| Mineralogy (%) | Sample AR | Sample BO | Sample TM | |
| Whole rock sample (%) | Clay minerals | 50 | 50 | 45 |
| Quartz | 25 | 15 | 30 | |
| Calcite | 17 | 25 | 05 | |
| Feldspar | 08 | 10 | 00 | |
| Dolomite | 00 | 00 | 10 | |
| Gypsum | 00 | 00 | 10 | |
| <2 µm fraction | Illite | 65 | 55 | 40 |
| Illite/Smectite | 20 | 20 | 00 | |
| Kaolinite | 15 | 15 | 50 | |
| Chlorite | 00 | 10 | 10 | |