AM_Rb(NpO2)(PO4)(H2O)3 Formula: Rb Np P O9 H4 Name: Rb(NpO2)(PO4)(H2O)3 Unit cell: 7.031 7.031 17.87 90.0 90.0 90.0 , V=883.40 Space group: P4/NCC (130)

Forbes T Z , Burns P C , The Canadian Mineralogist , 45 (2007) p.471-477, The crystal structures of X(NpO2)(PO4)(H2O)3 (X = K+, Na+, Rb+, NH4+) and, their relationship to the autunite group, Sample: RbP1