Septarian nodule. Section through a septarian nodule, showing its inner structure. Septarin nodules are round mineral deposits of claystone (brown) fi

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Septarian nodule. Section through a septarian nodule, showing its inner structure. Septarin nodules are round mineral deposits of claystone (brown) filled with cracks formed when the claystone dried up. Claystone is a clastic sedimentary rock composed primarily of clay-sized particles. The cracks fill with other minerals, often calcite (calcium carbonate) forming a variety of patterns that are often prized for their beauty. This specimen is from Newcastle, UK.

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Size: 4998px × 3567px
Photo credit: © DIRK WIERSMA/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

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