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 = 1000 C
_database_code_amcsd 0008779
8.1667 8.1667 8.1667 90 90 90 *Fd3m
.125 .125 .125
atom      x      y      z   occ  Uiso
AlT    .125   .125   .125  .293 .0184
MgT    .125   .125   .125  .707 .0184
AlM      .5     .5     .5 .8175 .0174
MgM      .5     .5     .5  .148 .0174
CrM      .5     .5     .5  .033 .0174
MnM      .5     .5     .5 .0005 .0174
ZnM      .5     .5     .5  .001 .0174
O    .26118 .26118 .26118       .0207