A large cabinet sized calcite from Belgium

Quite a bolder and a quite pretty bicolored one! Locatlity: Bertrix, Luxemburg, Belgium. I haven't a clue what causes the somewhat "special" fluorescence. Clearly different generations of calcite in an apparently fractured configuration... Seen under SW and MW-UV.

Source: Fluorescent Minerals Workgroup MKA

Not your 'run of the mill' manganese-activated calcite!

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