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'BLUE JOHN' (SMALL POLISHED PIECE) - Castleton, Derbyshire

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Home > PREVIOUSLY SOLD ITEMS > PREVIOUSLY SOLD BRITISH MINERALS, ROCKS AND RELATED ITEMS

 
'BLUE JOHN' FLUORITE

A gemstone unique to Derbyshire

Treak Cliff, Castleton, Derbyshire


A small but good example of Blue John showing distinct banding.  It has been polished on four sides.  
 
Blue John is a banded variety of the mineral fluorite.  It is only found in the vicinity of Treak Cliff, near Castleton in Derbyshire.  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: 4 x 4 x 4 centimetres
Weight: 110 grams

PRICE: £0.00
Sorry, this item has been sold or is out of stock