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 = 694
_database_code_amcsd 0004648
12.2475 12.2475 7.5823 90 90 90 I4/m
atom     x     y     z  occ  Uiso
CaM  .3578 .2852     0 .794  .056
NaM  .3578 .2852     0 .206  .056
SiTl .1628 .0886     0  .75  .024
AlTl .1628 .0886     0  .25  .024
SiT2 .1592 .4156 .2067  .54 .0201
AlT2 .1592 .4156 .2067  .46 .0201
CA      .5    .5     0 .834  .035
SA      .5    .5     0 .146  .035
O1   .0413 .1462     0       .036
O2   .1859 .3806     0       .042
O3   .4500 .1494 .2128       .053
O4   .2664 .3714 .6698       .039
O5S  .3687 .5775 .1102 .073  .127
O6C  .5982 .5083     0 .625  .127