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 ...

NASA’s Perseverance rover found pale rocks containing kaolinite on Mars, a mineral that forms in warm, wet conditions.

Rocks loafing about on the surface of Mars have been harboring secrets about the red planet's mysterious past.

Spinels and spinel structured oxide belong to a group of semi-precious gemstones sometimes found alongside rubies in rare rocks. The researchers found that the mineral also holds a rare quality ...