%0 Journal Article %K Manganese oxides %K Birnessite %K NMR %K Paramagnetic %A Kellie A Aldi %A Jordi Cabana %A Paul J Sideris %A Clare P Grey %B American Mineralogist %D 2012 %G eng %P 883-889 %R 10.2138/am.2012.3933 %T Investigation of cation ordering in triclinic sodium birnessite via 23Na MAS NMR spectroscopy %V 97 %8 05/2012