AM_Na(NpO2)(PO4)(H2O)3 Formula: Na Np P O9 H16 Name: Na(NpO2)(PO4)(H2O)3 Unit cell: 7.005 7.005 16.986 90.0 90.0 90.0 , V=833.50 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: NaP1