[meteorite-list] Acfer breccia

From: Fred Caillou Noir <fred_at_meteoritecentral.com>
Date: Wed, 17 Jan 2007 10:18:19 +0100
Message-ID: <006601c73a18$6e0361d0$0400a8c0_at_IBM>

Dear Rob,

One solution to have a chance to know a bit more about this meteorite could be to have its magnetic susceptibility measured. It is non destructive and can be performed on one of the small pieces that you have removed from the main mass, that you could ship to a labe able to do such an analysis, asking to get it back afterwards... Just an idea for you to get some info about your beautiful Acfer meteorite.
Should you be interested, I can let you know off list where to send it in France for instance.
Did you find this beauty by yourself in Acfer or did you buy it?
Kind regards,

Frederic
Lyon, France

----- Original Message -----
From: "Rob Lenssen" <rlenssen at planet.nl>
To: <bernd.pauli at paulinet.de>; <Meteorite-list at meteoritecentral.com>
Sent: Wednesday, January 17, 2007 12:05 AM
Subject: Re: [meteorite-list] Acfer breccia


> Thank you very much for your reaction Bernd.
>
> Like I wrote before, it was covered in desert varnish when I got it. The two
> polished planes present fractured sides, that I planed removing as less
> material as possible. Before planing they already showed dark "lumbs". Like
> it fractured "around them".
> Don't think it is planetary though, as it is magnetic and shows the typical
> (chondrite) dots of iron in the surface.
>
> I will try to make better pictures and will share them with you.
>
> regards,
> Rob
>
> ----- Original Message -----
> From: <bernd.pauli at paulinet.de>
> To: <Meteorite-list at meteoritecentral.com>
> Sent: Tuesday, January 16, 2007 10:32 PM
> Subject: Re: [meteorite-list] Acfer breccia
>
>
> Hello Rob L. and List,
>
> Look what I found after cleaning and polishing a desert varnish covered
> Acfer:
>
> http://home.planet.nl/~rlenssen/Acfer500g.htm
>
> Dark clasts in lighter matrix. Also metal spots in the dark clasts.
> Any idea what this might be? In chondrites I typically see lighter
> clasts in darker matrix.
>
>
> What a beautiful A?fer chondrite! Is it a chondrite after all? The pictures
> should
> have a higher resolution. Are there any chondrules? Questions, questions,
> questions!
>
> Anyway, it does look quite fresh, so it should be something like W1 or W2 at
> most.
> It does look highly shocked ... at least S4 but more probably S5 or even S6.
> Well,
> that sounds like silicate darkening. Maybe the silicate clasts were not so
> very dark
> prior to the shock event but experienced extensive darkening (caused by
> melting of
> metal-sulfide).
>
> As for: "In chondrites I typically see lighter clasts in darker matrix"
>
> Here are some chondrites that have dark inclusions: NWA 0869, NWA 0978,
> NWA 1794, NWA 3346, OUED EL HADJAR, RICHFIELD, TANEZROUFT 061, etc., etc.
>
> Anyway, a mighty beautiful "chondrite", something that, as Dean would now
> say
> "you just gotta love!" ... and if it is not a chondrite ??? Could this be a
> planetary meteorite??? Questions, questions, questions!
>
> Cheers,
>
> Bernd
>
>
>
>
> To: rlenssen at planet.nl
> Meteorite-list at meteoritecentral.com
>
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Received on Wed 17 Jan 2007 04:18:19 AM PST