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 ...

The superalloy formed lubricating spinel-based oxides and did not thicken or lose friction tolerance. The researchers note that it could be the unique structure of spinel itself helping it ...

“By leveraging spinel’s unique properties ... work like the perfect setup to control electron spin, the transparent structure ...