[meteorite-list] NWA 969

From: STARSANDSCOPES at aol.com <STARSANDSCOPES_at_meteoritecentral.com>
Date: Sun, 5 Oct 2008 11:58:27 EDT
Message-ID: <d36.2fddb65d.361a3e23_at_aol.com>

Hi List, I got permission from Johnno to restate his email to me on the list. He noticed a change to my Gallery and he had some questions concerning microscopic examination of iron meteorites.

First off, Johnno is right, my Meteorite Times hosted Micrograph Gallery did have some changes. http://www.meteorite.com/meteorite-gallery/ Paul has set it up real cool. In the past I had Gallery posts and Micro Vision articles. The articles were in past issues of Meteorite Times. Many of the articles were material specific, that is they did not cover general microscope issues. Those materials were not represented in the Gallery. Paul made it so you can (in the Gallery) scan the alphabetical menu of all material there are images of and simply click on what you would like to see.

Second, Johnno's observation of the Brahin Pallasite shots is correct. That is a very close up view of how the rust starts to attack the irons.

Third, I have not examined highly polished iron meteorites in incident (reflected) light. Has any one done this and are crystals often visible? Perhaps with the addition of cross polarized light?

Tom Phillips

In a message dated 10/4/2008 4:30:41 P.M. Mountain Daylight Time, j.cabassi at ca.rr.com writes:
G'Day Tom
Thanks for the image of NWA 969, really incredible. I did my normal visit to your site, you changed a few things around, freaked me out for a minute, but then I calmed down. A question .. I noticed you did some photos of Brahin, being a pallasite, I can understand the possibilities of some great images and I think I mentioned before that the lines look identical to how rust starts to work it's way on a metal surface. But have you tried using your techniques on just plain iron meteorites? And is there a possibility of having microscopic crystals mixed with metal? I just got a 12+ gram slice of Georgetown, Queensland IIICD, anomalous silicated iron. It is a fascinating piece.

Cheers
Johnno




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Received on Sun 05 Oct 2008 11:58:27 AM PDT