AM_Na24K216Al24Ge24O96_40H2O Formula: Na.1 K.9 Al Ge O5.666 H4 Name: Na2.4K21.6Al24Ge24O96*40H2O Unit cell: 14.42 9.87 23.33 90.0 105.92 90.0 , V=3193.10 Space group: C12/C1 (15)

Celestian A J , Parise J B , Goodell C , Tripathi A , Hanson J , Chemistry of Materials , 16 (2004) p.2244-2254, Time-resolved diffraction studies of ion exchange: K(+) and Na(+) exchange into, (Al,Ge) gismondine (GIS)Na24Al24Ge24O96*40(H2O) and K8Al8Ge8O32*8(H2O)