Septarian "Dragon Egg" Geode
Size: 120mm x 60mmx 53mm
Weight: 532 gram
Origin: Betsiboka Region of Madagascar
Age: Middle to Late Jurassic (201 to 164 Million Years)
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Septarian or septarian nodules are concretions containing angular cavities or cracks, called "septaria" which have become filled with calcite and aragonite. A concretion is a hard, compact mass of rock that often forms around decaying organic matter. In the case of septarian nodules the concretions formed around decaying sea-life in a marine environment.
The exact mechanism for how the cracks form in the concretions is a mystery. One possible mechanism is the dehydration of the clay-rich core of a concretion causing it to shrink and crack. Another is the cracks being due to the expansion of gases produced by the decay of organic matter within a concretion. Earthquakes have also been suggested as yet another mechanism.
The cracks in the concretions are then filled in with minerals such as calcite (yellow) and aragonite (brown) and sometimes pyrite causing the very interesting patterns, which have often been described as dragon's skin. They are frequently found as geodes with hollow, calcite crystal filled cavities. More rarely the fossils that originally started the formation of the concretion are still preserved in the septarian.
The photos are taken in light studio but best efforts are made to reflect the true colour of the stones but there may be some variation in natural light.
The piece in the image is the exact piece you will receive.