Book excerpt: You step carefully along the shore of a river. A lumpy rock catches your eye. You pick it up and smile as you drop the lightweight rock into your bucket. When it's split open, you see beautiful blue crystals glittering in the light. It's a geode--just like you thought! Find out how geodes form, where they are found, and about some of the most amazing geode discoveries. Then learn how you can find and collect these marvelous mineral-filled rocks too!