Tanzanite is the blue to violet gem variety of the mineral Zoisite. Since its relatively recent discovery in 1967, it has become a mainstream and popular gemstone, and is used extensively in jewelry. To date, Tanzanite is found only in the Arusha region of the African country of Tanzania, and it was named after its country of origin.
| Chemical Formula | Ca2Al3(SiO4)3(OH) |
| Color | Blue, Purple |
| Hardness | 6Â -Â 6.5 |
| Crystal System | Orthorhombic |
| Refractive Index | 1.69Â -Â 1.70 |
| SG | 3.2Â -Â 3.4 |
| Transparency | Transparent to translucent |
| Double Refraction | .009 |
| Luster | Vitreous |
| Cleavage | 1,1 |
| Mineral Class | Zoisite |
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