This is the most famous source of the mineral on Buxton Road and it is thought the name is a corruption of the French description of the colours of the mineral, blue and jaune, blue and yellow.The geological name for the mineral is fluorspar, calcium fluoride and the colour is unique to the Derbyshire Peak District area.

It is also possible to see how this fabulously famous stone was mined and also to see the equipment that was used, as well as the natural features of the cavern itself.

The only day it closes is Christmas Day, and it is normally open 9.30 to 5.30 in the summer and 9.30 to dusk in the winter, weather permitting.

There is a wonderful gift shop, which has unique jewellery featuring the famous stone and also gifts and other souvenirs.

There are several wonderful caves and caverns littered around the Peak District.

Lots of them are a renowned source of the mineral Blue John, which is a stunning shade of different blues and golds, gaining its name from the French 'bleu jaune,' which describes the two unique colours of this mineral, making it very popular over the centuries and has been worked locally to make objects for decoration such as jugs, bowls, brooches and other jewellery which grace the tables and bodies the world over.

It is a very delicate mineral to work with, so the finest examples are now very expensive indeed.

Blue John is still worked today and the main centre for this is the Peak District town of Castleton, which is very close to the caverns and mines from which the mineral is extracted.

The caves and show caverns around Castleton include the unusually named 'Devils Arse,', but there are lots more to be found here such as the Pooles Cavern in Buxton, and Matlock Bath's Heights of Abraham.

The caves at Creswell were once occupied during the Stone Age and new archaeological artefacts have just been discovered as well as cave drawings.

Thor's cave is more of a big hole in the side of the hill, but is certainly worth a visit in the glorious Manifold Valley near Ashbourne.

There are lots of the cave shelters and caves which have yielded archaeological artefacts throughout the Peak District, as well as the potholes and caves explored by serious cavers, who are continually pushing themselves to gain the knowledge of the underground connections and discovering new places like the famous Titan Cave discovered recently, which is 475 feet deep.