noun (plural: adularias)
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).
Etymology: :Named for the type locality at Adular, Switzerland.
Chemical composition: Potassium aluminum silicate, <math>KAlSi?_3O_8</math>
Moh's Hardness: 6.0
Specific gravity: 2.6
Color: white, colorless
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