Hello Mike and Jason,
I have a close-up picture of the recrystallized Zacatecas 1969 iron here.
http://www.meteorman.org/Zacatecas.htm
Tim Heitz
Midwest Meteorites - http://www.meteorman.org/
----- Original Message -----
From: "Mirko Graul" <m_gr...@yahoo.de>
To: "Michael Fowler" <mqfow...@mac.com>
Cc: <meteorite-list@meteoritecentral.com>
Sent: Monday, May 18, 2009 2:03 AM
Subject: Re: [meteorite-list] Zacatecas (1792) on ebay
.......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_gr...@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 <mqfow...@mac.com> schrieb am Mo, 18.5.2009:
Von: Michael Fowler <mqfow...@mac.com>
Betreff: Re: [meteorite-list] Zacatecas (1792) on ebay
An: meteorite-list@meteoritecentral.com
CC: "Michael Fowler" <mqfow...@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______________________________________________
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