Septarian `Dragon`s Egg` Geode

Black and Brown Polished Septarian "Dragon's Egg" Geode from Mahajanga, Madagascar
 

Size:  44 x 42 x 65mm

 

Weight:  162 gram

This hollow septarian nodule has been polished into an egg shape and the natural cracked pattern gives it the look of what we would imagine a dragon's egg would look like. The cavity is full of beautiful, black calcite crystals.  The piece will look great on display in office or as an interesting dcor piece in a home.

Septarian nodules is a hard, compact mass of rock that often forms around decaying organic matter and contains angular cavities or cracks, called "septaria" which have become filled with minerals such as calcite and aragonite.  Septarian nodules the concretions formed around decaying sea-life in a marine environment.

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.