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