KEOKUK GEODES SPECIMENS

The area around Keokuk, Iowa is sometimes referred to as “the geode capital of the world. Geodes have been collected from the Lower Warsaw Formation within about 100 miles of the city for over 150 years. Keokuk geodes contain a variety of minerals, but quartz is dominant in most. Calcite is also a common mineral in many geodes, though 17 other minerals have been identified in Keokuk geodes, including pyrite and sphalerite.