This item is discontinued and no longer availableNational Geographic STEM toy program aims to inspire, illuminate and teach future generations of young scientists and explorers. Geology doesn’t get more exciting then breaking open rocks and finding crystal treasures! Geodes can form with a variety of crystals inside and National Geographic has searched the globe to bring you the best variety of geodes. The information provided here is as complete and accurate as possible; however, product names, colours and/or materials are subject to change without notice.