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Product Description
Septarian Nodule Unpolished Stone Slab Rough Rock Utah
An unpolished but lovely stone slab of Septarian Nodule from Utah that is 4.6 inches by 3.76 inches and 5 mm thick.
It weighs .22 lbs. and is shown wet in the first 2 pictures.
This one has some translucency in the yellow calcite!
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.
