Cation-exchange Capacity - Standard Values

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.

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