Things You'll Need
Instructions
Place the geode on a stand so that it is stable.
Place the chisel toward the middle of geode and gently hammer a dent into the geode.
Move the chisel over slightly and repeat. Continue hammering all the way around the geode until you see a crack.
Follow the crack with the chisel and hammer, being even more gentle. Soon the crack will extend over the entire geode and it will open up.