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Oval Tanzanite
Oval Tanzanite - Blue Gem Variety of Zoisite

Zoisite
Zoisite was a minor gemstone until the discovery in 1967 of Tanzanite, an attractive purple-blue variety. There is a rose red variety known as thulite which comes from Norway, and a green variety from Tanzania which contains large opaque ruby crystals.

Colour:
Rose red, green, and blue or purple (tanzanite).

Chemical Composition and NameCa2Al2(AlOH)(SiO4)3 - Hydrous Calcium Aluminium Silicate
Hardness6.0 - 6.5
Refractive Index1.700 to 1.706
Specific Gravity3.25 - 3.37
Crystalline SystemRhombic


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