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, 1st run, T = 400 C
_database_code_amcsd 0008767
8.1169 8.1169 8.1169 90 90 90 *Fd3m
.125 .125 .125
atom      x      y      z   occ  Uiso
AlT    .125   .125   .125  .126 .0099
MgT    .125   .125   .125  .874 .0099
AlM      .5     .5     .5  .901 .0083
MgM      .5     .5     .5 .0645 .0083
CrM      .5     .5     .5  .033 .0083
MnM      .5     .5     .5 .0005 .0083
ZnM      .5     .5     .5  .001 .0083
O    .26337 .26337 .26337       .0082