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Septarian nodules occur when air bubbles are trapped in mud and become fossilized- similar to geodes when air gets trapped in cooling lava. The outer layer is often composed of limestone and the interior from aragonite and calcite.
This item is 5" x 4.5" and weighs 2lbs 4oz.
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We want you to be 100% satisfied with your purchase. Items can be returned or exchanged within 30 days of delivery.