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Blue John Cavern facts for kids

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Not to be confused with Blue John Canyon.
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Blue John Cavern
Blue John Veins in the Blue John Cavern.jpg
Blue John seams in the cavern
Location Castleton, Derbyshire
England
Geology Blue John
Entrances 1

The Blue John Cavern is one of the four show caves in Castleton, Derbyshire, England.

Description

Blue John Cavern entrance
Entrance to the Blue John cavern

The cavern takes its name from the semi-precious mineral Blue John, which is still mined in small amounts outside the tourist season and made locally into jewellery. The deposit itself is about 250 million years old.

The miners who work the remaining seams are also the guides for underground public tours. The eight working seams are known as Twelve Vein, Old Dining Room, Bull Beef, New Dining Room, Five Vein, Organ Room, New Cavern and Landscape.

In 1865, Blue John Cavern was the site of the first use of magnesium to light a photograph underground. It was taken by Manchester photographer Alfred Brothers.

Blue John

In the UK Blue John, or "Derbyshire Spar", is found only in Blue John Cavern and the nearby Treak Cliff Cavern. It is a type of banded fluorite. The most common explanation for the name is that it derives from the French bleu-jaune, meaning 'blue-yellow', but other derivations have been suggested.

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