Thoreaulite
Mumme W G
American Mineralogist 55 (1970) 367-377
The crystal structure of SnTa2O7, thoreaulite, an example of tin in five-fold
coordination
_database_code_amcsd 0000199
17.140 4.865 5.548 90 91.0 90 C2/c
atom     x     y     z Biso
Sn       0 .2300   .25  1.2
Ta   .1698 .2403 .6675   .9
O1       0  .392   .75  3.6
O2    .075  .097  .599  2.6
O3    .124  .567  .427  3.6
O4    .217  .077  .342  3.5