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  1. A Fun Guide To Septarian Nodules, What They Are …

    • Septarian nodules are an interesting find, whether you bought them or found them in the wild. There’s a lot more to them than meets the eye, however, especially for the rockhound interested in the nat… See more

    What Are Septarian Nodules?

    Septarian nodules are a type of concretion where mudstone of some kind is interspersed with calcite or another carbonate-rich mineral. The calcite portions follow the p… See more

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    How Are Septarian Nodules formed?

    The formation of Septarian Nodules is associated with the Cretaceous period. During this time, around 50 to 70 million years ago, these nodules formed in sedimentar… See more

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    Where Can I Find Septarians?

    Septarian nodules occur in a few places. Much of the material commonly seen actually comes from the mineral-rich island of Madagascar. These are generally filled with calcite … See more

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