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 = 101
_database_code_amcsd 0004642
12.1736 12.1736 7.5757 90 90 90 I4/m
atom     x     y     z  occ  Uiso
CaM  .3579 .2844     0 .794  .033
NaM  .3579 .2844     0 .206  .033
SiTl .1621 .0911     0  .75  .017
AlTl .1621 .0911     0  .25  .017
SiT2 .1593 .4134 .2071  .54 .0132
AlT2 .1593 .4134 .2071  .46 .0132
CA      .5    .5     0 .834  .016
SA      .5    .5     0 .146  .016
O1   .0406 .1488     0       .016
O2   .1856 .3755     0       .024
O3   .4508 .1504 .2083       .031
O4   .2661 .3674 .6713       .027
O5S  .3791 .5738 .1065 .073  .095
O6C  .6003 .5113     0 .625  .095