Meionite
Antao S M, Hassan I
American Mineralogist 93 (2008) 1470-1477
Unusual Al-Si ordering in calcic scapolite, Me79.6, with increasing temperature
T = 196
_database_code_amcsd 0004643
12.1834 12.1834 7.5761 90 90 90 I4/m
atom     x     y     z  occ  Uiso
CaM  .3579 .2845     0 .794  .036
NaM  .3579 .2845     0 .206  .036
SiTl .1622 .0906     0  .75  .019
AlTl .1622 .0906     0  .25  .019
SiT2 .1593 .4136 .2070  .54 .0142
AlT2 .1593 .4136 .2070  .46 .0142
CA      .5    .5     0 .834  .020
SA      .5    .5     0 .146  .020
O1   .0406 .1486     0       .019
O2   .1856 .3764     0       .026
O3   .4506 .1503 .2089       .035
O4   .2662 .3681 .6711       .029
O5S  .3761 .5769 .1082 .073  .099
O6C  .5998 .5109     0 .625  .099