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called the crysta s lore flowers' and collectors have said fluorite is 'the most colourful mineral in the world'. Blue john is a variety of fluorite with curved bands of blue, purple, violet, yellow, and white. Some of the darker colours may appear black. The distinctive colours of this fluorite were made millions of years ago either by the inclusion of manganese or oil. There are at least 14 different banding patterns. Blue john is fragile and may be bonded with resins to help protect against damage. Blue john vase in the Natural History Museum, London name was supposed y derived from the French bleu et jaune, mean ing 'blue and yellow'. The only source of blue john is at Castleton in Derbyshire, England, giving the town its nickname of 'Gem of the Peaks'. The stone, in a fibrous to columnar form, was discovered by early miners seeking lead and is now found in two caverns in the Peak District National Park,