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Tourmaline
Mohs scale
7.0 - 7.5
Specific Gravity
2.85 - 3.35
Refractive Index
1.614 - 1.666
Crystal system
Trigonal
Chemical Composition
Na(Li 1.5Al1.5)Al6(Si6 O18)(BO3)3(OH)3(OH)
Sign of Zodiac (Click on the constellation for more information)