16.6.1.8: Sard

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May 6, 2022
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- 16.6.1.7: Onyx
- 16.6.1.9: Sardonyx

gemology
Gemology Project

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Agate
Chemical composition	SiO₂ Silicon dioxide
Crystal system	Trigonal
Habit	Aggregate
Fracture	Conchoidal
Hardness	6.5-7
Refractive index	± 1.54
Specific gravity	2.60
Lustre	Vitreous

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