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