- DISCOVER CRYSTAL TREASURE when you break open these rocks to find amazing crystals inside!
- COLORFUL VARIETY of hand-selected geodes for interesting, vibrant crystals
- 100% NATURAL GEODES may be as big as a tennis ball or as small as a ping-pong ball and are the perfect size for kids
- 16 PAGE FULL-COLOR LEARNING GUIDE describes how geodes are formed and details the variety found in nature
- 100% SATISFACTION GUARANTEED – For 129 years, National Geographic has provided fascinating and fun educational opportunities to aspiring scientists around the world