Difference between revisions of "Chalcedony"
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Revision as of 23:47, 13 September 2006
| Chalcedony | |
|---|---|
| Chemical composition | Silicon dioxide SiO2 |
| Crystal system | Trigonal |
| Habit | Aggregate |
| Fracture | Conchoidal |
| Hardness | 6.5-7 |
| Refractive index | 1.535 - 1.539 |
| Specific gravity | 2.60 |
| Lustre | Vitreous |
