Thulite
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Description
A pale to deep pink translucent Zoisite stone in which manganese replaces up to 2 % of the calcium. Thulite was discovered near Telemark, Norway and named for Thule, an old name for Norway. It has been used as a gemstone and often has streaks of gray or white.
Synonyms and Related terms
zoisite; rosaline
Physical and Chemical Properties
- Luster = vitreous
- Fracture = conchoidal to uneven
- Fluorescence = inert
- Pleochroism = present; and possibly dichroism or trichroism depending on color
| Mohs Hardness | 6.0 - 6.5 |
|---|---|
| Density | 3.2-3.4 g/ml |
| Refractive index | 1.691 - 1.700 |
| Birefringence | 0.006 - 0.018 |
Resources and Citations
- Gem Identification Lab Manual, Gemological Institute of America, 2016.
- Wikipedia Thulite Accessed Dec 2022
- Mineralogy Database: Zoisite