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Blue John (also known as Derbyshire Spar) is a semi-precious mineral, a rare form of fluorite with bands of a purple-blue or yellowish colour. In the United Kingdom it is found only at Blue John Cavern and Treak Cliff Cavern at Castleton in Derbyshire.
Visit Treak Cliff Cavern in Castleton, the only place in the world where you can find Blue John stone. Learn about its formation, history and uses, and explore the stunning cave formations and museum.
Jul 1, 2024 · Blue John is a form of fluorspar, a halide mineral composed of calcium fluoride, with distinctive bands of colors ranging from purples and blues to yellows and browns. It is found only in the Blue John Cavern and Treak Cliff Cavern in England, where it has been mined for centuries for its ornamental and decorative uses.
Blue John Stone is now only mined in two caverns: Treak Cliff Cavern and Blue John Cavern. This mineral, a colour banded form of fluorspar, is so beautiful that it has been prized for many hundreds of years. The origin of the name ‘Blue John’ is thought to have come from the French ‘bleu et jaune’, meaning ‘blue and yellow’.
Learn about the rare, semiprecious mineral Blue John and how to mine, polish and craft it at Treak Cliff Cavern in Derbyshire. Book online for a unique, hands-on experience with the family who own and care for the mine.
Derbyshire Blue John is a semi-precious gemstone considered to be one of Britain’s rarest minerals. The distinctive bands of purple, blue and yellow that run through the stone make each piece of Blue John jewellery completely unique.
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Mar 23, 2021 · Learn about the history, geology and mining of Blue John, a unique variety of blue-purple banded fluorite found only in Castleton, Derbyshire. Discover how this rare mineral was used for ornamental and jewellery purposes and see some stunning examples.
