AM_Ba29Mn2O4_888H2O Formula: Ba.145 Mn O2.444 H4 Name: Ba.29Mn2O4*.888H2O Unit cell: 5.1711 2.8476 7.3076 89.516 102.957 89.897 , V=104.86 Space group: C-1 (2)

Lopano C L , Heaney P J , Post J E , Hanson J , Komarneni S , American Mineralogist , 92 (2007) p.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