Perthite

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What Wikipedia says

Perthite or perthitic texture is used to describe an intergrowth of two feldspars: a host grain of potassium-rich alkali feldspar (near K-feldspar, KAlSi3O8, in composition) includes exsolved lamellae or irregular intergrowths of sodic alkali feldspar (near albite, NaAlSi3O8, in composition).

Excerpt from the Wikipedia article “Perthite”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Jstuby at English Wikipedia, Public domain, via Wikimedia Commons.