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: UBC refinement _database_code_amcsd 0005381 8.560 8.560 20.190 90 90 120 P31c atom x y z occ Uiso Pb .2919 .2586 0 .012 Ca 0 0 .1465 .022 Al1 2/3 1/3 .4852 .97 .010 Fe1 2/3 1/3 .4852 .03 .010 Al2 1/3 2/3 .3678 .004 Si1 2/3 1/3 .1339 .013 Si2 0 0 .3731 .016 Si3 2/3 1/3 .2889 .013 Si4 1/3 2/3 .2022 .016 Si5 .3871 .0591 .3782 .018 Si6 .0618 .4121 .0982 .019 O1 1/3 2/3 .280 .018 O2 2/3 1/3 .214 .034 O3 0 0 .456 .041 O4 .145 .501 .172 .026 O5 .489 .156 .107 .024 O6 .512 .137 .316 .023 O7 .134 .571 .043 .020 O8 .197 .035 .346 .036 O9 .087 .241 .075 .024 Wat10 .229 .197 .221 .045 O11 .453 .214 .435 .015 O12 .505 .644 .400 .011