[meteorite-list] (no subject)

From: Mike Farmer <farmerm_at_meteoritecentral.com>
Date: Thu Apr 22 09:46:24 2004
Message-ID: <3B02F4D3.10236B61_at_concentric.net>

Also the fact the NWA 073 is a porous L chondrite and Oum Rokba is a very solid
hard H chondrite. I find the the softer Ls tend to weather much faster.
Sandblasting in some areas can remove all traces of fusion crust, but leave a
meteorite little weathered, while one buried in sand or soil can retain it's
crust but be quite weathered.
Mike Farmer

entropydave wrote:

> Hello,
> I wonder if you could help me regarding weathering grade...
> I have a couple of rocks that are weathering grade 2 (Oum Rokba) andMWA073
> with weathering grade 3.
> See pics below please!
> http://www.meteorites.ic24.net/nwa073.htm
>
> As you can see it apparently has a nice glossy (slightly worn) fusion crust.
> I don't have a pic of the Oum Rokba, but it has that finish that seems to be
> typical of all the other specimens I have seen.. It seems to have a classic
> desert varnish (ie no F/C) yet it's weathering grade is LOWER than the
> NWA073.
> Am I misunderstanding the process of weathering grading?
>
> Thanks in anticipation for your erudite comments!
> --
> In gentle decay,
> d.
>
> http://www.meteorites.ic24.net/index.html
>
> http://www.thc.u-net.com/davethc1.htm
>
> "I have a proof that x^n+y^n=z^n never has integer solutions for n>2.
> However, it won't fit into my signature file...."
>
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Received on Wed 16 May 2001 05:44:52 PM PDT