| Chemical composition | |
| Al2O3 | 46.06 |
| Fe2O3 | 23.80 |
| SiO2 | 1.74 |
| TiO2 | 1.74 |
| CaO | 0.06 |
| P2O5 | 0.06 |
| Cr2O3 | 0.18 |
| SO3 | 0.09 |
| MgO | <0.01 |
| Na2O | <0.01 |
| K2O | <0.01 |
| LOI | 25.6 |
| Total | 99.36 |
| Mineralogical composition | |
| Gibbsite | 69.50 |
| Hematite | 23.80 |
| Quartz | 1.74 |
| Anatase | 1.74 |
| Total | 96.78 |