Sanbornite
Douglass R M
American Mineralogist 43 (1958) 517-536
The crystal structure of sanbornite, BaSi2O5
_database_code_amcsd 0000085
4.63 7.69 13.53 90 90 90 Pcmn
atom    x   y    z
Ba   .287 .25 .045
Si   .363 .05 .317
O1   .480 .25 .348
O2   .146 .06 .220
O3   .228 .97 .416