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

[John.L.Cabassi]

Hi Tom,
That is very interesting. Did you find anything similar in the NWA 5000, 
just curious. You can send a pic my way. I love making a fool of myself. But 
seriously, I would like to try and give some input.

Cheers
Johnno

----- Original Message ----- 
From: <STARSANDSCOPES at aol.com>
To: <meteorite-list at meteoritecentral.com>
Sent: Saturday, August 09, 2008 3:41 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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