Size approx 2.5-3.5 inches and weight approx 0.4-0.8 lb per piece. Crack them open and find crystals inside! Open your own geode and add it to your crystal collection. Manufacturered by CXD-GEM. To crack your geodefirst place it inside an old sock.Lay sock on concrete floor or sidewalkand tap geode with hammer. Great for education childrens partiesany rock enthusiast and home decoration! You will receive 1 (one) Unopened Hollow Quartz Geode. The geode specimens are rough and irregular size and shape may vary.