Treak Cliff Cavern is a show cave near Castleton in Derbyshire, England. It is part of the Castleton Site of Special Scientific Interest[4] and one of only two sites where the ornamental mineral Blue John is still excavated (the other is the nearby Blue John Cavern).[5] As part of an agreement with English Nature, the Blue John that can be seen in the show cave is not mined but it is extracted in small quantities from other areas of the cave and made into saleable items like bowls, jewellery and ornaments.[6]
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