| Sample code | FRO | GOU | MAM | DJO |
| SiO2 | 47.1 | 58.5 | 49.3 | 72.8 |
| Al2O3 | 22.8 | 19.9 | 16.4 | 10.9 |
| Fe2O3 | 13.2 | 10.2 | 12.0 | 6.4 |
| CaO | 6.3 | 0.2 | 5.7 | 0.5 |
| MgO | 2.0 | 0.5 | 3.1 | 0.3 |
| Na2O | 0.6 | 3.2 | 2.7 | 0.8 |
| K2O | 1.9 | 2.4 | 0.5 | 3.0 |
| TiO2 | 0.1 | 0.3 | 1.4 | 0.5 |
| MnO | 0.0 | 0.1 | 0.2 | 0.1 |
| P2O5 | 0.0 | 0.2 | 0.1 | 00 |
| LOI | 5.8 | 3.6 | 8.3 | 4.5 |
| Total | 100 | 99.0 | 99.7 | 99.8 |
| SiO2/Al2O3 | 2.1 | 2.9 | 3.0 | 6.7 |
| CIA | 72.0 | 77.4 | 64.9 | 72.2 |