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Sapphire orange
Gemological data
- Chemical formula : Al2 O3
- Hardness (Mohs) : 9
- Density : 4
- Refractive index : ne=1.759-1.761 no=1.767-1.770
- Birefingence : 0.008-0.009
- Crystal system : Rhombohedral - Trigonal
The gallery
Saphir orange - Orange sapphire
