groundmass where the ..."
8. Bulletin of the American Museum of Natural History by American Museum of Natural History (1914)
"Microscopic: Fragments of quartz, NaCa feldspar, augite, hornblende and an opaque
alteration product in a groundmass of a greenish color, consisting largely ..."
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