Rollandite
Sarp H, Cerny R
European Journal of Mineralogy 12 (2000) 1045-1050
Rollandite, Cu3(AsO4)2.4H2O, a new mineral: its description and crystal structure
_database_code_amcsd 0006846
5.6906 17.061 9.732 90 90 90 Pnma
atom     x      y      z  Uiso
Cu1  .4264 .51379  .3510 .0099
Cu2  .0230    1/4  .2214 .0072
As   .3649 .10323 .10043 .0061
O1    .019  .1463  .5231  .013
O2    .024  .0351  .3188  .009
O3    .116  .0611  .0365  .010
Wat4  .275  .5962  .2386  .011
O5    .280  .1745  .2150  .008
Wat6  .214    1/4   .823  .025
Wat7  .360    1/4  .4847  .011