Geodes are round rocks containing a cavity that is lined with rock crystals.
A casual observer may pass by these rocks with no idea of the treasure contained inside, but if you pay attention and know what to look for, you might be rewarded with a fascinating discovery. Geodes are most often found in desert regions, but can be found almost anywhere including creek beds. I began my interest in geodes when I was in my teens, led on a hike through the woods in Indiana on a geode hunt. I doubted we would find anything, but to my delight, I did bring home several rocks that turned out to be geodes. The insides were nothing special, just a crust of quartz crystals, but it was a thrill to find something so out of the ordinary.