Forsterite Heuer M Journal of Applied Crystallography 34 (2001) 271-279 The determination of site occupancies using a new strategy in Rietveld refinements Note: for calculation of powder patterns Locality: synthetic _database_code_amcsd 0020680 4.764 10.229 5.996 90 90 90 Pbnm atom x y z occ Biso MgM1 0 0 0 .88 .901 FeM1 0 0 0 .12 .901 MgM2 .9895 .2777 .25 .89 .969 FeM2 .9895 .2777 .25 .11 .969 Si .4265 .0944 .25 .783 O1 .7657 .0912 .25 .424 O2 .2195 .4475 .25 .424 O3 .2791 .163 .0335 .424