Spinel is often given as a gift for a 22nd wedding anniversary. Sardonyx is a combination of the minerals sard and onyx, which together form the reddish-brown or orange stone with bands of white ...

Spinels refer to minerals such as magnesium, nickel, or zinc packed tightly into cubic crystals. Spinel oxides have been ...

Alongside kaolinite, researchers also found spinel, a mineral typically associated with volcanic or metamorphic activity. This has left scientists with a burning question: Did the spinel form ...

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 ...