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A variety of Anorthite A plagioclase feldspar with an albite : anorthite molar ratio ranging from 30 : 70 to 50 : 50. An intermediate member of the Albite-Anorthite Series. Labradorite can display an iridescent optical effect (or schiller) known as labradorescence. The cause of this optical phenomenon is lamellar structure caused by an exsolution process due to a miscibility gap.

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