/ · 1894 Brewer’s · B · Blue John (A)
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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.
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.
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