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 1300 C, then quenched Mg1.4Ni.6SiO4 _database_code_amcsd 0001218 4.7452 10.1909 5.9583 90 90 90 Pbnm atom x y z occ Biso Ni1 0 0 0 .478 0.61 Mg1 0 0 0 .522 0.61 Ni2 .9909 .2760 .25 .139 0.67 Mg2 .9909 .2760 .25 .861 0.67 Si .4262 .0936 .25 0.54 O1 .7666 .0924 .25 0.56 O2 .2199 .4463 .25 0.59 O3 .2765 .1627 .0322 0.65