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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.
Entrance to Blue John Cavern. The cavern takes its name from the semi-precious mineral Blue John, which is still mined in small amounts outside the tourist season and made locally into jewellery. The deposit itself is about 250 million years old. The miners who work the remaining seams are also the guides for underground public tours.
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
Pages in category "Blue John (mineral)" The following 5 pages are in this category, out of 5 total. This list may not reflect recent changes. * Blue John (mineral) B.
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