[meteorite-list] porous chondrite - crystals in matrix

From: Phil Morgan <pkmorgan_at_meteoritecentral.com>
Date: Tue Sep 12 21:55:37 2006
Message-ID: <003e01c6d6d7$8f97a2b0$0307a8c0_at_Gateway500s>

Hello again,
Let me ask a more direct question.

Admittedly, the pictures aren't very interesting at first glance. But, with
a closer look, I'm hoping you can actually pick out the small crystals
sticking out of the matrix. I've re-read Norton's artice in the May 04
issue of Meteorite magazine and don't find any mention of this phenomenon.
Is this type of think in the matrix of most/all chondrites, just harder to
pick out of most unless in thin section?

I don't believe this piece is very weathered. I've seen very weathered NWA
material where the metal has completely oxidized and the silicates are
breaking down that almost look porous. I don't believe that to be the case
here.

Would these crystals have formed after-the-fact, or accreted along with the
chondrules? What would they be? Some are more transparent and some seem
quite black. I'm very much a newbie at the minerals.

Thanks again,
Phil

----- Original Message -----
From: "Phil Morgan" <pkmorgan_at_ctcweb.net>
To: <meteorite-list_at_meteoritecentral.com>
Sent: Monday, September 11, 2006 7:37 PM
Subject: [meteorite-list] porous chondrite


> Hello everyone,
> Great thread on Neumann lines!
>
> The list has generally been a bit quiet so thought I'd share something and
> solicite opinions.
>
> The links below (reasonable quality hopefully) are of an NWA at 20x. The
> matrix is quite porous and of a sandy texture. Anyone know of anything
> classified that might look similar? Any observations or comments?
>
> broken exterior:
> http://i25.photobucket.com/albums/c57/pkmorgan/porous%20OC/exterior.jpg
>
> cut surface:
> http://i25.photobucket.com/albums/c57/pkmorgan/porous%20OC/cut.jpg
>
> largest chondrule:
> http://i25.photobucket.com/albums/c57/pkmorgan/porous%20OC/chondrule.jpg
>
> Thanks for viewing and regards!
> Phil
>
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Received on Tue 12 Sep 2006 09:54:28 PM PDT