AW: [meteorite-list] Dhofar vs. NWA meteorites

[lakewind at infionline.net]

Hi John,
These veins are exactly what I see in a lot of the Dhofars. Thank you very
much for 
your help in identifying what they really are. It makes sense that more of
them 
would be seen in Dhofar chondrites given the generally higher level of
weathering 
in them vs. the NWAs.
Best wishes,
Bob King




Original Message:
-----------------
From: JKGwilliam h3chondrite at cox.net
Date: Thu, 08 Jun 2006 21:51:08 -0700
To: pkmorgan at ctcweb.net, lakewind at infionline.net, 
Meteorite-list at meteoritecentral.com
Subject: Re: AW: [meteorite-list] Dhofar vs. NWA meteorites


Hello List,
I believe Phil is correct with his idea that the veining is really 
weathering artifacts and not actual shock veins.  It's hard to tell without 
seeing some pictures, so, below is a link to two pictures of Sacramento 
Wash 003, a new Arizona meteorite I found in the Franconia area a couple 
years back.  You can see in the lower picture (close-up) that there is a 
network of small spider web size veins that ASU confirmed as "weathering 
artifacts" and not shock veins.  Compare these to the specimens in question 
and see if you notice any simplarities.  My regular site, 
meteoriteimpact.com, is down for a few days so I uploaded the pictures to 
one of my personal sites.

http://www.jkgwilliam.com/SaW003.htm

Best,

John Gwilliam

At 08:10 PM 6/8/2006, Phil Morgan wrote:
>Hi Bob,
>Are they really shock veins or simply some sort of weathering deposit in 
>small cracks as they disintegrate into extra-terrestrial soil?
>
>I don't have any idea how this would work exactly or the substances 
>involved, but I've always thougth them to be a by-product of weathering 
>rather than shock.
>
>Regards to all,
>Phil
>----- Original Message ----- From: <lakewind at infionline.net>
>To: <Meteorite-list at meteoritecentral.com>
>Sent: Thursday, June 08, 2006 9:15 AM
>Subject: RE: AW: [meteorite-list] Dhofar vs. NWA meteorites
>
>
>Hi Martin,
>Thanks for your observations on Dhofar vs. NWA. What you wrote makes sense.
>However I still wonder why many of the Dhofar chondrites have so many fine
>shock
>veins compared to the NWAs.  Any thoughts?
>Bob
>
>
>Original Message:
>-----------------
>From: Martin Altmann altmann at meteorite-martin.de
>Date: Thu, 8 Jun 2006 14:36:29 +0200
>To: Meteorite-list at meteoritecentral.com, lakewind at infionline.net
>Subject: AW: [meteorite-list] Dhofar vs. NWA meteorites
>
>
>Hi Bob,
>
>>So we have two reasons:
>The more harsh weathering conditions in Oman
>and a economical one, that from the NWA one sees only the tip of the
>iceberg's weathering scale, cause the more rotten stuff doesn't sell.
>
>Buckleboo!
>Martin
>
>
>-
>Hi all,
>I've seen a good number of Dhofar and NWA common chondrites and
>I've noticed that there are many among the Dhofars which exhibit highly
>weathered interiors laced with rich, thread-like shock veins. These
>veins seem to be far less common in NWA chondrites and I wonder
>why. Can anyone shed light on this little mystery (for me)? Thank you!
>Bob
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