Gemstone Characteristics
Tanzanite

Chemical Composition:
Ca2 Al3 (Si O4)3 (OH)
Hardness: 6 - 7
Refractive Index: 1.69 - 1.70
Specific Gravity: 3.35
Lustre: Vitreous.
Locations Where Found:
Tanzania.
Colours: Blue, Violet.

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