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 ...

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 ...

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