Montmorillonite Gournis D, Lappas A, Karakassides M A, Tobbens D, Moukarika A Physics and Chemistry of Minerals 35 (2008) 49-58 A neutron diffraction study of alkali cation migration in montmorillonites Sample: Cs-mont-300 _database_code_amcsd 0009129 5.191 8.976 11.32 90 100.56 90 C2/m atom x y z occ Si1 .153 .171 .305 .975 Al1 .153 .171 .305 .025 Cs 0 .5 0 .08 Al2 0 .369 .5 .38 Fe2 0 .369 .5 .05 Mg2 0 .369 .5 .07 O1 .278 0 .287 .50 O2 .406 .240 .247 O3 .188 .238 .440 OH .660 0 .415 .50