Thulite
From Antique Jewelry University
Gemological information
| Gemological Information for Thulite, Zoisite | |
|---|---|
| Color | Pink (Sometimes with White Streaks) |
| Crystal Structure | Orthorhombic |
| Refractive Index | 1.691 to 1.700 |
| Durability | Fair to Poor |
| Hardness | 6 to 7 |
| Similar Stones | Rhodonite, Hydrogrossular Garnet |
| Treatments | None Known |
| Country of Origin | Tanzania, Austria, Germany, Italy, Mexico, Switzerland, U.S. |
| Thulite Care | |
| Ultrasonic Cleaning | Never |
| Steam Cleaning | Never |
| Warm Soapy Water | Safe |
| Chemical Attack | Hydrochloric and Hydrofluoric Acids Attack |
| Light Sensitivity | Stable |
| Heat Sensitivity | Jeweler's Torch may Fuse |
Sources
Gem Reference Guide, Los Angeles: Gemological Institute of America, 1988. Pp. 262-264.
Schumann, Walter. Gemstones of the World, New York: Sterling Publishing, Co., 1977. Pp. 160.