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Arrests after theft of rare mineral Blue JohnBlue John is only found beneath Treak Cliff Hill, near Castleton, and gets its name from its distinctive colour. It is now only mined in two caverns - Treak Cliff Cavern and Blue John Cavern.
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Beautiful landscapesStop in Castleton and you can get below it all: four large natural caverns are open to the public. They were made more expansive by mining that began here during the time of Roman occupation.
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