AM_Birnessite_8 Formula: Mn O4.212 Name: Birnessite Unit cell: 5.1349 2.8465 7.5135 89.94 101.561 89.997 , V=107.59 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 0.05 M, Note: Occupancies of the Oint sites are undetermined, O is used only as a scatterer