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 ...

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Turning spinel into a solid state spin qubit system. When specific atomic defects are introduced in a gemstone, they create vacancy centers with unique properties that allow them ...