Forsterite
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 hyalosiderite
_database_code_amcsd 0000172
4.785 10.325 6.038 90 90 90 Pbnm
atom      x      y      z  occ Biso
Mg1       0      0      0 .535  .32
Fe1       0      0      0 .456  .32
Mn1       0      0      0 .006  .32
Ca1       0      0      0 .002  .32
Mg2  .98598 .27880    .25 .535  .37
Fe2  .98598 .27880    .25 .456  .37
Mn2  .98598 .27880    .25 .006  .37
Ca2  .98598 .27880    .25 .002  .37
Si   .42843 .09587    .25       .19
O1   .76566 .09430    .25       .40
O2   .21642 .45084    .25       .56
O3   .28264 .16370 .03435       .50