Septarian or septarian nodules are concretions containing angular cavities or cracks, called "septaria". The cracks in the concretions are filled in with minerals such as calcite (yellow) and aragonite (brown) and sometime pyrite causing the very interesting patterns. Rarely the fossils that originally started the formation of the concretion are still preserved in the septarian.
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SEPTARIAN SPHERES FOR SALE

: $15 to $195