Collection: Septarian

Septarian or Lightning Stone is a concretion of hard, compact mass of matter formed by the precipitation of mineral cement within the spaces between particles, and is found in sedimentary rock or soil. Concretions are often ovoid or spherical in shape, although irregular shapes also occur. The word 'concretion' is derived from the Latin con meaning 'together' and crescere meaning 'to grow'. Concretions form within layers of sedimentary strata that have already been deposited. They usually form early in the burial history of the sediment, before the rest of the sediment is hardened into rock. This concretionary cement often makes the concretion harder and more resistant to weathering than the host stratum.

There is an important distinction to draw between concretions and nodules. Concretions are formed from mineral precipitation around some kind of nucleus while a nodule is a replacement body.
5 products
  • Lake Michigan Septarian Cabochon
    Lake Michigan Septarian Cabochon Front View - Stone Treasures by the Lake
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    $15.00
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    $15.00
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  • Lake Michigan Septarian Pendant
    Lake Michigan Septarian Pendant - Stone Treasures by the Lake
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    $40.00
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    $40.00
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  • Lake Michigan Septarian Pendant Necklace
    Lake Michigan Septarian Pendant Necklace Front View - Stone Treasures by the Lake
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    $50.00
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    $50.00
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  • Septarian Cabochon
    Septarian Cabochon - Stone Treasures by the Lake
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    $10.00
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    $10.00
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  • Septarian Earrings
    Septarian Earrings - Stone Treasures by the Lake
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    $40.00
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    $40.00
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