Fayalite Birle J D, Gibbs G V, Moore P B, Smith J V American Mineralogist 53 (1968) 807-824 Crystal structures of natural olivines Note: variety hortonolite _database_code_amcsd 0000174 4.787 10.341 6.044 90 90 90 Pbnm atom x y z occ Biso Mg1 0 0 0 .49 .36 Fe1 0 0 0 .49 .36 Mn1 0 0 0 .01 .36 Ca1 0 0 0 .01 .36 Mg2 .98678 .27915 .25 .49 .47 Fe2 .98678 .27915 .25 .49 .47 Mn2 .98678 .27915 .25 .01 .47 Ca2 .98678 .27915 .25 .01 .47 Si .42870 .09576 .25 .18 O1 .76844 .09173 .25 .28 O2 .21419 .44958 .25 .18 O3 .28401 .16395 .03442 .37