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Geodes were formed millions of years ago when prehistoric volcanoes erupted and gas bubbles became trapped in the lava. Gently hit one with a hammer and it will break open to reveal an incredible crystal cavern hidden within. This premium set includes a full-color guidebook, safety glasses and crystal geodes in a variety of types and colors ranging in size from 1.5"-2", plus pyrite geodes that look like plain old rocks from the outside but crack open to display a sparkling golden interior.