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 859
8.0709 8.0709 8.0709 90 90 90 *Fd3m
.125 .125 .125
atom     x     y     z B(1,1) B(2,2) B(3,3)  B(1,2)  B(1,3)  B(2,3)
Si    .125  .125  .125 .00199 .00199 .00199       0       0       0
Mg      .5    .5    .5 .00263 .00263 .00263 -.00016 -.00016 -.00016
O    .2441 .2441 .2441 .00197 .00197 .00197 -.00004 -.00004 -.00004