NH4Cr(SO4)2*12H2O
Rempfer N, Lerner H W, Bolte M
Acta Crystallographica E60 (2004) i80-i81
The ammonium chromium(III) alum NH4Cr(SO4)2*12H2O
12.2491 12.2491 12.2491 90 90 90 Pa3
atom      x      y      z occ   Uiso U(1,1) U(2,2) U(3,3)  U(1,2)  U(1,3)  U(2,3)
N         0     .5     .5      .0323  .0323  .0323  .0323  -.0160   .0160  -.0160
H1     .012   .544   .553 2/3   .039
Cr       .5     .5     .5     .00994 .00994 .00994 .00994 -.00036 -.00036 -.00036
S    .80864 .69136 .30864     .01273 .01273 .01273 .01273 -.00183  .00183 -.00183
O1   .81058 .73618 .41998      .0252  .0219  .0348  .0190  -.0111   .0042  -.0126
O2   .73931 .76069 .23931      .0340  .0340  .0340  .0340   .0085  -.0085   .0085
O3   .48764 .51483 .34114      .0148  .0197  .0134  .0114   .0013  -.0016  -.0003
H3A   .4708  .5712  .3131       .035
H3B   .4803  .4626  .2983       .036
O4   .04676 .63817 .69723      .0220  .0205  .0188  .0266   .0038   .0060   .0058
H4A   .0075  .6829  .7082       .026
H4B    .104  .6663  .7085       .039