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Blue John vaseA vase carved out of the mineral Blue John. The mineral is so far unique to one location in the Derbyshire Peak District, England
Blue JohnPolished slice of Blue John from Derbyshire, England. The mineral is so far unique to one location in the Derbyshire Peak District, England
Fluorite, pale green octahedronWith calcite, galena and pyrite. Its properties include fluorescence and cubed crystals. Specimen from Glengowla East mine, Oughterard, Co. Galway, Eire
Blue John specimenA compact banded variety of Fluorite known as Blue John, found only in Castleton, Derbyshire, England. Specimen on display at the Natural History Museum, London
Fluorite6mm octahedral purple crystal on calcite collected from the Smith Vein, 1987. Green centre of the crystal does not show on film. Specimen from Carrock mine, Caldbeck, Cumbria
Yellow fluoriteA specimen of yellow fluorite (calcium fluoride) with white quartz (silicon dioxide) and brassy chalcopyrite, from Caradon Mines, Liskeard, Cornwall
Fluorescent groupA group including amber, ruby, ivory, fluorite and opal photographed in ultra violet light. See 179 for the same group in white light