Akermanite Kusaka K, Ohmasa M, Hagiya K, Iishi K, Haga N Mineralogical Journal 20 (1998) 47-58 On variety of the Ca coordination in the incommensurate structure of synthetic iron-bearing akermanite, Ca2(Mg0.55,Fe0.45)Si2O7 Note: Sample is synthetic, this is the structure obtained from a standard refinement _database_code_amcsd 0014431 7.8679 7.8679 5.0144 90 90 90 P-42_1m atom x y z occ Biso B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3) Ca .3307 .1693 .5061 1.914 .00980 .00980 .0088 .0065 .0008 -.0008 Mg 0 0 0 .554 1.00 .00404 .00404 .0099 0 0 0 Fe 0 0 0 .446 1.00 .00404 .00404 .0099 0 0 0 Si .1384 .3616 .9383 0.88 .00395 .00395 .0067 .0009 .00095 -.00095 O1 0 .5 .825 3.51 .0202 .0202 .005 .016 0 0 O2 .1390 .3610 .2570 2.25 .0125 .0125 .0055 .008 .00025 -.00025 O3 .0795 .1898 .7891 2.97 .0243 .0058 .0143 -.0055 .009 -.0025