Spinel
Martignago F, Dal Negro A, Carbonin S
Physics and Chemistry of Minerals 30 (2003) 401-408
How Cr3+ and Fe3+ affect Mg-Al order-disorder transformation at high temperature
in natural spinels
Sample: L-Fe, 2nd run, T = 450 C
_database_code_amcsd 0008817
8.1280 8.1280 8.1280 90 90 90 *Fd3m
.125 .125 .125
atom      x      y      z   occ  Uiso
AlT    .125   .125   .125  .118 .0106
FeT    .125   .125   .125  .014 .0106
MgT    .125   .125   .125  .857 .0106
AlM      .5     .5     .5  .899 .0090
FeM      .5     .5     .5 .0335 .0090
MgM      .5     .5     .5 .0665 .0090
O    .26337 .26337 .26337       .0100