Melilite Bindi L, Bonazzi P Physics and Chemistry of Minerals 32 (2005) 89-96 Incommensurate-normal phase transition in natural melilite: an in situ high-temperature X-ray single-crystal study Sample: San Venanzo, Italy; T = 513 K Note: xO1 and yO1 corrected by authors _database_code_amcsd 0008959 7.852 7.852 5.019 90 90 90 P-42_1m atom x y z occ Uiso CaX .3319 .1681 .5055 .935 .0429 NaX .3319 .1681 .5055 .05 .0429 SrX .3319 .1681 .5055 .01 .0429 KX .3319 .1681 .5055 .01 .0429 MgT1 0 0 0 .96 .0326 AlT1 0 0 0 .07 .0326 SiT2 .1399 .3601 .9352 .99 .0318 AlT2 .1399 .3601 .9352 .01 .0318 O1 .5 0 .1831 .0446 O2 .1408 .3592 .2542 .0484 O3 .0805 .1866 .7861 .0450