Septarian Free-Form Nodule

This is an Utah Septarian nodule that I free-form polished. This is a large septarian nodule and it has a large solid core. This one also fossils that are still covered just under the surface around the outside of the nodule, Septarian also is UV reactive.
It weighs 8.65 lbs and is approximately 7” long, 6” wide and 3” deep.

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Septarian was formed in the ancient sea bottom during the Cretaceous period. They evolved from sea life from the time being encased in a nodule and this initiated the formation of a septarian nodule. In most of them the snail, clam or other critter is gone but the cavity remains and is filled with Aragonite (dark brown) and calcite that at times formed beautifully arranged yellow crystals on the inside of a hollow chamber.