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

[Roman]

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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