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| Fluor-spar: Elementary fluorine corrodes glass, therefore in place of it is a very old fluor-spar (calcium fluoride) containing traces
of radioactive material is shown here. Elementary fluorine is set free by the decay, which is released when breaking the mineral
and is recognizable by its characteristic smell. Amount; 0.4 g fluor-spar, fluorine unknown.
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| Elementary Fluorine: This is real elementary Fluorine, enclosed in quartz glass, which resists corrosion better than ordinary glass. Amount; 2.5
ml.
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| Fluorite crystals: Some fluorite fragments, typical of the different pastel shades of fluorite.
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