| Name | Fossilized Wood |
| Class | Silicates |
| Category | Microcrystalline quartz |
| Crystal system | Trigonal |
| Chemical composition | Silicon dioxide (SiO₂), slowly replacing organic fibers |
| Hardness (Mohs scale) | 6.5 to 7 |
| Transparency | Opaque |
| Geographical origin | United States (Arizona), Madagascar, Indonesia, Argentina, Australia |






















































































































































































































