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 = 773 K Melilite group _database_code_amcsd 0008532 7.8989 7.8989 5.0237 90 90 90 P-42_1m atom x y z occ Biso Mg 0 0 0 .55 2.98 Fe 0 0 0 .45 2.98 Ca .3308 .1692 .5063 2.72 Si .1380 .362 .9415 1.71 O1 0 .5 .828 3.8 O2 .1384 .3616 .258 3.5 O3 .0807 .1906 .7919 3.7