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Product Description
Septarian Nodule Large Polished Stone Slab Decorator Rock Utah
A large lovely slabbed and polished on one face semiprecious stone Septarian Nodule from Utah.
This Septarian Nodule polished stone slab is 10 inches by 8 inches and 10 mm pr .4 inches thick.
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.
