Hercynite
Lavina B, Cesare B, Alvarez-Valero A M, Uchida H, Downs R T, Koneva A, Dera P
American Mineralogist 94 (2009) 657-665
Closure temperatures of intracrystalline ordering in anatectic and metamorphic
hercynite, Fe2+Al2O4
Note: Sample AVHz20
Locality: El Hoyazo, lavas of the Neogene Volcanic Province of SE Spain
_database_code_amcsd 0004919
8.1517 8.1517 8.1517 90 90 90 *Fd3m
.125 .125 .125
atom       x      y      z  occ   Uiso
Fe2+T   .125   .125   .125  .77 .00732
Fe3+T   .125   .125   .125  .02 .00732
AlT     .125   .125   .125  .14 .00732
MgT     .125   .125   .125  .06 .00732
AlM       .5     .5     .5 .883 .00506
Fe2+M     .5     .5     .5 .044 .00506
MgM       .5     .5     .5 .043 .00506
Fe3+M     .5     .5     .5 .028 .00506
TiM       .5     .5     .5 .002 .00506
O     .26405 .26405 .26405       .0105