Crack Your Own Geode - Large

Inside these dull looking rough rocks are hiding beautiful crystals and delicate swirls of chalcedony.  The only way to see these hidden treasures is to break the geode open.  Place the geode on a hard surface such as a concrete sidewalk.  tap it gently a few times with a hammer until it breaks open exposing its secret beauty for the first time in millions of years.  Be sure to wear eye protection or cover the geode with an old cloth when hitting it with the hammer.