Crack 2 Large Geodes - Break Amazing Rocks and Discover Crystals! by Unknown FUN AND LEARNING  Break these geodes and introduce your child to volcanic crystal formations with this hands-on activity TENNIS BALL SIZE  These large, high-quality geodes will provide exciting fun for the whole family! Dont settle for the marble-sized geodes in other kits PERFECT KIDS ACTIVITY  Does your child have tons of energy? Engage them in this hands-on geology project! CRYSTAL EXPLORATION  Break these amazing rocks and find crystals such as quartz, calcite, fluorite, or even amethyst! START A ROCK COLLECTION  Have a rock collection? These spectacular crystal-filled rocks make the perfect addition to any collection