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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 .
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]
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.
Fluorite mining (the main source of fluorine) was estimated in 2003 to be a $550 million industry, extracting 4.5 million tons per year. [4] Mined fluorite is separated into two main grades, with about equal production of each. Acidspar is at least 97% CaF 2; metspar is much lower purity, 60–85%.
Blue John or Bluejohn may refer to: Blue John, Kentucky, United States; Blue John (mineral), a form of fluorite mined in Derbyshire, England; Blue John Cavern, a cavern in Castleton, Derbyshire where fluorite is mined; Bluejohn Canyon, a canyon in Utah, United States, site of the Aron Ralston accident; Blue John, an album by organist John Patton
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