Wickenburgite
Lam A E, Groat L A
The Canadian Mineralogist 32 (1994) 525-532
The crystal structure of wickenburgite, Pb3CaAl[AlSi10O27](H2O)3, a sheet
structure
Sample: UMAN refinement
_database_code_amcsd 0005382
8.546 8.546 20.168 90 90 120 P31c
atom      x     y     z occ Uiso
Pb    .2920 .2586     0     .011
Ca        0     0 .1462     .013
Al1     2/3   1/3 .4854 .81 .012
Fe1     2/3   1/3 .4854 .19 .012
Al2     1/3   2/3 .3633     .006
Si1     2/3   1/3 .1306     .007
Si2       0     0 .3749     .010
Si3     2/3   1/3 .2875     .009
Si4     1/3   2/3 .1983     .010
Si5   .3833 .0599 .3760     .009
Si6   .0596 .4139 .0965     .008
O1      1/3   2/3  .278     .013
O2      2/3   1/3  .209     .021
O3        0     0  .455     .008
O4     .150  .493  .169     .020
O5     .487  .159  .105     .015
O6     .519  .135  .314     .012
O7     .126  .569  .041     .010
O8     .191  .031  .347     .018
O9     .083  .243  .075     .007
Wat10  .229  .197  .218     .027
O11    .447  .211  .436     .012
O12    .509  .639  .397     .016