Hercynite
Lavina B, Princivalle F, Della Giusta A
Physics and Chemistry of Minerals 32 (2005) 83-88
Controlled time-temperature oxidation reaction in a synthetic Mg-hercynite
Spinel structure
Sample: Annealing temperature and time T = 600 C, t = 242 h
_database_code_amcsd 0008944
8.1347 8.1347 8.1347 90 90 90 *Fd3m
.125 .125 .125
atom      x      y      z  occ  Uiso
AlA    .125   .125   .125  .17 .0080
Fe2+A  .125   .125   .125  .54 .0080
Fe3+A  .125   .125   .125  .06 .0080
MgA    .125   .125   .125  .23 .0080
AlB      .5     .5     .5 .875 .0054
Fe2+B    .5     .5     .5  .05 .0054
Fe3+B    .5     .5     .5  .03 .0054
MgB      .5     .5     .5 .035 .0054
O    .26310 .26310 .26310      .0093