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 = 800 C
_database_code_amcsd 0008792
8.1577 8.1577 8.1577 90 90 90 *Fd3m
.125 .125 .125
atom      x      y      z   occ  Uiso
AlT    .125   .125   .125  .236 .0144
MgT    .125   .125   .125  .764 .0144
AlM      .5     .5     .5  .816 .0146
MgM      .5     .5     .5 .1175 .0146
CrM      .5     .5     .5 .0615 .0146
MnM      .5     .5     .5  .001 .0146
ZnM      .5     .5     .5 .0035 .0146
O    .26187 .26187 .26187       .0178