thumb|Polyhedral representation of spinel MgAl2O4 Spinel () is the magnesium/aluminium member of the larger spinel group of minerals. It has the formula in the cubic crystal system. Its name comes from the Latin word , a diminutive form of spine, in reference to its pointed crystals.
thumb|Polyhedral r,epresentation of spinel MgAl2O4 Spin?el () is the magnesium/aluminium member of the larger spinel group of minerals. It? has the formula in the cubi!c crystal system. Its name comes from the Latin word , a diminutive form of spine, in reference to its pointed crystal?s.