[Rockhounds] fossils

[Axel Emmermann]

Indeed, Kreigh!
Fluorescence is a tricky indicator at times.
Not very reliable!	

Axel

> -----Oorspronkelijk bericht-----
> Van: rockhounds-bounces at lists.drizzle.com
[mailto:rockhounds-bounces at lists.drizzle.com]
> Namens Kreigh Tomaszewski
> Verzonden: donderdag 30 april 2009 2:56
> Aan: Rockhounds at drizzle.com: A mailing list for rock and gem collectors
> Onderwerp: Re: [Rockhounds] fossils
> 
> Except for very rare cases, knowing that a specimen fluoresces does not
> help me identify what minerals are in the specimen.
> 
> Kreigh
> 
> 
> On Wednesday, Apr 29, 2009, at 13:27 America/Detroit, Axel Emmermann
> wrote:
> 
> > 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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