| 800˚C | 850˚C | 900˚C | 950˚C | 1000˚C | 1050˚C | 1100˚C | |
| Meknes clays | |||||||
| M1 | 29.8 | 23.9 | 21.7 | 21.5 | 21.6 | 21.4 | 20.3 |
| M2 | 19.3 | 15.3 | 10.2 | 9.7 | 10.2 | 9.6 | 8.8 |
| M3 | 21.8 | 16.0 | 14.4 | 13.9 | 14.2 | 14.1 | 13.8 |
| M4 | 18.6 | 13.7 | 9.3 | 9.0 | 9.1 | 9.0 | 7.4 |
| M5 | 18.2 | 14.2 | 9.2 | 8.5 | 8.8 | 8.0 | 7.2 |
| M6 | 17.4 | 12.9 | 9.1 | 8.8 | 9.2 | 8.6 | 6.7 |
| Unexploitable Tetouan clays | |||||||
| TN1 | 0 | 0 | 0 | 0 | 3.2 | 3.2 | 3.2 |
| TN2 | 0 | 0 | 3.1 | 3.1 | 3.1 | 3.1 | 6.3 |
| TN3 | 0 | 0 | 3.1 | 3.1 | 3.1 | 3.1 | 3.1 |
| TN4 | 0 | 0 | 2.9 | 2.9 | 2.9 | 2.9 | 2.9 |
| TN5 | 0 | 0 | 0 | 0 | 3.1 | 3.1 | 3.1 |
| TN6 | 0 | 0 | 0 | 0 | 0 | 0 | 3.2 |
| TN7 | 0 | 0 | 0 | 0 | 0 | 3.1 | 3.1 |
| TN8 | 0 | 0 | 0 | 0 | 3.2 | 3.2 | 3.2 |
| TN9 | 0 | 0 | 3 | 3 | 3 | 6.1 | 6.1 |
| Exploitable Tetouan clays | |||||||
| TE1 | 0 | 0 | 3.1 | 3.1 | 3.1 | 3.1 | 6.3 |
| TE2 | 0 | 0 | 3.3 | 3.3 | 3.3 | 3.3 | 3.3 |
| TE3 | 0 | 0 | 3.1 | 3.1 | 3.1 | 3.1 | 6.3 |
| TE4 | 0 | 0 | 3.3 | 3.3 | 3.3 | 3.3 | 3.3 |
| TE5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| TE6 | 0 | 0 | 3.1 | 3.1 | 3.1 | 6.3 | 6.3 |
| TE7 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| TE8 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| TE9 | 0 | 0 | 0 | 0 | 3.1 | 3.1 | 6.3 |