BARITE CRYSTALS - Isle of Sheppey, Kent
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Isle of Sheppey, Kent
Isle of Sheppey, Kent
On the north coast of the Isle of Sheppey in Kent the London Clay cliffs contain large ‘septarian nodules’, which contain cracks lined with calcite. Beautiful white or translucent crystals of barite are found perched on the calcite.
This specimen is a lovely example. Presented in a plastic display box.
Septarian nodules are round concretions containing a network of internal cracks that have been filled with minerals, particularly brown and yellow 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. The process that created these nodules is still not fully understood.
Click on a picture for a larger image
Size: 8 x 5.5 x 3.5 centimetres (size of box)
Weight: 93 grams (including box)
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