Re-2: [meteorite-list] Shirokovsky etching

From: mark ford <markf_at_meteoritecentral.com>
Date: Tue Feb 8 06:41:08 2005
Message-ID: <6CE3EEEFE92F4B4085B0E086B2941B31244BB4_at_s-southern01.s-southern.com>

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@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 Widmannst?tten 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
Received on Tue 08 Feb 2005 06:37:50 AM PST