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16.07: Zoisite

Last updated

May 6, 2022
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- 16.6.1.10: Tigereye
- 16.7.1: Tanzanite

gemology
Gemology Project

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Zoisite
Chemical composition	Calcium aluminum silicate
Crystal system	Orthorhombic
Habit	Prismatic and massive
Cleavage	Perfect, prismatic
Fracture	Uneven
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
Pleochroism	Strong in blue

Figure $\PageIndex{1}$ : Zoisite with ruby bead

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