AM_NH4(NpO2)(PO4)(H2O)3
Formula: N Np P O9 H4
Name: NH4(NpO2)(PO4)(H2O)3
Unit cell: 6.9843 6.9843 18.023 90.0 90.0 90.0 , V=879.17
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: NH4P1