Zoisite occurs in a number of varieties. However, the most sought-after is tanzanite. It is a type of zoisite that is sapphire-blue due to the presence of vanadium. A massive green variety of zoisite, containing rubies and occasionally dark hornblende inclusions, may be polished, carved, or tumbled to make ornaments or an attractive stone. Some heating of zoisite varieties may enhance their color.
Polished zoisite is often used for decorative work. It was discovered by Baron von Zois in the Sau-Alp Mountains of Austria. Zoisite was first called saualpite.
Occurrence
Yellow and green zoisite occurs in Tanzania and Kenya.
Zoisite Properties
- Specific Gravity: 3.35
- Refractive Index: 1.69-1.70
- Birefringence (DR): 0.010
- Luster: Vitreous
- Crystal Structure: Orthorhombic
- Composition: Calcium aluminum hydroxysilicate
- Hardness: 6½
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