Ringwoodite
Hazen R M, Downs R T, Finger L W
American Mineralogist 78 (1993) 1320-1323
Crystal chemistry of ferromagnesian silicate spinels: Evidence for Mg-Si
disorder
Sample: SUNY 1013
8.1763 8.1763 8.1763 90 90 90 *Fd3m
.125 .125 .125
atom     x     y     z  occ B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3)
Si    .125  .125  .125      .00144 .00144 .00144      0      0      0
Mg      .5    .5    .5 .383 .00192 .00192 .00192 .00004 .00004 .00004
Fe      .5    .5    .5 .617 .00192 .00192 .00192 .00004 .00004 .00004
O    .2420 .2420 .2420      .00212 .00212 .00212 .00001 .00001 .00001