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The home of Blue John Jewellery
Discovered nearly 2 thousand years ago by the Romans, Blue John is a rare natural variety of calcium fluorite, highly distincive and prized because of its characteristic bands of coloured veins. The only known deposit of this unusual mineral occurs in a hill to the west of Castleton in Derbyshire, England, opposite the mountain known as Mam Tor "The shivering mountain".
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