Re-2: [meteorite-list] Shirokovsky etching

[mark ford]

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: bernd.pauli at paulinet.de [mailto:bernd.pauli at paulinet.de] 
Sent: Tuesday, February 08, 2005 10:46 AM
To: Meteorite-list at 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 at meteoritecentral.com
http://six.pairlist.net/mailman/listinfo/meteorite-list