Spinelloid Ross C R, Armbruster T, Canil D American Mineralogist 77 (1992) 507-511 Crystal structure refinement of a spinelloid in the system Fe3O4-Fe2SiO4 _database_code_amcsd 0001459 5.867 8.917 8.362 90 90 90 Pmma atom x y z occ Uiso Fe1 .75 .1659 .2495 .0047 Fe2 .5 0 0 .0062 Fe3 .5 .3333 .5 .0052 Fe4 .75 .5 .2185 .0038 Fe1 .25 0 .3764 .84 .0050 Si1 .25 0 .3764 .16 .0050 Fe2 .25 .3255 .1321 .60 .0050 Si2 .25 .3255 .1321 .40 .0050 O1 .5046 0 .2477 .0113 O2 .25 .1715 .0031 .0110 O3 .25 .1694 .5010 .0092 O4 .4951 .3287 .2513 .0109 O5 .25 .5 .0280 .0134 O6 .25 .5 .5250 .0071