Derbyshire Blue John

Derbyshire Blue John, by Trevor Ford, edited by Tony Waltham and Noel Worley, Third Edition published 2019 by East Midlands Geological Society: Nottingham; ISBN 9780951971796.
The definitive text on the geology, mining, history, production and collections of Blue John, the decorative form of banded fluorite mineral that is found only in the Castleton area of Derbyshire.
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