Definitions
sanidine Tweet Definition of sanidine Like Definition of sanidine on Facebook
noun 
  1. (mineralogy) A variety of orthoclase feldspar found as tabular crystals embedded in volcanic rocks. It sometimes reflects a blue sheen along crystal planes. This phenomenon is called adularescence, and sanidine with this property is called moonstone.
  • Chemical composition: Potassium aluminum silicate, <math>KAlSi?_3O_8</math>
  • Physical properties:
    Moh's Hardness: 6.0
    Specific gravity: 2.6
    Color: white, flesh, yellow, pink
    Luster: glassy
    Fracture: conchoidal
    Habit: tabular. Well developed crystal faces are often highly reflective.
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