Spinel, MgAl 2 O 4 (download cif), is a rare gemstone that was used to imitate rubies. The structure has face-centered cubic symmetry, and is a little heavy to understand. The general formula is AB 2 ...

Synthesis and characterization of the Co3O4-CeO2 NCs. (Top) Schematic illustration of the preparation of CeO2-deposited spinel oxide NCs with a controlled layer of CeO2. (Bottom) HAADF-STEM images ...