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: Mg80Ni20 at T = 400 C _database_code_amcsd 0002707 4.76517 10.2566 5.99363 90 90 90 Pbnm atom x y z occ Biso Ni1 0 0 0 .350 0.67 Mg1 0 0 0 .650 0.67 Ni2 .9903 .2776 .25 .050 0.75 Mg2 .9903 .2776 .25 .950 0.75 Si .4256 .0935 .25 0.43 O1 .7660 .0927 .25 0.70 O2 .2223 .4476 .25 0.71 O3 .2765 .1624 .0332 0.74