[meteorite-list] A question about an iron fleck in NWA 2977 Lunar

From: Roman <romanj_at_meteoritecentral.com>
Date: Sat, 9 Aug 2008 20:15:06 -0400
Message-ID: <02bb01c8fa7e$24e04540$6500a8c0_at_compaqsdg7ojf0>

Hi Tom

Please email your micrographs.
>From what I have read, the Widmanstatten pattern has plate sizes that change
in size due to the rate of cooling, so a 'mini' pattern might not be
possible. But
then again, why not at a micro scale?

Good question.

Cheers,
Roman Jirasek



----- Original Message -----
From: <STARSANDSCOPES at aol.com>
To: <meteorite-list at meteoritecentral.com>
Sent: Saturday, August 09, 2008 6:41 PM
Subject: [meteorite-list] A question about an iron fleck in NWA 2977 Lunar


> Hi list, I had a question about an iron fleck I found in a thin section
> of
> NWA 2977 Lunar. Jim Strope sent it to me.
>
> I plan to use this as next months Meteorite Times Micro Vision and want
> to
> be accurate.
>
> The thin is polished to 1/4 micron. This sometimes has the same effect
> as
> etching but on a much finer scale. I have observed it in other materials
> that
> get this kind of polish.
>
> There is a fleck of iron in this material. In this fleck is what looks
> like
> micro Widmanstatten pattern.
>
> Can this pattern be called Widmanstatten? If not, are the creation
> processes the same as with full sized Widmanstatten? How would it be
> still present
> in a lunar? Could the pattern survive a meteor collision with the moon
> and
> not be heated to the point of destruction?
>
> I would like to email micrographs to any one who is interested or, even
> better, might have the answers.
>
> The images are taken in incident cross polarized light and I am using a
> Glan/Thompson style polarizer that allows me near total extinction. I
> pull up
> the changes in the pattern by slight rotation of the polarizer. The
> magnification of these images is 1600X.
>
> Thanks, Tom Phillips





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Received on Sat 09 Aug 2008 08:15:06 PM PDT