Reference > Brewer’s Dictionary > Blue John (A).

 Blue-jackets.Blue Laws (The). 
CONTENTS · BIBLIOGRAPHIC RECORD
E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
 
Blue John (A).
 
A petrefaction of blue fluor-spar, found in the Blue John mine of Tre Cliff, Derbyshire; and so called to distinguish it from the Black Jack, an ore of zinc. Called John from John Kirk, a miner, who first noticed it.   1
 


 Blue-jackets.Blue Laws (The). 

 
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