Blue John Vessel. Made using fluorite from Derbyshire by Cornish craftspeople.

Sample of Blue John Fluorite from Derbyshire.

Fluorite. From Wheal Gorland, St Day, Cornwall. 

Fluorite. From Wheal Mary Ann, Menheniot, Cornwall. J.C. Williams collection. 

Fluorite crystals. From Coalcleugh Mine, Northumberland.

Flourite cubes with chalcopyrite on quartz. From Caradon Mine, St Ive, Cornwall.

Fluorite. From Weardale, County Durham. J.C. Williams collection.