Ca2(Mg.55Fe.45)Si2O7 Kusaka K, Hagiya K, Ohmasa M, Okano Y, Mukai M, Iishi K, Haga N Physics and Chemistry of Minerals 28 (2001) 150-166 Determination of structures of Ca2CoSi2O7, Ca2MgSi2O7, and Ca2(Mg.55Fe.45)Si2O7 in incommensurate and normal phases and observation of diffuse streaks at high temperature Sample: T = 673 K Melilite group _database_code_amcsd 0008531 7.8958 7.8958 5.0223 90 90 90 P-42_1m atom x y z occ Biso Mg 0 0 0 .55 1.84 Fe 0 0 0 .45 1.84 Ca .3313 .1687 .5059 2.34 Si .1385 .3615 .9377 1.34 O1 0 .5 .825 3.3 O2 .1393 .3607 .2556 2.9 O3 .0813 .1897 .7889 2.9