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This polished slab is a thick slice of a large Septarian Nodule, a type of concretion from Utah. It shows neutral gray limestone with angular and brecciated patterning outlined in brown and filled with golden yellow calcite crystals.
Dimensions:
22.1cm x 19cm
1.1cm thick
2lb 5.5oz
Septarian Nodules are a type of concretion that forms around decomposing marine life (typically shells). In Utah, they formed during the upper Cretaceous period when the Gulf of Mexico covered much of North America. They are composed of gray limestone, brown Aragonite or Siderite, and yellow Calcite.