Fayalite
Birle J D, Gibbs G V, Moore P B, Smith J V
American Mineralogist 53 (1968) 807-824
Crystal structures of natural olivines
_database_code_amcsd 0000173
4.816 10.469 6.099 90 90 90 Pbnm
atom      x      y      z  occ Biso
Fe1       0      0      0 .922  .41
Mg1       0      0      0 .039  .41
Mn1       0      0      0 .037  .41
Ca1       0      0      0 .002  .41
Fe2  .98608 .28004    .25 .922  .36
Mg2  .98608 .28004    .25 .039  .36
Mn2  .98608 .28004    .25 .037  .36
Ca2  .98608 .28004    .25 .002  .36
Si   .43070 .09723    .25       .27
O1   .76683 .09197    .25       .43
O2   .21027 .45308    .25       .48
O3   .28806 .16532 .03626       .52