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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:
Geodes are a variable phenomenon, which means that they may be created in various different ways. A geode is a round rock which contains a hollow cavity lined with crystals. Rocks which are completely filled with small compact crystal formations such as agate, jasper or chalcedony are called nodules.