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 = 494 _database_code_amcsd 0004646 12.2192 12.2192 7.5792 90 90 90 I4/m atom x y z occ Uiso CaM .3578 .2851 0 .794 .048 NaM .3578 .2851 0 .206 .048 SiTl .1624 .0893 0 .75 .023 AlTl .1624 .0893 0 .25 .023 SiT2 .1594 .4146 .2070 .54 .0174 AlT2 .1594 .4146 .2070 .46 .0174 CA .5 .5 0 .834 .027 SA .5 .5 0 .146 .027 O1 .0411 .1474 0 .028 O2 .1857 .3788 0 .037 O3 .4505 .1497 .2108 .046 O4 .2665 .3699 .6702 .034 O5S .3703 .5784 .1103 .073 .118 O6C .5992 .5092 0 .625 .118