Zippeite
Burns P C, Deely K M, Hayden L A
The Canadian Mineralogist 41 (2003) 687-706
The crystal chemistry of the zippeite group
Sample: SZIPPNH4II
_database_code_amcsd 0005850
14.2520 8.7748 17.1863 90 90 90 Cmca
atom       x      y     z Uiso
U(1)   .2325  .1268 .4138 .014
S(1)     1/4  .3812   1/4 .021
O(1)   .2434  .3756 .4552 .037
O(2)   .3086  .4696 .3003 .032
O(3)   .1868  .2814 .2993 .020
O(4)   .1070  .1244 .4313 .029
O(5)   .3527  .1286 .3862 .035
NH4(1)     0  .1350 .2504 .091
NH4(2)     0 -.1650 .4030 .119