Kids will dig 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 your own geode formation. Collect rocks and conduct experiments, such as a scratch test and float test, to discover their hidden properties. The fun doesn't stop there - You'll even learn how to make your very own rock tumbler. Use the fact-filled book to keep exploring the world around you as you find more samples to collect. Included labeled tray keeps your rocks organized and ready to display. Kit includes: 36 rocks, display tray, crystal powder, geode mold, plaster and magnifying glass. Suitable for ages 8 and up.