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Meaning of anorthoclase

an•or•tho•clase

Pronunciation: (an-ôr'thu-klās", -klāz"), [key]
— n. Mineral.
  1. a variety of microcline, rich in sodium and sometimes having a play of color: sometimes considered a variety of orthoclase.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.