Ba.29Mn2O4*.888H2O Lopano C L, Heaney P J, Post J E, Hanson J, Komarneni S American Mineralogist 92 (2007) 380-387 Time-resolved structural analysis of K-and Ba-exchange reactions with synthetic Na-birnessite using synchrotron X-ray diffraction Locality: synthetic Sample: Ba-birnessite _database_code_amcsd 0004278 5.1711 2.8476 7.3076 89.516 102.957 89.897 C-1 atom x y z occ Uiso Ba .5830 .2093 .5069 .0725 .1000 Mn 0 0 0 .0018 O .3777 -.0301 .1321 .0170 Wat .5830 .2093 .5069 .222 .1000