Fluorapatite & Willemite from Franklin, NJ
Fluorapatite {Ca5(PO4)3F}- FL peach-orange, SW
Willemite {Zn2SiO4}- FL green, SW
Hyalophane - very weakly FL magenta, SW
Andradite - non-FL
Franklinite - non-FL

This is another classic Franklin fluorescent combination.  The fluorapatite has a "peach" fluorescence and occurs in a dense matrix of andradite-franklinite, often with some hyalophane and almost always with at least a few specks of willemite.  Some of the old miners used to call it "svabite" but it's technically not svabite.

The fluorapatite found in these assemblages is undoubtedly an arsenian variety, so I'd assign it a generic formula of something like {Ca5[(P,As)O4]3(F,Cl)}.   The reason I'd guess some Cl to be in there is that turneaureite does also occur at Franklin, though local collectors sometimes get surly if you claim you have turneaureite and you haven't had it verified by XRD / EDS or at least by a good sight-ID person.  Nobody knows why this happens.

Evidently, turneaureite can be found on the Buckwheat dump.  I've spent more time on the Buckwheat than would probably be considered reasonable, so chances are I've run onto both turneaureite and johnbaumite without knowing for sure.

Back to arsenian fluorapatite... without the Dunn monograph in front of me, I recall fluorapatite, johnbaumite, turneaureite, and related species can overlap with one another.  I also recall that no true svabite has yet to be  verified from Franklin, though the composition of arsenian fluorapatite starts to get close to svabite territory.  Not that it really matters when you're after "pretty colors".   There is nothing wrong with pretty colors.

There are different grades of brightness of the fluorapatite from Franklin and Sterling Hill.  Sometimes it fluoresces so dimly you can barely detect it over the intense brightness of willemite.

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Photograph originally used on the CR Scientific website. 
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