Forsterite
Ottonello G, Della Giusta A, Molin G M
American Mineralogist 74 (1989) 411-421
Cation ordering in Ni-Mg olivines
sample Ni.30A, heated to 800 C, then quenched
Mg1.4Ni.6SiO4
_database_code_amcsd 0001220
4.7459 10.1950 5.9559 90 90 90 Pbnm
atom     x     y     z  occ Biso
Ni1      0     0     0 .508 0.65
Mg1      0     0     0 .492 0.65
Ni2  .9906 .2760   .25 .089 0.70
Mg2  .9906 .2760   .25 .911 0.79
Si   .4261 .0936   .25      0.59
O1   .7667 .0927   .25      0.66
O2   .2210 .4462   .25      0.71
O3   .2760 .1628 .0321      0.73