Standard Values
| Kaolinite | 3-15 |
| Halloysite 2H2O | 5-10 |
| Halloysite 4H2O | 40-50 |
| Montmorillonite-group | 70-100 |
| Illite | 10-40 |
| Vermiculite | 100-150 |
| Chlorite | 10-40 |
| Glauconite | 11-20+ |
| Palygorskite-group | 20-30 |
| Allophane | ~70 |
These are the values reported by Carroll (1959) for the cation-exchange capacity of minerals in meq./100g at pH of 7.
Read more about this topic: Cation-exchange Capacity
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