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groundmass::noun | Spocien Dictionary
| Type | Words |
|---|---|
| Type of | igneous rock |
Examples of groundmass
groundmass
The groundmass contains interstitial quartz or tridymite or cristobalite.
From the en.wikipedia.org
The most important criterion is the phenocryst species, followed by the groundmass mineralogy.
From the en.wikipedia.org
Aphanites are commonly porphyritic, having large crystals embedded in the fine groundmass or matrix.
From the en.wikipedia.org
For comparison, Raman spectra of these high-P phases were plotted with the low-pressure ones from the groundmass.
From the nature.com
Their most characteristic feature is the presence of equant megacrysts of plagioclase surrounded by a fine-grained mafic groundmass.
From the en.wikipedia.org
Higher iron and magnesium tends to manifest as a darker groundmass, and also occasionally amphibole or pyroxenephenocrysts.
From the en.wikipedia.org
The centre of a lava flow is commonly massive and crystalline, flow banded or layered, with microscopic groundmass crystals.
From the en.wikipedia.org
Minerals such as alkali feldspar, leucite, nepheline, sodalite, phlogopite mica, and apatite may be present in the groundmass.
From the en.wikipedia.org
Porphyry is a variety of igneousrock consisting of large-grained crystals, such as feldspar or quartz, dispersed in a fine-grained feldspathicmatrix or groundmass.
From the en.wikipedia.org
- (geology) the matrix of fine-grained crystalline material in which larger crystals are embedded
- This includes the clay micromass and any fine-grained silty fraction.
- A term sometimes used for the matrix of a sedimentary rock.
