[meteorite-list] Zacatecas (1969) iron

From: Timothy Heitz <midwest_at_meteoritecentral.com>
Date: Mon, 18 May 2009 10:23:06 -0500
Message-ID: <9FBC56079CAB4A8A9BF5C008AF07367F_at_hal>

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_graul at yahoo.de>
To: "Michael Fowler" <mqfowler at mac.com>
Cc: <meteorite-list at 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_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
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Received on Mon 18 May 2009 11:23:06 AM PDT