Every rockhound loves a good geode, and the best are those we’ve gathered ourselves. While it can be tempting to start busting every rock you find with a rock pick, you can usually tell before you attack. Geodes are a specific formation and can usually be identified by their round shape and bumpy texture. These reliable indicators don’t tell the whole story, however. So, let’s go a bit further and give you an overview of how to tell if a rock is a geode.