Iowa’s state rock is the geode! http://publications.iowa.gov/135/1/profile/8-1.html State Symbols of Iowa: iowa.gov الأصل "State Symbols of Iowa" State Symbols of Iowa: iowa.gov State Symbols of Iowa: iowa.gov State Symbols Geode is the State Rock of Iowa State Symbols الأصل State Symbols of Iowa: iowa.gov State Symbols of Iowa: iowa.gov "State Symbols of Iowa" State Symbols of Iowa: iowa.gov State Symbols: Iowa.gov