[Rockhounds] fossils

Fri May 1 16:43:47 PDT 2009

All the Sewell Belemnites I have ever seen fluoresce a yellow white.

Gene
----- Original Message ----- 
From: "Axel Emmermann" <axel.emmermann at pandora.be>
To: "'Rockhounds at drizzle.com: A mailing list for rock and gem collectors'" 
<rockhounds at lists.drizzle.com>
Sent: Friday, May 01, 2009 10:06 AM
Subject: RE: [Rockhounds] fossils

> 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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