blue john

The opening of their mine has been called Blue John Gap, a clean-cut arch in the rock, the mouth all overgrown with bushes.

I had not told anyone that I proposed to come to the Blue John mine, and it was unlikely that a search party would come after me.

The most beautiful are those made of fluor-spar, the celebrated Blue John Mine providing the most beautiful specimens.

There are also spar works where the fluor-spar, or Blue John, is wrought into a variety of useful and ornamental articles.

Twenty-nine of the choicest warriors instantly volunteered to follow Blue John in this hazardous enterprise.