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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:
geode - (mineralogy) a hollow rock or nodule with the cavity usually lined with crystals. mineralogy - the branch of geology that studies minerals: their structure and properties and the ways of distinguishing them.