| Name | Sardonyx |
| Class | Semi-precious |
| Category | Microcrystalline quartz (variety of chalcedony) |
| Crystal system | Trigonal |
| Chemical composition | SiO₂ (Silicon dioxide) |
| Hardness (Mohs scale) | 6.5 to 7 |
| Transparency | Translucent to opaque |
| Geographical origin | Brazil, India, Uruguay, United States, Germany, Czech Republic |






















































































































































































































