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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:
As the rest of the limestone desolves away, the quartz geode remains. About every 1 in 3 in this area are hollow and display a beautiful crystal pattern when broken open. Geodes in the soil around the steam. This is a large limestone block with geodes stuck in the eroded groves. My dad with a bucket full of geodes. Collecting geodes from the stream bed.