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BLUE JOHN (SMALL POLISHED SLICE IN GEM BOX) - Castleton, Derbyshire

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Home > MINERALS > PRECIOUS AND SEMI-PRECIOUS GEMSTONES

 
'BLUE JOHN' FLUORITE

A gemstone unique to Derbyshire

Treak Cliff, Castleton, Derbyshire


A small example of Blue John showing banding.  It has been polished on one side and is presented in a gemstone display box with a glass lid.
 
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: 6 x 6 x 2 centimetres (size of box)
Weight: 48 grams (including box)

PRICE: £18.00
BLUE JOHN (SMALL POLISHED SLICE IN GEM BOX) - Castleton, Derbyshire
BLUE JOHN (SMALL POLISHED SLICE IN GEM BOX) - Castleton, Derbyshire BLUE JOHN (SMALL POLISHED SLICE IN GEM BOX) - Castleton, Derbyshire BLUE JOHN (SMALL POLISHED SLICE IN GEM BOX) - Castleton, Derbyshire BLUE JOHN (SMALL POLISHED SLICE IN GEM BOX) - Castleton, Derbyshire