Forsterite Ottonello G, Della Giusta A, Molin G M American Mineralogist 74 (1989) 411-421 Cation ordering in Ni-Mg olivines sample Ni.30B, heated at 1150 C, then quenched Mg1.4Ni.6SiO4 _database_code_amcsd 0001217 4.7453 10.1926 5.9559 90 90 90 Pbnm atom x y z occ Biso Ni1 0 0 0 .495 0.50 Mg1 0 0 0 .505 0.50 Ni2 .9908 .2760 .25 .121 0.56 Mg2 .9908 .2760 .25 .879 0.56 Si .4257 .0936 .25 0.43 O1 .7673 .0924 .25 0.55 O2 .2198 .4463 .25 0.53 O3 .2767 .1628 .0324 0.56