Sodium alum Cromer D T, Kay M I, Larson A C Acta Crystallographica 22 (1967) 182-187 Refinement of the alum structures. II. X-ray and neutron diffraction of NaAl(SO4)2*12H2O, gamma alum Locality: synthetic _database_code_amcsd 0009306 12.213 12.213 12.213 90 90 90 Pa3 atom x y z Biso B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3) Na .5 .5 .5 .00412 .00412 .00412 -.00030 -.00030 -.00030 Al 0 0 0 .00284 .00284 .00284 .00050 .00050 .00050 S .2652 .2652 .2652 .00397 .00397 .00397 .00044 .00044 .00044 OSl .3343 .3343 .3343 .00687 .00687 .00687 -.00291 -.00291 -.00291 OS2 .2957 .2783 .1508 .01417 .00724 .00535 -.00987 .00733 -.00168 Ow3 .0767 .0403 .3188 .00619 .00591 .00419 -.00367 .00048 .00110 Ow4 .1371 .9596 .0573 .00338 .00438 .00498 .00077 -.00097 .00173 H1 .585 .319 .378 3.4 H2 .486 .308 .383 4.0 H3 .555 .202 .502 3.2 H4 .588 .339 .113 2.4