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Moonstone is a birthstone for June, along with pearl and alexandrite. Moonstone is also the gemstone for the 3 year wedding anniversary.
- COLOR: Colorless to White, Gray, Green, Peach, Brown
- REFRACTIVE INDEX: 1.518 to 1.526
- BIREFRINGENCE: 0.05 to 0.008
- SPECIFIC GRAVITY: 2.58
- MOHS HARDNESS: 6.0 to 6.5