16.6.1.9: Sardonyx

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May 6, 2022
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- 16.6.1.8: Sard
- 16.6.1.10: Tigereye

gemology
Gemology Project

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Sardonyx
Chemical composition	SiO₂ Silicon dioxide
Crystal system	Trigonal
Habit	(edit me)
Cleavage	Poor
Fracture	Very brittle, conchoidal
Hardness	7
Optic nature	(edit me)
Refractive index	1.544 - 1.553
Birefringence	0.009
Dispersion	0.013
Specific gravity	2.65
Lustre	Vitreous
Pleochroism	None

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