On a geode.....the beauty is not skin deep, its deep inside! This kit comes with 12 3 - 4 inch morrocan geodes. We have hand selected our geodes so they will be hollow inside, unlike many of the cheap ones you see. Whats a geode? Its a geological rock formation that contains a cavity lined with crystals. The most common "find" inside a geode is clear quartz crystals, but some have colored crystals. Theres no way to tell whats inside a geode until you break it apart-but thats the most exciting part! Size: approx. 3"-4". WARNING CHOKING HAZARD. Not for under 3 yrs.