Forsterite Henderson C M B, Redfern S A T, Smith R I, Knight K S, Charnock J M American Mineralogist 86 (2001) 1170-1187 Composition and temperature dependence of cation ordering in Ni-Mg olivine solid solutions: A time-of-flight neutron powder diffraction and EXAFS study Sample: Mg50Ni50 at T = 500 C _database_code_amcsd 0002685 4.75984 10.2469 5.97999 90 90 90 Pbnm atom x y z occ Biso Ni1 0 0 0 .726 0.80 Mg1 0 0 0 .274 0.80 Ni2 .9912 .2765 .25 .274 0.84 Mg2 .9912 .2765 .25 .726 0.84 Si .4252 .0932 .25 0.52 O1 .7676 .0932 .25 0.85 O2 .2213 .4465 .25 0.81 O3 .2758 .1619 .0324 0.82