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Definition of Anorthoclase
1. n. A feldspar closely related to orthoclase, but triclinic. It is chiefly a silicate of sodium, potassium, and aluminium. Sp. gr., 2.57 -- 2.60.
Definition of Anorthoclase
1. Noun. (minerology) Any of a group of feldspars being mixed sodium and potassium aluminosilicates. ¹
¹ Source: wiktionary.com