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Bowl made from Derbyshire Blue John, on display in Castleton Visitor Centre French candelabra crafted of Blue John, c. 1860. 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 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.
An excavated piece of Blue John. At Treak Cliff and nearby Blue John Cavern, the fluorspar is uniquely banded, ranging from blue-black to white. The exact cause of the coloration is disputed, but it seems that the formation of Blue John requires a rare combination of porous limestone containing a little hydrocarbon, small traces of radioactive ...
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The mineral Blue John is now scarce, and only a few hundred kilograms are mined each year for ornamental and lapidary use. Mining still takes place in Blue John Cavern and Treak Cliff Cavern. [26] Recently discovered deposits in China have produced fluorite with coloring and banding similar to the classic Blue John stone. [27]
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related to: blue john stone price