• SUNSTONE

    Sunstone’s phenomenal varieties show a distinct and lively glitter called aventurescence.

     

    • Mineral: Feldspar
    • Chemical composition:
      Orthoclase – KAlSi3O8
      Oligoclase and labradorite – solid solution between NaAlSi3O8 and CaAl2Si2O8
    • Color: Yellow, green, red, red-brown, colorless
    • Refractive Index:
      Orthoclase Sunstone – 1.518 to 1.526
      Oligoclase Sunstone – 1.537 to 1.547
      Labradorite Sunstone – 1.559 to 1.568
    • Birefringence:
      Orthoclase – 0.005 to 0.008
      Oligoclase and labradorite – 0.007 to 0.010
    • Specific gravity:
      Orthoclase – 2.58
      Oligoclase – 2.65
      Labradorite – 2.70
    • Mohs hardness: 6.0 – 7.2

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