SEPTARIA (CUT HALF) - Yorkshire
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Holderness, Yorkshire
Septarian nodules, or ‘septaria’, are nodules 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.
They can be beautiful when cut and polished. Exactly how these nodules were formed is still not fully understood.
This specimen is half a nodule that has been cut and polished. It was collected from boulder clay on the Yorkshire coast and was brought there from further north by an ice sheet during the Ice Age.
Size: 8 centimetres diameter
Weight: 247 grams
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