[Rockhounds] fossils

[Axel Emmermann]

Really Kreigh... you should stick EVERYTHING under the UV-lamp.
You never know what may fluoresce...
I had a friend who had a argument with his wife because he wanted to test
her for fluorescence... May sound weird but yes, us fanatics are out there
;-)))

Axel

> -----Oorspronkelijk bericht-----
> Van: rockhounds-bounces at lists.drizzle.com
[mailto:rockhounds-bounces at lists.drizzle.com]
> Namens Kreigh Tomaszewski
> Verzonden: woensdag 29 april 2009 1:47
> Aan: Rockhounds at drizzle.com: A mailing list for rock and gem collectors
> Onderwerp: 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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