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  1. A clay type marked by platelet like deposits in the authogenic form. Usually not water sensitive but may have occasional loose attachment to the host grain.
  2. A commonly occurring layered alumino-silicate clay mineral. The layers of a kaolinite mineral are not expandable. The cation exchange capacity and specific surface are in the low range compared to most other common clay minerals. The cation exchange capacity of kaolinite is very pH dependent.