Thulite
Thulite Gemstones by Colour
This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
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| General Information | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A variety or type of: | Zoisite | |||||||||||||||||||||
| Chemical Formula |
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| Physical Properties of Thulite | ||||||||||||||||||||||
| Mohs Hardness | 6 to 7, Blue Chart Gem Identification (2010) More from other references | |||||||||||||||||||||
| Specific Gravity | 3.1, Gemstones (2009) | |||||||||||||||||||||
| Cleavage Quality | Perfect, Gemmological Tables (2004) | |||||||||||||||||||||
| Fracture | Conchoidal, Gemstones (2009) | |||||||||||||||||||||
| Optical Properties of Thulite | ||||||||||||||||||||||
| Refractive Index | 1.695(+/-), Blue Chart Gem Identification (2010) More from other references | |||||||||||||||||||||
| Optical Character | Biaxial/+, Blue Chart Gem Identification (2010) | |||||||||||||||||||||
| Birefringence | 0.006 to 0.013, Blue Chart Gem Identification (2010) | |||||||||||||||||||||
| Colour | ||||||||||||||||||||||
| Colour (General) | Pink to red variety of zoisite, often mottled white and gray, Blue Chart Gem Identification (2010) | |||||||||||||||||||||
| Causes of Colour | Pink, Mn3+ in presumably octahedral coordination, Pragmatic Spectroscopy For Gemologists (2011) | |||||||||||||||||||||
| Transparency | Opaque, Blue Chart Gem Identification (2010) | |||||||||||||||||||||
| Crystallography of Thulite | ||||||||||||||||||||||
| Crystal System | Orthorhombic, Blue Chart Gem Identification (2010) | |||||||||||||||||||||
| Habit | Massive, Gemstones (2009) | |||||||||||||||||||||
| Further Information | ||||||||||||||||||||||
| Mineral information: | Thulite information at mindat.org | |||||||||||||||||||||