.......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: [email protected]
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 <[email protected]> schrieb am Mo, 18.5.2009:
> Von: Michael Fowler <[email protected]>
> Betreff: Re: [meteorite-list] Zacatecas (1792) on ebay
> An: [email protected]
> CC: "Michael Fowler" <[email protected]>
> 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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