Forsterite Redfern S A T, Artioli G, Rinaldi R, Henderson C M B, Knight K S, Wood B J Physics and Chemistry of Minerals 27 (2000) 630-637 Octahedral cation ordering in olivine at high temperature. II: an in situ neutron powder diffraction study on synthetic MgFeSiO4 (Fa50) Sample: T = 1150 C _database_code_amcsd 0008471 4.8472 10.4955 6.1368 90 90 90 Pbnm atom x y z occ Uiso FeM1 0 0 0 .436 .0196 MgM1 0 0 0 .564 .0196 FeM2 .9794 .2819 .25 .564 .0301 MgM2 .9794 .2819 .25 .436 .0301 Si .4203 .0959 .25 .0180 O1 .7676 .0954 .25 .0242 O2 .2214 .4540 .25 .0283 O3 .2861 .1652 .0392 .0238