[meteorite-list] Pairing discussion/questions

From: Greg Stanley <stanleygregr_at_meteoritecentral.com>
Date: Mon, 18 Jan 2010 10:20:59 -0800
Message-ID: <SNT117-W10A7BAF8CDD8B8333D9B26D2660_at_phx.gbl>

Zelimir:

So it's possible all the classifications (shown below) are from the same fall?? And perhaps from the same large mass?

Thanks,


> NWA 4857 (Algeria, Shergottite enr maf), 0.928 g in collection; tkw:1 at 24 g:
>
> ....Paired with NWA 2975 (70.1 g), NWA 2986
> (170 g), NWA 2987 (82 g), NWA 4766 (225 g), NWA
> 4783 (120 g), NWA 4864 (94 g), NWA 4878 (130 g),
> NWA 4880 (81.6 g), NWA 4930 (117.5 g), NWA 5140
> (7.5 g), NWA 5214 (50.7 g), NWA 5219 (60 g),
> NWA5313 (5.3 g) and NWA 5366 (39.6 g).
> Cumulated tkw: 1273.3 g (as per Jan. 2010)


----------------------------------------
> Date: Mon, 18 Jan 2010 18:46:15 +0100
> To: star_wars_collector at yahoo.com; meteorite-list at meteoritecentral.com
> From: Zelimir.Gabelica at uha.fr
> Subject: Re: [meteorite-list] Pairing discussion/questions
>
> Hi Greg,
>
> This might be a typical question for Jeff Grossman.
>
> I am also continuously puzzled by the abundance
> of paired meteorites (thus those that are officially recognized as such).
>
> Let's suppose that once one (or a few)
> meteorite(s) are selected from an important lot
> (as found) and sold to someone, this someone
> (scientist, collector....) would envisage its classification.
> And the same will possibly happen with the other meteorites from the same lot.
> As a result, there will be as many different NWA
> numbers, as independent classifications (of the - probably- same meteorite).
> As most of these classifications probably won't
> be concerted, there will not be pairings reported
> and we will end up with as many different
> meteorites, most probably of the same type, that
> will never be suspected being paired.
>
> If a pairing is suspected, I believe this results
> from "concerted" analyses (of either meteorites
> stemming from the same lot and analyzed by
> different groups, or of the same meteorites
> provided by different finders (buyers....)
> brought for analysis to the same group).
>
> This even complicates further if there are more
> than one such "lot" found (meteorite shower
> spread throughout a large strewnfield).
>
> In case of such "concerted" analyzes, I guess
> that the labs will still give a different NWA
> number to each meteorite (or group of meteorites
> from the same lot) analyzed, because one is never
> sure that 2 meteorites supposed to come from the
> same lot are at 100% the same.
> If pairing is reported, then most of the time
> (not always) it is mentioned in the Met. Bulls.
> But because all analyzes were done independently,
> each analyzed meteorite (or group of meteorites
> from the same verified lot) will receive its own NWA number.
>
> Here I realize that, at that stage, it is very
> difficult to decide to only retain as official
> the first NWA number attributed chronologically
> and to cancel all the next NWA numbers.
>
> I for one am just happy when pairings are
> reported. This is often the case for "important"
> types such as the planetaries.
> But for the "common" H6's or L5's, I believe this is very seldom done.
>
> So far, regarding my collection catalogue, here
> is what I mention (for my NWA 4857 sample taken
> as an example), just to have an idea of the total
> mass of that meteorite evaluated so far.
>
> NWA 4857 (Algeria, Shergottite enr maf), 0.928 g in collection; tkw:1 at 24 g:
>
> ....Paired with NWA 2975 (70.1 g), NWA 2986
> (170 g), NWA 2987 (82 g), NWA 4766 (225 g), NWA
> 4783 (120 g), NWA 4864 (94 g), NWA 4878 (130 g),
> NWA 4880 (81.6 g), NWA 4930 (117.5 g), NWA 5140
> (7.5 g), NWA 5214 (50.7 g), NWA 5219 (60 g),
> NWA5313 (5.3 g) and NWA 5366 (39.6 g).
> Cumulated tkw: 1273.3 g (as per Jan. 2010)
>
> I know that this neither sheds more light to the
> problem, nor answers your concerns.
> Hopefully someone can add more to the issue.
>
> My best,
>
> Zelimir
>
>
> At 17:09 18/01/2010, Greg Catterton wrote:
>>I have often wondered and after some discussion
>>with others I wanted to get the community feeling on the issue of pairings.
>>
>>If a meteorite say NWA 1877 for example is out
>>there and more is recovered and verified to be
>>the same material from the same strewnfield,
>>should the new material share the NWA number and the TKW be updated?
>>I have noticed many pairings with NWA 1877 and many other meteorites.
>>Same material with different numbers and TKWs listed.
>>
>>Would it not be in the best interest to have all
>>the paired samples share on number? This would
>>surely cut the amount of NWA material by 1000 or more.
>>Why is this not done?
>>
>>What is the process for pairing material to share the NWA number?
>>Is it up to the dealer or the person who did testing?
>>
>>What affect would it have on value if something
>>with a listed TKW of 200g suddenly was paired
>>with the 3 other numbers assigned to the same
>>material and the TKW was pushed to 1kg or more?
>>Surely it would decrease as supply grew. Is this a concern for some?
>>
>>I am trying to better understand the
>>politics/red tape that goes with this area.
>>
>>Thanks, hope everyone is doing well.
>>
>>Greg C.
>>
>>
>>
>>
>>
>>
>>
>>
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>
> Prof. Zelimir Gabelica
> Universit? de Haute Alsace
> ENSCMu, Lab. GSEC,
> 3, Rue A. Werner,
> F-68093 Mulhouse Cedex, France
> Tel: +33 (0)3 89 33 68 94
> Fax: +33 (0)3 89 33 68 15
>
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Received on Mon 18 Jan 2010 01:20:59 PM PST