Wrap the Geode in a sock or t-shirt, then place on a firm surface. Secure the Geode so it does not roll. For novices, use a regular screwdriver and hammer. More advanced folks use your chisel and rock hammer. Place the chisel/screwdriver in the middle of the Geode, and gently tap a few times with the hammer. Rotate the Geode a quarter turn and tap again. Continue this until you see a crack form all the way around the Geode. Once the crack forms, pull the two halves apart and take a look inside!