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Identity HelpFluorescent green Willemite or Uraninite?

22nd Sep 2019 15:16 BSTBrian Fussell

I acquired a flat of fluorescent rocks collected from the sterling hill mine location I believe (waiting for confirmation on the location). Most are calcite,franklinite and willemite with some containing zincite.  The green fluorescing material on the this one I cant tell if it is fine grained willemite or possibly uraninite. Any opinions?

22nd Sep 2019 15:18 BSTBrian Fussell

pic 2

22nd Sep 2019 16:36 BSTPaul De Bondt Manager

Never saw fluorescent uraninite and I have quite a lot of them.
Willemite in this association.

22nd Sep 2019 17:01 BSTBrian Fussell

Thx Paul, not sure why I thought Uraninite fluoresced, im not familiar with the stuff.

22nd Sep 2019 17:35 BSTDonald B Peck Expert

Maybe because the Uranyl ion often fluoresces green?

22nd Sep 2019 18:25 BSTŁukasz Kruszewski Expert

A classic franklinite-zincite-willemite-... NJ specimen - very cool!

22nd Sep 2019 20:07 BSTStuart Herring

100% Sterling Mine, New Jersey!! Fluorescent calcite & willemite with black franklinite (check with magnet - if magnetic "franklinite-magnetite") and red zincite.  Do not assume that everything from the site (collecting area) are from Sterling Mine. Over the years much Franklin Mine (Franklin in general) material was put on the dumps (super dig).

22nd Sep 2019 20:26 BSTPaul Brandes Manager

Classic Sterling Hill and green fluorescing willemite. I would say "neat specimen", but every specimen from there is.......

23rd Sep 2019 13:42 BSTHarold Moritz Expert

Yep, a little bit of secondary willemite fluorescing in cracks the franklinite grains, very typical. That piece could be from Franklin or Ogdensburg.
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