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BLUE JOHN - unpolished drill core sample - Castleton, Derbyshire

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Home > MINERALS > PRECIOUS AND SEMI-PRECIOUS GEMSTONES

  

'BLUE JOHN' FLUORITE

 Unpolished drill core sample
 
Treak Cliff, Castleton, Derbyshire

An short section of drill core consisting of solid blue john fluorite with some visible banding. A very unusual item!

Blue John is a variety of the mineral fluorite. It is only found in the vicinity of Treak Cliff, near Castleton in Derbyshire. It is typically banded with purple and white fluorite. Blue John has been mined for hundreds of years and made into jewelry, bowls, goblets, vases, and numerous other decorative items that are now prized throughout the world.

The origin of the name Blue John is not clear.  It is likely that it was a local name given to the stone by the Derbyshire lead miners who already knew the zinc mineral sphalerite by the nickname ‘Black Jack’. 

Click on a picture for a larger image


Size: 5.5 x 5 x 5 centimetres
Weight: 390 grams

PRICE: £15.00
Sorry, this item has been sold or is out of stock
BLUE JOHN  -  unpolished drill core sample  -  Castleton, Derbyshire
BLUE JOHN  -  unpolished drill core sample  -  Castleton, Derbyshire BLUE JOHN  -  unpolished drill core sample  -  Castleton, Derbyshire BLUE JOHN  -  unpolished drill core sample  -  Castleton, Derbyshire BLUE JOHN  -  unpolished drill core sample  -  Castleton, Derbyshire