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Examples ofphenocryst
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The proportions of the clinopyroxene existing asphenocrystversus groundmass phases are highly variable.
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Conversely, distinctive lithological sequence characteristics can be locally mapped, together with variations inphenocrystassemblages in associated ignimbrites.
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The basalts are generally porphyritic, andphenocrystassemblages show a gradual change from olivine to olivine-clinopyroxene-oxides and olivine-clinopyroxene-plagioclase.
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Most of the tuffs are also zoned with respect tophenocrystproportions:phenocryst-poor bases grade to tops with more phenocrysts (as much as 20 %).
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These show no evidence for relict vesicular texture and have a crystal (phenocryst) content comparable to that of the rock as a whole.
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Figure 6c shows a fine-grained albite-sericite aggregate, which appears to be pseudomorphous after a primary plagioclasephenocryst.
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Plagioclase is labradorite (phenocryst) and oligoclase (matrix) and has been variably sericitized.
From theCambridge English Corpus
Clinopyroxene (30-40 vol. % of the rock) is also abundant both as aphenocrystand as a groundmass phase.
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Clinopyroxene is also abundant as aphenocrystphase, and is common in the groundmass.
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No olivine was identified in the groundmass or as aphenocrystphase.
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There is no obvious horizontal variation in the composition of the basalts; however, within-flow vertical variation, represented by change inphenocrysttypes and proportions, is recorded.
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Banded pumice occurs in most units of the third (youngest) explosive cycle, and ignimbrites typically contain mixedphenocrystassemblages, indicating the role of magma mixing/mingling prior to eruption.
From theCambridge English Corpus
Aphenocrystis a relatively large and usually conspicuous crystal distinctly larger than the grains of the rock groundmass of an igneous rock.
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This example is from Wikipedia and may be reused under a CC BY-SA license.These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.
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