National Geographic - Crack Open 15 Geodes and Explore Crystals EXPLORE CRYSTAL CAVES - Geodes are naturally forming volcanic rocks that contain amazing crystal formations inside. Crack them open and discover beautiful minerals! PREMIUM QUALITY - National Geographic selects only the best geodes collected from multiple mines around the world, so youre guaranteed to find fascinating crystals INSPIRING A GENERATION  Kids love these treasure-filled rocks! Encourage an appreciation of nature and geology in your child with this extraordinary science kit TEACHING SCIENCE - Learn all about geodes and minerals with the full-color educational learning guide included RESPECTED QUALITY - National Geographic is proud to provide only the highest quality toys and all our kits are backed by our 100% satisfaction guarantee