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 = 503 K Melilite group _database_code_amcsd 0008527 7.8868 7.8868 5.0171 90 90 90 P-42_1m atom x y z occ Biso Mg 0 0 0 .55 1.30 Fe 0 0 0 .45 1.30 Ca .33118 .16882 .5060 2.03 Si .1386 .3614 .9369 1.05 O1 0 .5 .824 3.1 O2 .1395 .3605 .2561 2.56 O3 .0806 .1891 .7885 2.8