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 Widmanst�tten >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, J�rn > -----Urspr�ngliche Nachricht----- > Von: Martin Altmann [mailto:[EMAIL PROTECTED] > Gesendet: Sonntag, 12. Dezember 2004 12:02 > An: MARK BOSTICK; [EMAIL PROTECTED] > 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" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Cc: <[EMAIL PROTECTED]> > 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 > > > > > > ______________________________________________ > > Meteorite-list mailing list > > [EMAIL PROTECTED] > > http://six.pairlist.net/mailman/listinfo/meteorite-list > > ______________________________________________ > Meteorite-list mailing list > [EMAIL PROTECTED] > http://six.pairlist.net/mailman/listinfo/meteorite-list > ______________________________________________ Meteorite-list mailing list [EMAIL PROTECTED] http://six.pairlist.net/mailman/listinfo/meteorite-list
