Rocks -- and the glittering minerals they're made of -- are everywhere: the walls of your room, the cars you travel in, the mountains you climb, and the planet you live on are all rocks! In Rocks, Minerals, and Gems, readers will learn about hundreds of rocks, minerals, crystals, and gems that were forged by the most powerful events in prehistory. Explore what specimens look like and how they're used today--readers can use the information to identify rocks and minerals themselves and open up a spectacular new world.