Ceirys Silver Blue John Jewellery
Ceirys Silver Blue John Jewellery Blue John Stone is a rare, semiprecious mineral found at only one location in the world just outside Castleton, in Derbyshire.
The name Blue John derives from the French Bleu Jaune meaning Blue Yellow. It is a form of fluorite and was discovered as miners were exploring the cave systems of Castleton for lead.
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