| Name | Chalcedony |
| Class | Semi-precious |
| Category | Microcrystalline quartz |
| Crystal system | Trigonal |
| Chemical composition | Silicon dioxide (SiO₂) |
| Hardness (Mohs scale) | 6.5 to 7 |
| Transparency | Translucent |
| Geographical origin | Brazil, India, Madagascar, United States, Turkey, Namibia |






















































































































































































































