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 ...

A new study reveals that spinel, a vibrant and rare gem, can also be used as a qubit system. Spinels are a transparent gems that come in red, blue, black, lavender, white, yellow, and other colors.