noun
EXAMPLES FROM CORPUS
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Ankerite, haematite, mica and feldspar have also been identified in smaller quantities.
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Electron microprobe element maps show the distribution and quantity of alkali feldspar in the fine-grained groundmass of the altered basalts.
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Finally, a temperature is reached when a third mineral, feldspar , joins in.
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If feldspar is present, it is in minor volumes or traces.
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Petrological observations show excess feldspar in many basaltic lavas which is most easily explained by crystal settling.
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Quartz, feldspar , and the clay minerals make up the bulk of that contribution.
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They contain large amounts of the feldspar mineral.