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BIRTHSTONES & ANNIVERSARIES
Turquoise is the traditional birthstone for the month of December and the gem of the 11th wedding anniversary.
- CHEMISTRY: CuAl6(PO4)4 (OH)8.5H2O
- REFRACTIVE INDEX: 1.610 to 1.650
- BIREFRINGENCE: Not detectable
- SPECIFIC GRAVITY: 2.76 (+0.14, -0.36)
- MOHS HARDNESS: 5 to 6