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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
HaliteLarge cubes of halite (sodium chloride) which is a common resource of salt. This specimen is from Orenburg, Russia
Fluorite, pale green octahedronWith calcite, galena and pyrite. Its properties include fluorescence and cubed crystals. Specimen from Glengowla East mine, Oughterard, Co. Galway, Eire
ConnelliteDeep-blue velvety crust of needles with some red cuprite. Connellite comprises of (hydrated copper sulphate chloride hydroxide). Specimen from Wheal Muttrell, Gwennap, Cornwall
Mendipite is exclusive to the Mendips of Somerset. This specimen is from Merehead Quarry. Mendipite belongs to the oxyhalides and hydroxyhalides group
Chlorargyrite is a mineral consisting of silver chloride
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