[Rockhounds] fossils

[Gene Hartstein - Fossilnut.com]

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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