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 = 900
_database_code_amcsd 0004650
12.2778 12.2778 7.5861 90 90 90 I4/m
atom     x     y     z  occ Uiso
CaM  .3556 .2858     0 .794 .061
NaM  .3556 .2858     0 .206 .061
SiTl .1608 .0875     0      .027
SiT2 .1580 .4171 .2055  .49 .027
AlT2 .1580 .4171 .2055  .51 .027
CA      .5    .5     0 .834 .052
SA      .5    .5     0 .146 .052
O1   .0436 .1478     0      .035
O2   .1896 .3804     0      .039
O3   .4492 .1482 .2186      .051
O4   .2658 .3731 .6619      .053
O5S  .4143 .5020 .2041 .073 .182
O6C  .6026 .4982     0 .625 .182