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 = 450 C
_database_code_amcsd 0008783
8.1305 8.1305 8.1305 90 90 90 *Fd3m
.125 .125 .125
atom      x      y      z   occ  Uiso
AlT    .125   .125   .125  .122 .0111
MgT    .125   .125   .125  .878 .0111
AlM      .5     .5     .5  .873 .0097
MgM      .5     .5     .5 .0605 .0097
CrM      .5     .5     .5 .0615 .0097
MnM      .5     .5     .5  .001 .0097
ZnM      .5     .5     .5 .0035 .0097
O    .26336 .26336 .26336       .0101