Isometric crystal system, a0 = 0.8396 nm; Z = 8. Anti-spinel structure. That is, 1/2 of Fe3 and all Fe2 occupy the octahedral position, and the other 1/2 of Fe3 occupy the tetrahedral position. The lattice constant a0 decreases with the increase of the substitution amount of Al3, Cr3 and Mg2, and increases with the increase of the substitution amount of Ti4 and Mn2.
Hexahedron crystal, Oh-m3m (3L44L36L29PC). Crystals are often octahedral and rhombohedral. On the rhombohedral plane of the rhombohedral dodecahedron, there are often stripes parallel to the diagonal direction of the face, which are {111} and {110} polymorphs (Fig. 4-4-3). According to {111} spinel law into twin crystals. The aggregates are usually in the form of dense granular blocks.
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