Keokuk Geode: Interesting Clear and Bronze Calcite Crystals; 56.2 mm; Iowa

These geodes were formed as concretions lying in mud layers that deposited in a shallow sea over 300 million years ago. Eventually, the material in the concretions dissolved, and the resulting hollows were filled with crystals of quartz, calcite and other minerals. Over time, the geodes have weathered out of the host rocks.

This piece has interesting, flattened water-clear calcite crystals on a background of glittering bronze-brown crystals that coat its interior walls. The smooth outer shells have been mistaken for fossils, and this one has an odd little "nose." Around 20 different minerals have been found within Keokuk geodes, and the little world within this piece just begs to be explored with a loupe or magnifying glass.

Photos were taken in direct natural sunlight and show the specimen dry.

Approx. Size: 56.2 mm (maximum specimen dimension)
Shape/Cut: geode/interior exposed
Origin: Lee County, Iowa (USA)
Known treatment(s): none

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