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Noun: orthoclase  'or-thow,kleys or 'or-thu,kleyz [N. Amer], 'or-thu,kleyz [Brit]
  1. A white or coloured monoclinic feldspar
    "Orthoclase is often found in granite and gives it a pinkish hue"

Derived forms: orthoclases

Type of: feldspar, felspar

Encyclopedia: Orthoclase