| Name | Dumortierite |
| Class | Borates |
| Category | Mineral |
| Crystal system | Orthorhombic |
| Chemical composition | Aluminum borosilicate (Al₇BO₃(SiO₄)₃O₃) |
| Hardness (Mohs scale) | 7 to 8.5 |
| Transparency | Translucent to opaque |
| Geographical origin | Brazil, Madagascar, France, Russia, United States, Sri Lanka |






















































































































































































































