This is a Utah septarian nodule or geode that I free-form polished. This is a very large septarian geode/nodule and it has a deep cavity that is full of beautiful calcite crystals. This one also has negative prints of fossil snails on the outside as well as fossils that are still covered just under the surface making this a rare one. Septarian also is UV reactive.
It weighs a whopping 11.5 lbs and is approximately 9” long, 7” wide and 4” deep.
shipping and packaging is included in the price
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.