So I'm in London at this Natural History Museum, in the calcite part of the rocks and mineral section. Lo and behold they have some fluorescent rocks from none other than Franklin NJ! That's right, read the label.
This particular piece is called Franklinite, named after the town in which it was discovered and is still the best place to find some. There were like five other rocks on display from Franklin which probably came from the Zinc mine which my Blogging Brothers and I have visited on many occasions:
Full circle now, your looking at the rocks former home. If you want to visit the zinc mine now then you might get lucky if one of my kind friends or relatives will comment its whereabouts.