Tanzanite
gem · uncommon
Quick facts
- Formula
- (Ca2Al3(SiO4)3(OH))
- Hardness
- 6-7
- Luster
- Vitreous
- Colors
- Blue, violet, purple
Tanzanite is a blue-violet variety of the mineral zoisite and is found only in Tanzania. It is prized for its striking color and is often heat-treated to enhance its hue.
Look for its trichroic nature, showing different colors when viewed from different angles.
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