Septarian Nodule look-alikes
Septarian Nodule (composed of calcite, aragonite, and chalcedony/quartz within a mudstone or shale matrix)
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Open the appSeveral rocks and minerals can be confused with Septarian Nodule. Below are documented look-alikes and the features that tell them apart. Never rely on a single feature. Always check multiple properties.
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Concretion
Concretion
Also known as: Nodule
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Thunder Egg
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