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 = 850 C _database_code_amcsd 0008468 4.8341 10.4515 6.1115 90 90 90 Pbnm atom x y z occ Uiso FeM1 0 0 0 .449 .01864 MgM1 0 0 0 .551 .01864 FeM2 .9902 .2792 .25 .551 .0218 MgM2 .9902 .2792 .25 .449 .0218 Si .4221 .0985 .25 .01201 O1 .7658 .0933 .25 .0245 O2 .2142 .4532 .25 .0217 O3 .2839 .1625 .0354 .01856