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SEPTARIA (CUT HALF) - Atlas Mountains, Morocco

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SEPTARIA

Cut and polished half of a septarian nodule

Atlas Mountains, Morocco
 
Septarian nodules, or 'septaria', are remarkable natural objects.  They are round concretions containing a network of internal cracks that have been filled with minerals, usually calcite. No traces of the cracks are visible on the surface of the nodule.  

 
The cracks are called ‘septa’ from the Latin word septum or ‘partition’, which gives the nodules their name.  Exactly how these nodules were formed is still not fully understood. 
  
This example has been selected for its attractive pattern of calcite 'septa'. 

Click on a picture for a larger image

Size:  5.5 x 5 x 1 centimetres
Weight: 65 grams

PRICE: £8.00