[meteorite-list] Acfer breccia

From: Rob Lenssen <rlenssen_at_meteoritecentral.com>
Date: Wed, 17 Jan 2007 11:34:45 +0100
Message-ID: <006201c73a23$1d6149d0$9600000a_at_EIGENAARNJEQJY>

Dear Frederic,

Thanks for the tip. I read about the method at
http://www.caillou-noir.com/magnetic-susceptibility_SM30.htm . Glad to see
there is a non destructive method to learn a bit more about a meteorite.

No, I did not find this one myself. The closest I have ever been to the
Sahara was Gibraltar :-) . Saw Africa across the sea, but have never been
there....
Actually I bought this one at the 2003 Gifhorn Fair. I was told it was found
by two French meteorite hunters. Might it be you who found it???

Kind regards,
Rob


----- Original Message -----
From: "Fred Caillou Noir" <fred at caillou-noir.com>
To: "Rob Lenssen" <rlenssen at planet.nl>; <bernd.pauli at paulinet.de>;
<Meteorite-list at meteoritecentral.com>
Sent: Wednesday, January 17, 2007 10:18 AM
Subject: Re: [meteorite-list] Acfer breccia


> 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 05:34:45 AM PST