[meteorite-list] Zacatecas (1792) on ebay

From: Jason Utas <meteoritekid_at_meteoritecentral.com>
Date: Mon, 18 May 2009 00:09:42 -0700
Message-ID: <93aaac890905180009j24508b38ie46da014eaacfc50_at_mail.gmail.com>

Hello Mirko,
Without ever having seen a piece of Zacatecas 1792, I would side with
you; the piece of Zacatecas listed on the website does look exactly
like the 1969 mass. That said, the picture that I posted of the whole
mass:

http://commons.wikimedia.org/wiki/File:Zacatecas_(1792)_meteorite.jpg

Is NOT of the 1969 mass. That is the 1792 mass.
But as I said, I couldn't find a picture of an etched slice of the
1792 mass other than the ones you posted on ebay.
Regards,
Jason

On Mon, May 18, 2009 at 12:03 AM, Mirko Graul <m_graul at yahoo.de> wrote:
>
> .......oh,a discussion about my iron at ebay.
>
> Hi Mike and Jason,
>
> Zacatecas (1792) is not the same as Zacatecas (1969).
> All the photos were shown is Zacatecas (1969).
> That is a strong recrystallized iron and easy to recognize.
> I think(and not only think) i am sure,that the photo in
> encyclopedia of meteorites is a mistake.
> Don, what do you think?
>
> My Zacatecas 1792 is real.
> I have it from a German dealer.
> And this dealer is certainly the same source, where her other collectors piece for the collection have received.
> Perhaps even someone a picture for all present here for comparison.
>
> Many greetings Mirko
>
>
>
> Mirko Graul Meteorite
> Quittenring.4
> 16321 Bernau
> GERMANY
>
> Phone: 0049-1724105015
> E-Mail: m_graul at yahoo.de
> WEB: www.meteorite-mirko.de
>
> Member of The Meteoritical Society
> (International Society for Meteoritics and Planetery Science)
>
> IMCA-Member: 2113
> (International Meteorite Collectors Association)
>
>
> --- Michael Fowler <mqfowler at mac.com> schrieb am Mo, 18.5.2009:
>
>> Von: Michael Fowler <mqfowler at mac.com>
>> Betreff: Re: [meteorite-list] Zacatecas (1792) on ebay
>> An: meteorite-list at meteoritecentral.com
>> CC: "Michael Fowler" <mqfowler at mac.com>
>> Datum: Montag, 18. Mai 2009, 7:36
>> Thanks Jason,
>>
>> Don Edwards has a photo in the encyclopedia of meteorites,
>> but it is not very clear.? I was trying to decide if it
>> was the re-crystalized 1969 Zacatecas or the 1792 one.
>> I'm inclinded to think it is the 1792 Zacatecas, but there
>> is room for confusion.
>>
>> http://www.encyclopedia-of-meteorites.com/test/Zacatecas1792_don_edwards.jpg
>>
>> Mike
>>
>> > Hello Mike,
>> > Indeed, that's not a piece of the more common
>> Zacatecas (1969).
>> > See here; that iron is clearly recrystallized:
>> >
>> > http://www.nyrockman.com/museum/zacatecas-1462.htm
>> >
>> > While I haven't been able to find a picture of the
>> etch of the
>> > Zacatecas (1792) iron, I was able to find this picture
>> of the main
>> > mass:
>> >
>> > http://commons.wikimedia.org/wiki/File:Zacatecas_(1792)_meteorite.jpg
>> >
>> > There is more than one Zacatecas!
>> > Regards,
>> > Jason
>> >
>> > On Sun, May 17, 2009 at 9:52 PM, Michael Fowler
>> <mqfowler at mac.com> wrote:
>> >
>> > > I collect ungrouped irons, and am looking for a
>> slice of Zacatecas (1792) an
>> > > ungrouped iron.
>> > > The specimen on ebay:
>> >
>> > > http://cgi.ebay.com/Meteorite-ZACATECAS-1792-perfect-etched-slice-12-3g_W0QQitemZ270389277772QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3ef474f44c&_trksid=p3286.c0.m14&_trkparms=66%3A2%7C65%3A3%7C39%3A1%7C240%3A1318%7C301%3A1%7C293%3A5%7C294%3A50#ebayphotohosting
>> >
>> >
>> > > does not in my opinion look like the photo in
>> Buchwald, or match his
>> > > description:
>> > >
>> > > "Zacatecas is remarkable in that it belongs to
>> the rather few
>> > > polycrystalline iron meteorites.? The grain
>> size ranges from 1 to 5 cm, a
>> > > variation which is partly due to the random
>> sectioning through many almost
>> > > equiaxial grains.
>> .......???The grain boundaries are also
>> conspicuous
>> > > because of the copious development of very
>> irregular 1-3 mm wide zones of
>> > swathing kamacite.? This kamacite was nucleated
>> by the troilite and
>> >
>> > > schreibersite precipitates, and by the boundary
>> itself, and grew
>> > > significantly before the bulk of the grains
>> transformed during the primary
>> > > cooling period.
>> > > ......
>> > > Zacatecas may have shown a kamacite bandwith ot
>> one time of .6 -1.0 mm, but
>> > > since all taenite eventually disappeared and
>> significant grain growth in the
>> > > kamacite took place, no well defined
>> Widmanstatten pattern is present now.
>> > >? In this respect, Zacatecas resembles New
>> Baltimore, Santa Rosa and
>> > > Chihuahua City."
>> > >
>> > > So in short, no well defined Widmanstatten
>> pattern, unlike the photo in the
>> > > ebay ad.
>> >
>> > > Would anyone like to comment?
>> >
>> > > Thanks,
>> >
>> > > Mike Fowler
>> >
>> > > Chicago
>>
>>
>> >
>> ebay--starsandrocks______________________________________________
>> http://www.meteoritecentral.com
>> Meteorite-list mailing list
>> Meteorite-list at meteoritecentral.com
>> http://six.pairlist.net/mailman/listinfo/meteorite-list
>>
>
>
>
> ______________________________________________
> http://www.meteoritecentral.com
> Meteorite-list mailing list
> Meteorite-list at meteoritecentral.com
> http://six.pairlist.net/mailman/listinfo/meteorite-list
>
Received on Mon 18 May 2009 03:09:42 AM PDT