AM_Birnessite_7 Formula: Mn O4.172 Name: Birnessite Unit cell: 5.1298 2.8445 7.5029 90.12 101.395 89.958 , V=107.32 Space group: C-1 (2)

Lopano C L , Heaney P J , Post J E , American Mineralogist , 94 (2009) p.816-826, Cs-exchange in birnessite: Reaction mechanisms inferred from time-resolved, X-ray diffraction and transmission electron microscopy, Note: Solution concentration 0.01 M, Note: Occupancies of the Oint sites are undetermined, O is used only as a scatterer