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DISCOVER CRYSTAL TREASURE - Break open these rocks to reveal amazing crystals inside! Geology doesn’t get more exciting than breaking open rocks and finding crystal treasures. Ag great STEM activity that also makes an excellent gift for girls and boys! COLOURFUL VARIETY – Geodes can form with a wide variety of crystals inside. These geodes have been hand-selected to bring you the best variety available. 100% NATURAL GEODES – These real specimens may be as big as a tennis ball, or as small as a ping-pong ball. Kids will love the thrill of cracking them open to see the natural beauty inside. This STEM activity emphasizes fun and discovery! 16 PAGE FULL-COLOUR LEARNING GUIDE – You’ll learn all about the fascinating science behind how geodes are formed in the detailed, full-color learning guide. National Geographic educational toys make science and learning fun, and are the perfect STEM gifts for boys and girls! SATISFACTION GUARANTEED – The National Geographic STEM series provides kids high-quality educational toys that are a whole lot of fun! If your experience is anything less than extraordinary, let us know so we can make it right for you. EXPLORE CRYSTAL CAVES – Geodes are naturally forming volcanic rocks that contain amazing crystal formations. Crack them open and discover beautiful minerals! PREMIUM QUALITY – National Geographic selects only the best geodes collected from multiple mines, so you’re guaranteed to find stunning crystals INSPIRING A GENERATION – Kids love these treasure filled rocks! Promote an appreciation of nature and geology in your child with this fun science kit TEACHING SCIENCE – Learn all about geodes and minerals as you journey with your child through our full-color educational learning guide RESPECTED QUALITY – National Geographic is proud to provide only the highest quality toys and all our kits are backed by our 100% satisfaction guarantee