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 = 450 C _database_code_amcsd 0008462 4.8168 10.4029 6.0800 90 90 90 Pbnm atom x y z occ Uiso FeM1 0 0 0 .515 .01354 MgM1 0 0 0 .485 .01354 FeM2 .9917 .2787 .25 .485 .01127 MgM2 .9917 .2787 .25 .515 .01127 Si .4246 .0972 .25 .00623 O1 .7678 .0922 .25 .0176 O2 .2174 .4522 .25 .01149 O3 .2826 .1633 .0354 .01172