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-Cr, 3rd run, T = 700 C
_database_code_amcsd 0008776
8.1423 8.1423 8.1423 90 90 90 *Fd3m
.125 .125 .125
atom      x      y      z   occ  Uiso
AlT    .125   .125   .125  .223 .0147
MgT    .125   .125   .125  .777 .0147
AlM      .5     .5     .5 .8525 .0128
MgM      .5     .5     .5  .113 .0128
CrM      .5     .5     .5  .033 .0128
MnM      .5     .5     .5 .0005 .0128
ZnM      .5     .5     .5  .001 .0128
O    .26210 .26210 .26210       .0164