Thulite
is the pink to reddish variety of the mineral Zoisite. It is an opaque stone composed of dense crystals, and is used as a minor gemstone.
| Chemical Formula | Ca2Al3(SiO4)3(OH) |
| Color | Red, Pink |
| 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 |
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