Blue John Cavern
Local highlightShow caves and rare Blue John stone workings.
One of the show caves in the hills above Castleton, Blue John Cavern is worked for Blue John, the banded purple-and-yellow fluorspar found nowhere in Britain but here and neighbouring Treak Cliff. Tours follow the old miners’ route down through a chain of natural chambers, and the stone is still dug in small amounts out of season and made up locally into jewellery. It’s a paid visit, on the flank of Mam Tor.
