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: SZIPPNH4I
_database_code_amcsd 0005849
8.6987 14.166 17.847 90 104.117 90 C2/m
atom         x     y      z Uiso
U(1)     .6663 .2319  .3347 .011
U(2)     .3339 .2681  .1654 .011
S(1)         0 .2549      0 .020
S(2)         0 .2361    1/2 .007
NH4(1)   .7250   1/2  .5051 .029
NH4(2)   .3040     0  .0118 .026
NH4(3)   .5490     0  .1598 .036
NH4(4)   .4490   1/2  .3265 .022
O(1)    -.1139 .1755  .4461 .012
O(2)    -.1234 .3177 -.0481 .024
O(3)     .4020 .2433  .2947 .018
O(4)    -.0690 .1929  .0488 .021
O(5)    -.0771 .2973  .5474 .015
O(6)     .6000 .2395  .2053 .008
O(7)     .6560 .1050  .3197 .021
O(8)     .3530 .3950  .1786 .019
O(9)     .3090 .1461  .1381 .021
O(10)    .6830 .3549  .3581 .021
Wat(11)  .9370   1/2  .4011 .033