The colorful rocks you explore with this kit will open up the world of Earth science and geology! Kick-start your very own rock collection with the 36 stones. Then use the included crystal powder and mold to grow a geode formation. Collect rocks and conduct experiments, such as a scratch test and float test, to discover their hidden properties. You'll even learn how to make your very own rock tumbler. Use the fact-filled book to keep exploring the world around you!For Ages: 8+WARNING: Choking Hazard; Small Parts. Not for Children Under 3 Years Old.