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Definition of alkali feldspar in English: alkali feldsparnoun Geology Any of the group of feldspars rich in sodium and/or potassium. Example sentencesExamples - The first phase of diagenetic albite constitutes an impure, turbid variety including albitized grains of original plagioclase and alkali feldspar.
- Of these, alkali feldspar, particularly orthoclase, is the most common.
- 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.
- On the other hand, the mogila granite had a darker mineral texture, a greater content of the mineral plagioclase, and large pink crystals of alkali feldspar up to 1.5 inches in length to 0.5 inches in width.
- Closer to the contact microcline is replaced by sanidine, and perthitic exsolution in detrital alkali feldspar begins to disappear.
Definition of alkali feldspar in US English: alkali feldsparnoun Geology Any of the group of feldspars rich in sodium and/or potassium. Example sentencesExamples - 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.
- On the other hand, the mogila granite had a darker mineral texture, a greater content of the mineral plagioclase, and large pink crystals of alkali feldspar up to 1.5 inches in length to 0.5 inches in width.
- Closer to the contact microcline is replaced by sanidine, and perthitic exsolution in detrital alkali feldspar begins to disappear.
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