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adularia
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noun (plural: adularias)
  1. A variety of orthoclase feldspar found as colorless to white prismatic crystals in cavities in metamorphic rocks. Some specimens reflect a bluish sheen along crystal faces. This phenomenon is called adularescence, and adularia with this property is called moonstone. (See sanidine).
  • Chemical composition: Potassium aluminum silicate, <math>KAlSi?_3O_8</math>
  • Physical properties:
    Moh's Hardness: 6.0
     Specific gravity: 2.6
    Color: white, colorless
     Luster: glassy
    Fracture: conchoidal
     Habit: prismatic.
Translations:
  • Spanish: adularia
Etymology: :Named for the type locality at Adular, Switzerland.

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