Gems, Minerals, Crystals & Rocks–What's the Difference?

How can you distinguish rock from a mineral? Is that a gem, or is it a crystal? Learn what all these words really mean in this video!

See more rocks, minerals, gems, and crystals in the Mignone Halls of Gems and Minerals. The galleries feature more than 5,000 specimens from 98 countries and tell the fascinating story of how the vast diversity of mineral species arose on our planet.