[meteorite-list] Acfer breccia

[Rob Lenssen]

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 Açfer 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

>>

>> ______________________________________________

>> Meteorite-list mailing list

>> Meteorite-list at meteoritecentral.com

>> http://six.pairlist.net/mailman/listinfo/meteorite-list

>>

>> ______________________________________________

>> Meteorite-list mailing list

>> Meteorite-list at meteoritecentral.com

>> http://six.pairlist.net/mailman/listinfo/meteorite-list

>