Discover with Dr. Cool Crack Your Own Geodes - 12 Amazing Crystal Filled Rocks! FUN AND LEARNING  Break these geodes and introduce your child to volcanic crystal formations with this hands-on activity GREAT SELECTION  These fascinating geodes of varying sizes (1-2) will provide exciting fun for the whole family! 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 the occasional amethyst! START A ROCK COLLECTION  Have a rock collection? These spectacular crystal-filled rocks make the perfect addition to any collection