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16.7.2: Thulite

Last updated

May 6, 2022
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- 16.7.1: Tanzanite
- 16.08: Garnet

gemology
Gemology Project

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Thulite
Chemical composition	Calcium aluminum silicate
Crystal system	Orthorhombic
Habit	Massive
Hardness	6.5
Optic nature	Biaxial +
Refractive index	1.685-1.707
Birefringence	0.008
Dispersion	Low, 0.012
Specific gravity	3.35
Lustre	Vitreous

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