n.a hard glassy mineral consisting of an oxide of magnesium and aluminum; occurs in various colors that are used as gemstones

Lithium insertion into manganese spinels
Lithium insertion into manganese spinels. Mat Res Bull 18: 461-472
Colossal magnetoresistance in Cr-based chalcogenide spinels
The thermodynamics of cation distributions in simple spinels
Surface treatments of Li 1+ x Mn 2? x O 4 spinels for improved elevated temperature performance
Rapid room-temperature synthesis of nanocrystalline spinels as oxygen reduction and evolution electrocatalysts
Dry reforming of methane over nickel catalysts supported on magnesium aluminate spinels
Theory of Ionic Ordering, Crystal Distortion, and Magnetic Exchange Due to Covalent Forces in Spinels
Physical Properties and Cation Arrangement of Oxides with Spinel Structures I. Cation Arrangement in Spinels
Sorption of noble gases by solids, with reference to meteorites. II - Chromite and carbon. III - Sulfides, spinels, and other substa...