Blue John or Black Jack?

Let's start at the beginning: where does the name 'Blue John' come from?  The traditional story is that the French named it bleu-jaune, meaning 'blue-yellow' when it was exported to France during the second half of the eighteenth century.  Another theory is that the English miners who were extracting the mineral first thought they uncovered 'Black Jack,' a … Continue reading Blue John or Black Jack?