(Neil) Armstrongite

Certainly not the most impressive fluorescent mineral, but it is quite rare any many people don't even know that it can fluoresce. It isn't the greatest photo (due to the long exposure) but it is probably the only one out there... The weakest red.

Locality: Dorozhnyi pegmatite, Khan Bogdo Massif, Gobi Desert, Mongolia

Source: Fluorescent Minerals Workgroup MKA.

Deep deep red, cause unknown...

and in white light...

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