| Chemical composition | Proportion (%) |
| SiO2 | 51.31 |
| Al2O3 | 22.26 |
| CaO | 1.33 |
| MgO | 0.06 |
| Na2O | 2.5 |
| K2O | 1.7 |
| TiO | 1.25 |
| MnO | 0.34 |
| Fe2O3 | 8.00 |
| LOI | 10.00 |