AW: [meteorite-list] John's Interesting Iron Meteorite, NWA 2677

[Jörn Koblitz]

Hello John, Mark and Martin,

>From the pictures I've seen of this nice iron meteorite, it looks to me like the kamacite bands are recrystallized. If this is just for the outer part of the meteorite, it is most likely the feat-affected zone, also called alpha-2 zone, generated during atmospheric passage of the meteoroid. For very small irons, this zone can extend some centimeters into the interior, for larger irons it is just a few millimeter. The deformations of the Widmanstätten structure is not necessarily coursed by impact on the ground, like for Gibeon, Sikhote-Alin or Henbury. It can also be pre-terretrial. If the specimen is well rounded by ablation, I think it is rather a pre-terrestrial damage.

Best regards,
Jörn


> -----Ursprüngliche Nachricht-----
> Von: Martin Altmann [mailto:Altmann at Meteorite-Martin.de]
> Gesendet: Sonntag, 12. Dezember 2004 12:02
> An: MARK BOSTICK; meteorite-list at meteoritecentral.com
> Betreff: Re: [meteorite-list] John's Interesting Iron Meteorite, NWA
> 2677
> 
> 
> Intersting to me, that some lamellae in that slice are 
> somewhat twisted from
> mechanical stress
> as one can find in many irons of large tkw, which broke up. 
> Gibeon, Henbury
> and of course from most crater builders.
> So I would bet, that there are many more specimens still to 
> be found in
> desert....
> 
> Martin
> 
> ----- Original Message ----- 
> From: "MARK BOSTICK" <thebigcollector at msn.com>
> To: <meteorite-list at meteoritecentral.com>
> Cc: <sales at arizonaskiesmeteorites.com>
> Sent: Sunday, December 12, 2004 8:23 AM
> Subject: [meteorite-list] John's Interesting Iron Meteorite, NWA 2677
> 
> 
> > Hello John and list,
> >
> > I recently picked up a small piece of NWA 2677 from John 
> Birdsell.  An
> > interesting iron meteorite of 100g. It has been 
> provisionally classified
> as
> > a "IIICD (aka: IAB subclass LM).", noted from John's 
> website. I am not
> > really an iron expert, but I guess that means fine octahedrite. The
> > meteorite itself is somewhat confusing, as the nickel 
> content doesn't seen
> > to line up well with any of the IIICD's except the Ataxites 
> I suppose, but
> > this has a obvious bold octahedrite pattern.
> >
> > I managed a pretty good photo of my slice on my collection 
> page. (I now
> have
> > studio lights and equipment...which also of course means, 
> my camera is
> > giving me problems now...:-(
> >
> > http://www.meteoritearticles.com/colnwa2677.html
> >
> > Also, John asked about possible pairs.  Doing a little 
> research on the
> iron
> > I have found the following meteorite classified somewhat close and
> location
> > of find possibly close.  Could this be a possible pair?
> >
> > Hassi-Jekna, IIICD, found El Golea, Algeria in 1890, TKW 
> 1890, Bandwidth
> > .47mm.
> >
> > Clear Skies,
> > Mark Bostick
> > www.meteoritearticles.com
> > www.kansasmeteoritesociety.com
> > www.imca.cc
> >
> >
> > ______________________________________________
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> > http://six.pairlist.net/mailman/listinfo/meteorite-list
> 
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