Fluorite - large purple crystals associated with siderite - from Alston, Cumberland, England.

Fluorite - a small group of purple prismatic crystals - associated with calcite and galena - shows intense fluorescence under UV light - from Cumberland, England, EUROPE.

Fluorite, purple prismatic crystals with intense fluorescence, from Cumberland, England

Fluorite - blue crystals with dolomite and ferruginous earth - from Ullcoats mine, Egremont, Cumberland, England

Fluorite - purple crystals associated with siderite, sphalerite and minor quartz - from Alston, Cumberland, England

Fluorite - purple cubes associated with siderite and minor calcite and pyrite - by comparison with G.1890.114.290, .291 and .292; almost certainly from Alston, Cumberland, England

Fluorite - large purple cubes partially coated with quartz and calcite - probably from Allanhead, Cumberland, England

Fluorite, pale green octahedral crystals made up of minute cubes associated with quartz, from East Pool Mine, Illogan, Cornwall, England, EUROPE.

Fluorite - purple - were green; changed due to 30 years of exposure to UV light - cubes on matrix - from White's Level, Middlehope Burn, Weardale, Durham, England, EUROPE.

Fluorite - gem quality crystals - green in transmitted light and blue in incident light - from Weardale, Durham, England

Fluorite - greenish-purple twinned crystal cubes - from Weardale, Durham, England.

Fluorite - an aggregate of purple prismatic crystals - probably from Castleton, Derbyshire, England.

Fluorite - an aggregate of colourless to white prismatic crystals - from Derbyshire, England.

Fluorite, variety Blue John - a nodule - dark purple veining in a mainly colourless translucent matrix - probably from Derbyshire, England

Fluorite - colourless cubes with inclusions of chalcopyrite and associated with galena - from Derbyshire, England

Vase of Blue John fluorite, large and two-handled, with Sienna marble lower moulding, probably carved by James Shore, Derbyshire, England, late 1840s