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Magnetite [Fe3O4]

Structure Cubic
Space Group Fd-3m (No. 227)
a=8.3941 Å
a=90.00
Z=8

Atomic Positional Parameters
Fe1 8a  0.1250 0.1250 0.1250
Fe2 16d 0.5000 0.5000 0.5000
O   32e 0.2549 0.2549 0.2549

Reference
ME Fleet (1981) Acta Crystallographica B, 37, 917

Mineral Chemistry
Magnetite has the spinel (MgAl2O4) structure, with a cubic close packed oxygen array, and iron in both fourfold and sixfold coordination; magnetite is frequently observed in nature as octahedral crystals exhibiting {111} faces. Magnetite occurs as an accessory mineral in many igneous and metamorphic rocks; magmatic segregation leads to magnetite forming large ore bodies.

The CHIME figure shows iron atoms as yellow spheres, and oxygens as red spheres.