The Atterberg plastic limits of the common pure clay minerals are presented. The data obtained indicate that the plastic limit of attapulgite >montmorillonite >illite >kaolinite; that the liquid limit of sodium montmorillonite>calcium montmorillonite = attapulgite >illite >kaolinite; and that the plastic index of sodium montmorillonite >calcium montmorillonite>attapulgite>illite>kaolinite. The data show also that all the Atterberg limits increase with decreasing particle size.

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