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definition of the word orthoclase

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ortho (from Greek orthos, straight, perpendicular) + clase (from Greek klastos, broken, to break).


  1. (mineralogy) Potassium aluminum silicate, KAlSi3O8, a common feldspar of igneous, plutonic, and metamorphic rocks. Orthoclase is the main feldspar of pegmatite occurrences, where it is most commonly flesh-colored. Orthoclase is used in the ceramic and glass industries and as a decorative gravel.

See rock, mineral, pegmatite
See Sanidine, Adularia

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