Derbyshire spar

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Der´by`shire spar´

1.(Min.) A massive variety of fluor spar, found in Derbyshire, England, and wrought into vases and other ornamental work.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in classic literature ?
The tankards are on the side-table still, but the bossed silver is undimmed by handling, and there are no dregs to send forth unpleasant suggestions: the only prevailing scent is of the lavender and rose-leaves that fill the vases of Derbyshire spar. All is purity and order in this once dreary room, for, fifteen years ago, it was entered by a new presiding spirit.
Blue John, or "Derbyshire Spar", takes its name from bleu-jaune (blue-yellow) probably from the days when worked pieces were sent to France to be mounted in ormolu (gilt bronze) and fitted with gilded handles and ornament by French craftsmen.
The semi-precious mineral Derbyshire Spar is better known as what?