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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 .
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.
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]
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 ...
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
Here's everyone who skipped the 2025 Grammy Awards and why they decided to miss the event.
Fluorite-related pages. Subcategories. This category has the following 2 subcategories, out of 2 total. B. Blue John (mineral) (5 P) M. Fluorite mines (2 C, 3 P)
Authorities battling a series of large wildfires in the Los Angeles area have employed a bright red fire retardant to tamp the flames, leading to dramatic images of the material blanketing scores ...
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