- (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
Habit: tabular. Well developed crystal faces are often highly reflective.
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