SEPTARIA (cut half with strontianite crystals) - France
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SEPTARIA
Cut half containing crystals of strontianite
Pontault-Combault, Seine-et-Marne, France
A cut but unpolished section through a septarian nodule from France showing calcium-rich strontianite crystals in the fissures.
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. Exactly how these nodules were formed is still not fully understood.
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Size: approx. 11 x 10.5 x 5 centimetres
Weight: 750 grams
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