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 = 200 C _database_code_amcsd 0008458 4.8065 10.3759 6.0609 90 90 90 Pbnm atom x y z occ Uiso FeM1 0 0 0 .537 .00967 MgM1 0 0 0 .463 .00967 FeM2 .9918 .2788 .25 .463 .00719 MgM2 .9918 .2788 .25 .537 .00719 Si .4251 .0977 .25 .00356 O1 .7680 .0918 .25 .01309 O2 .2174 .4515 .25 .00826 O3 .2826 .1640 .0348 .00847