Eudidymite
Ito T
American Mineralogist 32 (1947) 442-453
The structure of eudidymite (HNaBeSi3O8)
Note: this structure does not make any sense
_database_code_amcsd 0000043
12.62 7.37 13.99 90 103.72 90 C2/c
atom    x    y    z
Na1     0 .030  .25
Na2    .5 .030  .25
Be   .427 .130 .320
Si1  .063 .415 .312
Si2  .563 .415 .312
Si3  .241 .122 .243
O1   .052 .030 .396
O2   .552 .030 .396
O3      0 .275  .25
O4     .5 .275  .25
O5   .161 .030 .190
O6   .661 .030 .190
O7   .208 .315 .372
O8   .708 .315 .372
OH   .303 .190 .494