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Product Description
Septarian Nodule Unpolished Stone Slab Rough Rock Utah
An unpolished stone slab of Septarian Nodule from Utah that is 6 inches by 4.25 inches and 11 mm thick.
It weighs .52 lbs. and is shown wet in the first 2 pictures; it has a coating on one side of some kind of resin that has yellowed 3rd picture).
It does have a fracture line running vertically on the right side (4th picture).
This material was formed when the Gulf of Mexico extended into what is now Southern Utah.
Decomposing sea life (especially seashells) had molecular attraction for the sediment surrounding them, forming mud balls. As the ocean receded, the balls dried and cracked. The oceans returned, depositing more sediments. Aragonite then formed on the edges of the cracks and yellow Calcite crystals formed in the spaces.
The name comes from the Aragonite dividing ("septurn" in Latin) the calcite from the clay.
