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TANZANITE
Chemical Composition: Calcium aluminium silicate with hydroxyl (OH)
Refractive Index: 1.69 – 1.70
Specific Gravity: 3.15 – 3.38
Crystal System: Orthorhombic
Moh's Hardness: 6 ½
Tanzanite is the transparent blue variety of zoisite and was discovered as a new gem in 1967. Colour ranges between blue to violet. Alternatively zoisites of transparent nature are heat treated to produce the blue violet colour.
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Locality for Tanzanite is Tanzania.
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