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 _database_code_amcsd 0009127 5.181 8.945 12.34 90 99.62 90 C2/m atom x y z occ Si1 .140 .171 .302 .975 Al1 .140 .171 .302 .025 Cs 0 .5 0 .08 Al2 0 .374 .5 .38 Fe2 0 .374 .5 .05 Mg2 0 .374 .5 .07 O1 .217 0 .271 .50 O2 .397 .218 .248 O3 .199 .229 .430 OH .628 0 .392 .50