K(NpO2)(PO4)(H2O)3
Forbes T Z, Burns P C
The Canadian Mineralogist 45 (2007) 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
_database_code_amcsd 0006146
6.9564 6.9564 17.826 90 90 90 *P4/ncc
.25 -.25 0
atom     x     y     z occ Uiso
K    .8420 .0310 .4183 .25 .062
Np     .25   .25 .2983     .017
P      .75   .25   .25     .018
O1     .25   .25 .3954     .025
O2     .25   .25 .1993     .028
O3   .6840 .0230 .4418     .044
Wat4 .7774 .0755 .1982 .75 .025