Sard
From The Gemology Project
| 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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