[Rockhounds] fossils

Wed Apr 29 20:20:06 PDT 2009

I just sent a comment on the Sewell belemnites. But for general 
consideration the vast majority of  belemnite specimens I've seen are 
calcite. I collect fossils and Fluorescents... and fossils with unusual 
mineral replacements so I am always checking out my fossils with the UV 
lamps. I use a 3 wavelength lamp just so I don't miss anything.

Gene Hartstein

----- Original Message ----- 
From: <betdav97 at aol.com>
To: <rockhounds at lists.drizzle.com>
Sent: Wednesday, April 29, 2009 10:06 AM
Subject: Re: [Rockhounds] fossils

> Didn't mean to correct you Kreigh. I was just trying to point
> out that not all belemnites are chalcedony. Gene Hartstein
> should have weighed in on this but hasn't, I was hoping for
> a good fluorescent discussion, but that didn't happen either,
> 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 11:54 pm
> Subject: Re: [Rockhounds] fossils
>
>
> A fossil expert I am not.?
> ?
> I collect fossils when I run across them looking for minerals. I'm happy 
> if I can identify fossils to genus.?
> ?
> Discovering my belimnites glowed cream-yellow big time under SW was a new 
> discovery (there was a hint of red-orange under LW).?
> ?
> Kreigh?
> ?
> ?
> On Tuesday, Apr 28, 2009, at 22:21 America/Detroit, betdav97 at aol.com 
> wrote:?
> ?
>> 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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