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Septarian is a crystal of earthy browns and yellows commonly found with deep brown to black geode crystal formations within. Septarian is believed to have formed during the Cretaceous period when sea levels were much higher.

Septarian specimens are combination of yellow calcite, brown aragonite, grey limestone and white or clear barite. Septarian nodules contain angular cavities as a result of cracking, called septaria, and create divisions throughout the stone. Calcite leeches into the cracks of septarian to form calcite crystals on a layer of aragonite, which is on bentonite clay. Eventually, bentonite is replaced with limestone, resulting in the nodule turning to stone.

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