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: H-Cr, 3rd run, T = 650 C
_database_code_amcsd 0008805
8.1525 8.1525 8.1525 90 90 90 *Fd3m
.125 .125 .125
atom      x      y      z   occ  Uiso
AlT    .125   .125   .125  .129 .0142
MgT    .125   .125   .125  .871 .0142
AlM      .5     .5     .5 .8525 .0116
MgM      .5     .5     .5  .062 .0116
CrM      .5     .5     .5  .081 .0116
MnM      .5     .5     .5  .001 .0116
ZnM      .5     .5     .5 .0035 .0116
O    .26318 .26318 .26318       .0130