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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:
Interesting Facts. A geode begins as a bubble in volcanic rock or a hollow in sedimentary rock. The outer shell of the bubble or hollow will eventually harden, and water forms on the inside of the cavity. The water contains silica precipitation that contains a variety of dissolved minerals.