These are some of our favorites at Treehouse! Geodes are formed from fluids which crystallize in cavities within a rounded rock. They are found all over the world. You put your geodes in a bag or old sock, hit it firmly with a hammer (aiming for the center) and crack it open! Once it is open you can see all of the gorgeous sparkly crystals inside!
These geodes range from around 4.5" - 5.5"