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Meaning of orthoclase

or•tho•clase

Pronunciation: (ôr'thu-klās", -klāz"), [key]
— n.
  1. a common white or pink mineral of the feldspar group, KAlSiO, having two good cleavages at right angles, and found in silica-rich igneous rocks: used in the manufacture of porcelain.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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