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 = 26 C
_database_code_amcsd 0004641
12.1667 12.1667 7.5758 90 90 90 I4/m
atom     x     y     z  occ  Uiso
CaM  .3580 .2843     0 .794 .0295
NaM  .3580 .2843     0 .206 .0295
SiTl .1621 .0913     0  .75  .016
AlTl .1621 .0913     0  .25  .016
SiT2 .1592 .4132 .2070  .54 .0124
AlT2 .1592 .4132 .2070  .46 .0124
CA      .5    .5     0 .834  .013
SA      .5    .5     0 .146  .013
O1   .0405 .1492     0       .015
O2   .1855 .3749     0       .021
O3   .4507 .1507 .2078       .029
O4   .2660 .3670 .6717       .027
O5S  .3836 .5736 .1047 .073  .092
O6C  .6006 .5113     0 .625  .092