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Webster 1913 Edition

Blue-john

Blue′-johnˊ

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

Webster 1828 Edition

Blue-john

BLU'E-JOHN

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

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