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Rhombohedral calcite group exhibiting organic fluorescence



Rhombohedral calcite group, Beez, Namur, Belgium. It exhibits the typical yellow-green fluorescence and afterglow (PeL image). At shorter excitation wavelengths, the colour becomes more greenish due to a shift in emission maximum. Black full: 365 nm excitation. Blach dashed: 275 nm excitation.


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