| Name | Tourmaline |
| Class | Silicates |
| Category | Mineral |
| Crystal system | Trigonal |
| Chemical composition | Complex: (Na,Ca)(Mg,Fe,Li,Al)₃Al₆(BO₃)₃Si₆O₁₈(OH,F)₄ |
| Hardness (Mohs scale) | 7 to 7.5 |
| Transparency | Transparent to opaque |
| Geographical origin | Brazil, Afghanistan, Madagascar, Mozambique, Nigeria, Sri Lanka, United States |






















































































































































































































