Definition of alkali feldspar in English:

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alkali feldspar

noun

Geology
Any of the group of feldspars rich in sodium and/or potassium.
Example sentences
  • Olson states that the first mineral to be deposited was a reddish alkali feldspar, followed by abundant deposition of epidote and smaller amounts of pumpellyite.
  • Of these, alkali feldspar, particularly orthoclase, is the most common.
  • The first phase of diagenetic albite constitutes an impure, turbid variety including albitized grains of original plagioclase and alkali feldspar.

For editors and proofreaders

Syllabification: al·ka·li feld·spar

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