Have fun when you open your own large whole geode to discover the beauty that lies within. A geode is a rock that contains a cavity lined with crystals or another mineral matter. Because these are natural stones, there is a variable in sizes. Shown are 2.5 inch to 5-inch sizes. This is a great earth science project for home schooled children.
How do you open a whole geode? A very simple way to crack a geode is simply to place the geode inside of a sock or fabric bag to contain the soon to be broken pieces. With the geode in a bag, gently striking the geode with a rock-hammer, sledgehammer, or even a harder rock should facture the geode just enough to crack it open.