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 = 550 C
_database_code_amcsd 0008773
8.1298 8.1298 8.1298 90 90 90 *Fd3m
.125 .125 .125
atom      x      y      z   occ  Uiso
AlT    .125   .125   .125  .119 .0121
MgT    .125   .125   .125  .881 .0121
AlM      .5     .5     .5 .9045 .0101
MgM      .5     .5     .5  .061 .0101
CrM      .5     .5     .5  .033 .0101
MnM      .5     .5     .5 .0005 .0101
ZnM      .5     .5     .5  .001 .0101
O    .26346 .26346 .26346       .0103