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, 3rd run, T = 550 C
_database_code_amcsd 0008788
8.1379 8.1379 8.1379 90 90 90 *Fd3m
.125 .125 .125
atom      x      y      z   occ  Uiso
AlT    .125   .125   .125   .12 .0121
MgT    .125   .125   .125   .88 .0121
AlM      .5     .5     .5  .874 .0103
MgM      .5     .5     .5 .0595 .0103
CrM      .5     .5     .5 .0615 .0103
MnM      .5     .5     .5  .001 .0103
ZnM      .5     .5     .5 .0035 .0103
O    .26339 .26339 .26339       .0114