ROCK & GEM FIELD GUIDE:

Spinel is a captivating gemstone with a rich history of being mistaken for gems like ruby and sapphire.

- DR. STUART MILLS & PAM FREEMAN

Spinel-twinned gold crystal. Above, right: Elongated gold specimen is dramatically spinel-twinned.

Spinel

It is highly valued for its vibrant colors, durability, and brilliance and is a sought-after gem among collectors and jewelers alike.

Small spinel crystals have grown together to a produce big crystal

Formation

Spinel forms in a geological environment similar to corundum (sapphire and ruby) and often occurs alongside these minerals. It typically forms in metamorphic rocks like marble or gneiss, under high temperature and pressure. Spinel