definition of the word adularia

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Adularia

Wikipedia

Named for the type locality at Adular, Switzerland.

adularia (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, KAlSi₃O₈

• Physical properties:
  • Moh's Hardness: 6.0
  • Specific gravity: 2.6
  • Color: white, colorless
  • Luster: glassy
  • Fracture: conchoidal
  • Habit: prismatic.

• rock
• mineral
• gemstone

Definition from Wiktionary Content avaible with GNU Free Documentation License

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