Zoisite
is a mineral that includes several gem varieties. The most important and well-known is Tanzanite, a sensational blue gemstone. The variety Thulite is used as a minor pink gemstone. A variety known as Ruby Zoisite, which is green Zoisite associated with opaque red Ruby (and often black amphibole streaks), is used as a carving gemstone as well as a minor gem. The term Zoisite is rarely used on its own in the gemstone trade.Tanzanite and Thulite each have their own dedicated page.
| Chemical Formula | Ca2Al3(SiO4)3(OH) |
| Color | Blue, Red, Green, Pink, Purple |
| Hardness | 6Â -Â 6.5 |
| Crystal System | Orthorhombic |
| Refractive Index | 1.69Â -Â 1.70 |
| SG | 3.2Â -Â 3.4 |
| Transparency | Opaque. May be translucent in thin backlit sections. |
| Double Refraction | .009 |
| Luster | Vitreous |
| Cleavage | 1,1 |
| Mineral Class | Zoisite |
is a mineral that includes several gem varieties. The most important and well-known is Tanzanite, a sensational blue gemstone. The variety Thulite is used as a minor pink gemstone. A variety known as Ruby Zoisite, which is green Zoisite associated with opaque red Ruby (and often black amphibole streaks), is used as a carving gemstone as well as a minor gem. The term Zoisite is rarely used on its own in the gemstone trade.Tanzanite and Thulite each have their own dedicated page. 
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