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blue john
noun
- a blue or purple fibrous variety of fluorspar occurring only in Derbyshire: used for vases, etc
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Example Sentences
The opening of their mine has been called Blue John Gap, a clean-cut arch in the rock, the mouth all overgrown with bushes.
From Project Gutenberg
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.
From Project Gutenberg
The most beautiful are those made of fluor-spar, the celebrated Blue John Mine providing the most beautiful specimens.
From Project Gutenberg
There are also spar works where the fluor-spar, or Blue John, is wrought into a variety of useful and ornamental articles.
From Project Gutenberg
Twenty-nine of the choicest warriors instantly volunteered to follow Blue John in this hazardous enterprise.
From Project Gutenberg
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