MgMnSiO4 Redfern S A T, Henderson C M B, Knight K S, Wood B J European Journal of Mineralogy 9 (1997) 287-300 High-temperature order-disorder in (Fe0.5Mn0.5)2SiO4 and (Mg0.5Mn0.5)2SiO4 olivines: an in situ neutron diffraction study Sample: T = 200 C _database_code_amcsd 0006679 4.82397 10.4977 6.1515 90 90 90 Pbnm atom x y z occ Biso MgM1 0 0 0 .732 .75 MnM1 0 0 0 .268 .75 MnM2 .9817 .2769 .25 .732 .75 MgM2 .9817 .2769 .25 .268 .75 Si .4225 .0930 .25 .62 O1 .7598 .0897 .25 1.02 O2 .2257 .4507 .25 .91 O3 .2793 .1612 .0377 1.07