Polurrian Rocks 55 – Detail of rock pattern and texture on the southern margin of the Lizard Boundary Fault zone at Polurrian Cove in Cornwall.
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Jessica's Nature Blog 
This is fascinating, like strands of yarn.
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Thank you, Claudia. The strands are veins that are standing proud of the rock surface due to weathering.
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I thought that might be it, that the white stone (quartz?) was harder than the surroundings, that has been eroded.
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