| Oxides | Weight (%) | |||
|
| Site 1 | Site 2 | Site 3 | Site 4 |
| SiO2 | 48.66 | 49.23 | 49.12 | 49.02 |
| TiO2 | 2.11 | 2.09 | 2.12 | 2.1 |
| Al2O3 | 15.87 | 15.31 | 15.42 | 15.2 |
| Fe2O3 | 12.03 | 13.07 | 12.98 | 13.05 |
| MnO | 0.21 | 0.23 | 0.23 | 0.25 |
| MgO | 5.56 | 5.05 | 5.32 | 5.24 |
| CaO | 7.21 | 6.31 | 6.15 | 6.2 |
| Na2O | 2.69 | 3.79 | 2.65 | 2.89 |
| K2O | 0.41 | 0.51 | 0.45 | 0.5 |
| P2O5 | 0.31 | 0.35 | 0.36 | 0.36 |
| LOI | 5.02 | 4.15 | 5.25 | 4.32 |
| Total | 100.08 | 100.09 | 100.05 | 99.13 |