Montmorillonite is a subclass of smectite, a 2:1 phyllosilicate mineral characterized as having greater than 50% octahedral charge; its cation exchange capacity is due to isomorphous substitution of Mg for Al in the central alumina plane.
Montmorillonit er en underklasse af lermineraler, et 2:1 phyllosilikatmineral der er karakteriseret som at have større end 50% oktaedisk ladning; dets kationudvekslingskapacitet skyldes isomorf substitution af magnesium for aluminium i det centrale aluminiumoxidplan.