| Clay minerals | % weight of clay minerals before and after purification | |
| Raw | Processed | |
| Kaolinite | 20.02 | 38.53 |
| Muscovite/illites | 15.02 | 25.71 |
| Quartz | 23.84 | 16.74 |
| Microcline | 26.10 | 7.65 |
| Plagioclase albite | 15.02 | 11.36 |
| TOTAL | 100.00 | 99.99 |