Blue John

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'' (album), an album by organist John Patton *Lance-Constable Bluejohn, a character in the ''Discworld'' series, a member of Ankh-Morpork City Watch * Blue John Gap, a fictional location in Arthur Conan Doyle's short story ''The Terror of Blue John Gap'' Provided by Wikipedia