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 = 900 C
_database_code_amcsd 0008778
8.1577 8.1577 8.1577 90 90 90 *Fd3m
.125 .125 .125
atom      x      y      z   occ  Uiso
AlT    .125   .125   .125  .283 .0168
MgT    .125   .125   .125  .717 .0168
AlM      .5     .5     .5 .8225 .0159
MgM      .5     .5     .5  .143 .0159
CrM      .5     .5     .5  .033 .0159
MnM      .5     .5     .5 .0005 .0159
ZnM      .5     .5     .5  .001 .0159
O    .26132 .26132 .26132       .0190