Crack Open A Geode.... And discover a whole new world. With this kit, you'll get the inside scoop on all things geode, like where they come from, where you can find them, and how they're formed. A ton of fun is waiting for you with activities to satisfy your curiosity. You get 4 real geodes to break open, a 32-page book all about geodes, safety goggles, and a magnifying glass to look at the beautiful crystals inside. Now, break that rock open! > (Ages 8 and up with Adult Supervision) Non-Toxic Latex Free Warning: Choking Hazard-Small Parts, Not for children under 3 yrs. "They may look like ordinary rocks, but inside you can find beautiful crystals. These rocks are called geodes (from a Latin word meaning "Earthlike"). They are generally round or oval (egg-shaped) and range from 2 to 12 inches (5 to 30 centimeters) in diameter, although some are larger……. As water flows through such rocks, minerals dissolve in it. The water carries these minerals and deposits them on the insides of the cavities. Over time, the minerals grow into crystals." --Facts for Now> Reviewed by Donald L. Koch State Geologist, Iowa Geological Survey Bureau, ISBN13: 9780545734523 ISBN10: 0545734525 Material Type: