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About Keokuk Geodes. Keokuk Geodes. Keokuk, Iowa is situated at the confluence of the Mississippi and Des Moines Rivers in the extreme southeastern portion of the state of Iowa. Illinois borders Iowa on the east and Missouri is to the south (area known locally as the Tri-State area). See map below for a visual view:
Often found in North America, Central America, South America and Namibia, and a common sight in museum gift shops, geodes are rock formations that involve a variety of minerals. At its most basic, geodes are rocks with an interior cavity lined with another mineral. The name geode comes from the Greek word âgeodeâ meaning âearthlike.â This name is fitting as many geodes are round, like little planets--worlds of light and stone unto themselves capturing fascination wherever they are discovered.