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" <[EMAIL PROTECTED]> To: "Rob Lenssen" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>; <[email protected]> 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" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]>; <[email protected]> > 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: <[EMAIL PROTECTED]> >> To: <[email protected]> >> 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: [EMAIL PROTECTED] >> [email protected] >> >> ______________________________________________ >> Meteorite-list mailing list >> [email protected] >> http://six.pairlist.net/mailman/listinfo/meteorite-list >> >> ______________________________________________ >> Meteorite-list mailing list >> [email protected] >> http://six.pairlist.net/mailman/listinfo/meteorite-list > ______________________________________________ Meteorite-list mailing list [email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list
