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: H-Cr, 2nd run, T = 500 C
_database_code_amcsd 0008801
8.1400 8.1400 8.1400 90 90 90 *Fd3m
.125 .125 .125
atom      x      y      z   occ  Uiso
AlT    .125   .125   .125  .109 .0114
MgT    .125   .125   .125  .891 .0114
AlM      .5     .5     .5 .8625 .0093
MgM      .5     .5     .5  .052 .0093
CrM      .5     .5     .5  .081 .0093
MnM      .5     .5     .5  .001 .0093
ZnM      .5     .5     .5 .0035 .0093
O    .26346 .26346 .26346       .0105