Six Antique Specimens of the Derbyshire Fluorspar ‘Blue John’

Six Antique Specimens of the Derbyshire Fluorspar ‘Blue John’

1800 to 1900 England

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Six Antique Specimens of the Derbyshire Fluorspar ‘Blue John’
19th Century

Size: 11cm high, 18.5cm wide – 4¼ ins high, 7¼ ins wide (max)
cf Finch and Co catalogue no. 9, item no. 71, for an example of a ‘Blue John’ goblet

Blue John is characterised by bluish purple and white banding and is composed of calcium fluoride. It is a variety of the mineral fluorspar, which acquired its name in the 15th century from its property of improving the fluidity of slag in smelting operations. Blue John is mined around Castleton in north Derbyshire and has been used as a semi-precious ornamental stone for more than two centuries.
Dimensions
Height 11.00 cm (4.33 inches)
Width 18.50 cm (7.28 inches)
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