AM_K(NpO2)(PO4)(H2O)3
Formula: K Np P O9 H8
Name: K(NpO2)(PO4)(H2O)3
Unit cell: 6.9564 6.9564 17.826 90.0 90.0 90.0 , V=862.63
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: KP1