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...@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_collec...@yahoo.com; meteorite-list@meteoritecentral.com > From: zelimir.gabel...@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...@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. >> >> >> >> >> >> >> >> >>______________________________________________ >>Visit the Archives at >>http://www.meteoritecentral.com/mailing-list-archives.html >>Meteorite-list mailing list >>Meteorite-list@meteoritecentral.com >>http://six.pairlist.net/mailman/listinfo/meteorite-list > > Prof. Zelimir Gabelica > Université 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 > > ______________________________________________ > Visit the Archives at > http://www.meteoritecentral.com/mailing-list-archives.html > Meteorite-list mailing list > Meteorite-list@meteoritecentral.com > http://six.pairlist.net/mailman/listinfo/meteorite-list _________________________________________________________________ Hotmail: Trusted email with powerful SPAM protection. http://clk.atdmt.com/GBL/go/196390707/direct/01/ ______________________________________________ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
