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: M-Cr, 1st run, T = 200 C
_database_code_amcsd 0008781
8.1116 8.1116 8.1116 90 90 90 *Fd3m
.125 .125 .125
atom      x      y      z   occ  Uiso
AlT    .125   .125   .125  .117 .0073
MgT    .125   .125   .125  .883 .0073
AlM      .5     .5     .5 .8755 .0068
MgM      .5     .5     .5  .058 .0068
CrM      .5     .5     .5 .0615 .0068
MnM      .5     .5     .5  .001 .0068
ZnM      .5     .5     .5 .0035 .0068
O    .26343 .26343 .26343       .0076