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This listing has ended. Item:BLUE JOHN FLUORITE TUMBLESTONE ! AAA GRADE 1 |
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BEAUTIFUL BLUE JOHN FLUORITE CASTLETON , DERBYSHIRE THE 16TH RAREST STONE IN THE WORLD. LOVELY QUALITY TUMBLESTONE, BEAUTIFUL DEEP PURPLE ! ! IT MEASURES 3.5 X 2.4 X 1.8 CMS. Blue John Stone is a rare, semiprecious mineral found at only one location in the world - a hillside near Mam Tor, just outside Castleton, in the Derbyshire Peak District National Park, England. 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. Nowadays, the caves of Castleton are magnificent show caves and are some of the most popular tourist attractions in Derbyshire. Of the four show caves only Treak Cliff and, to a lesser extent, Blue John have veins of Blue John Stone. Treak Cliff Cavern still mines about 500 kilograms of Blue John Stone each year. The veins of Blue John Stone are easy to see and many of the formations are well lit. Blue John Stone is a semiprecious stone and gives Castleton its nickname of 'Gem of the Peaks'. Chemically, Blue John is calcium fluoride (CaF 2) which has been coloured by films of oil deposited on the crystals millions of years ago. Although it is known as fluorite the old miners, referred to it as fluor spar (sometimes spelt fluorspar). Fluorite often forms in cubic and octahedral crystals and is usually grey, yellow or purple in colour. Fluorite used to be mined mainly for iron smelting but now has many other uses including toothpaste.The form of fluorite unique to Castleton is banded purple and yellow or grey and is known as Blue John. Banded Blue John fluorite has been worked into ornaments since 1750. Blue John has been prized for ornaments and jewellery and it can be found in many great collections housed in places such as Windsor Castle, the White House and the Vatican.
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Postage and packaging Item location: Tain, United Kingdom Dispatches to: Worldwide
 
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