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Dictionary of Phrase and Fable—B

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.

Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
Blue Laws
Blue Hen
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