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Webster's 1828 Dictionary

BLUE-JOHN

n.Among miners, fluor spar, a mineral, found in the mines of Derbyshire, and fabricated into vases and other ornamental figures.

 

Webster's 1913 Dictionary

BLUE-JOHN

BLUE-JOHN Blue "-john `, n.

 

Defn: A name given to fluor spar in Derbyshire, where it is used for ornamental purposes.