[Rockhounds] fossils

[Axel Emmermann]

That 's not logical, Gene.
Aragonite can absorb uranyl, calcium doesn't (I don't know if it even can).
More likely there are some thin layers of uranyl bearing hyalite
incorporated in the calcite (if it is that).
That would explain the green fluorescence.

I think this may need confirmation from a professional but I'm pretty
sure...

Axel Emmermann
European Regional Vice President of the
Fluorescent Mineral Society
<http://www.uvminerals.org/>
=========================
Mineralogische Kring Antwerpen/Antwerp Mineralogical Society
<http://www.minerant.org/index.html>
Werkgroepleider/Workgroup leader: Fluorescerende mineralen/Fluorescent
minerals
Technische Realisaties/Engineering
My website:<http://users.pandora.be/axel.emmerman/home/>


> -----Oorspronkelijk bericht-----
> Van: rockhounds-bounces at lists.drizzle.com
[mailto:rockhounds-bounces at lists.drizzle.com]
> Namens Gene Hartstein - Fossilnut.com
> Verzonden: donderdag 30 april 2009 5:08
> Aan: Rockhounds at drizzle.com: A mailing list for rock and gem collectors
> Onderwerp: Re: [Rockhounds] fossils
> 
> The Sewell belemnites are calcite... I believe, not aragonite. The
> Belemnites from one location in Mullica Hill, not far from Sewell are
> Vivianite.
> 
> Gene Hartstein
> ----- Original Message -----
> From: <betdav97 at aol.com>
> To: <rockhounds at lists.drizzle.com>
> Sent: Tuesday, April 28, 2009 10:21 PM
> Subject: Re: [Rockhounds] fossils
> 
> 
> > the ones I am referring to?are Belemnitella americana,
> > Chestnut Creek, Sewell, New Jersey.?
> > dave?
> >
> >
> > -----Original Message-----
> > From: Kreigh Tomaszewski <Kreigh at tomaszewski.net>
> > To: Rockhounds at drizzle.com: A mailing list for rock and gem collectors
> > <rockhounds at lists.drizzle.com>
> > Sent: Tue, 28 Apr 2009 7:46 pm
> > Subject: Re: [Rockhounds] fossils
> >
> > Interesting. I never thought of sticking my belimnites under a black
> > light. They were a bright yellow. Chalcedony, collected at Pierre, SD.?
> > ?
> > Kreigh?
> > ?
> > On Tuesday, Apr 28, 2009, at 12:45 America/Detroit, Earl R. Verbeek
> > wrote:?
> > ?
> >>?
> >> Axel,?
> >> ? I noticed your belimnites are chalcedony. Ours on this side of the?
> >> Atlantic are the same color, but aragonite. You would have thought?
> >> your chalcedony ones would be green, since many chaledony items?
> >> fluoresce green here.?
> >> dave?
> >>?
> >> Hi Dave and Axel,?
> >>?
> >> "Our" chalcedonies often fluoresce green due to trace amounts of >
uranyl
> >> ion.?
> >> This is particularly common in the desert Southwest, where volcanic >
> >> rocks?
> >> abound. Uranium is strongly partitioned in silicic magmas and hence is?
> >> concentrated in dacites and rhyolites, from which it is readily >
leached
> >> into?
> >> the groundwater system and incorporated into chalcedony vein fillings >
> >> and?
> >> "chalcedony roses" in large vesicles. You'll see the same response, >
for
> >> the?
> >> same reasons, in much petrified wood. In wood, however, there are also?
> >> remnant organic molecules that often cause pale yellow to orange?
> >> fluorescence, and in places you'll find this combined with the uranyl >
> >> green.?
> >> I've seen many samples of chalcedony that fluoresce yellow, similar to?
> >> Axel's belemnites.?
> >>?
> >> Cheers- Earl?
> >>?
> >> PS: This note has been stuck in the queue for some time now, and I've >
> >> no?
> >> idea when it will be sent. Had that same problem yesterday, too. >
> >> Apologies?
> >> if this is "old news" by the time it's posted....?
> >>?
> >>?
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