Iowa State Rock – The Geode

ContentsThe History of the Iowa State RockLearning Links for Geodes – The Iowa State RockThe History of the Iowa State Rock The Iowa General Assembly designated the geode as the official state rock in 1967. Because Iowa is well known for the presence of the Geode, it was chosen as the official rock in an effort to promote tourism in the state. Legislators who favored making the Geode the state rock pointed...

Serpentine – State Rock

Serpentine rock is apple-green to black and is often mottled with light and dark colored areas. It has a shiny or wax-like appearance and slightly soapy feel. Serpentine is usually fine-grained and compact but may be granular, platy or fibrous. It’s found in central and northern California in the Coast Ranges, Klamath Mountains and Sierra Nevada foothills. Serpentine rock is primarily composed of one or more of...