I agree, this etching shows that the metal cooled way too quickly, and even seems to illustrate how it was made, chunks of Iron/Nickel etc were dropped into molten Iron, the large chunks that show up when etched are probably the very same iron chunks that never quite mixed into the rest of the metal, hence you get 'Zoning' when etched ....
MF -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Tuesday, February 08, 2005 10:46 AM To: Meteorite-list@meteoritecentral.com Subject: Re-2: [meteorite-list] Shirokovsky etching > My question is what it is ? Why this pattern looks like this ? > http://www.meteoryt.net/ebay/shirokovsky_112a.jpg > http://www.meteoryt.net/ebay/shirokovsky_112b.jpg > http://www.meteoryt.net/ebay/shirokovsky_112c.jpg > http://www.meteoryt.net/ebay/shirokovsky_112d.jpg Hello All, A genuine Widmannstätten pattern can only develop if the cooling process is long and slow enough. This Shirokovsky pseudopallasite cooled too quickly. Cheers, Bernd ______________________________________________ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list ______________________________________________ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
