[meteorite-list] R Chondrites and Magnetism
From: Tom Knudson <peregrineflier_at_meteoritecentral.com>
Date: Tue May 31 13:18:17 2005 Message-ID: <005c01c56604$bb9c9270$2d107918_at_Michelle> Hello List, this has been very educational and I would like to thank everyone! So, most R's have enough metal to be attracted to a powerful enough magnet, while a couple have quite a bit of iron, my question has been answered If I had a big enough collection, I would not have to ask the list for help, I would just check my self, so I am sure glad you all helped! Now, I have to go back and read through all of these emails and websites to see if I can find out why R's have so little metal. Thanks, Tom peregrineflier <>< ----- Original Message ----- From: <bernd.pauli_at_paulinet.de> To: <Meteorite-list_at_meteoritecentral.com> Sent: Tuesday, May 31, 2005 7:09 AM Subject: [meteorite-list] R Chondrites and Magnetism > Hi Tom and List, > > Here is an excerpt from the "good old" RFS: > > NORTON O.R. (1998) Rocks From Space, pp. 190-191: > > and iron-nickel metal is nearly absent. Most of the metal is in the sulfides > pyrrhotite (FeS) and pentlandite [(Fe,Ni9)S8] or combined with olivine. The > pyrrhotite is magnetic, giving the meteorites a *w e a k m a g n e t i c > a t t r a c t i o n*. The fayalite content averages about Fa39, which is the > highest iron-bearing olivine content of any of the chondrites and is chemically > the most distinctive characteristic. Rumurutiites have the highest iron oxidation > of the chondrite class. > > see also: > > BLAND P. et al. (1992a) A unique type 4 chondrite from the > Sahara - Acfer 217 (abs. Meteoritics 27, 1992, 204-205): > > "Acfer 217 is a chondrite that is exceptionally poor in metal and > sulfide and rich in oxidised Fe. It appears to be unique ..." > > and also: > > SCHULZE H. et al. (1994) Mineralogy and chemistry of Rumuruti: > The first meteorite fall of the new R chondrite group > (Meteoritics 29-2, 1994, pp. 275-286): > > "Meteorites of this new group can be characterized as > oxidized, olivine-rich, metal-poor chondrites, ..." > > And, as Buckleboo Martin wrote: No metal or hardly any metal > automatically implies no magnetism or extremely weak magnetism. > > > Best wishes, > > Bernd > > ______________________________________________ > Meteorite-list mailing list > Meteorite-list_at_meteoritecentral.com > http://six.pairlist.net/mailman/listinfo/meteorite-list > > > > -- > No virus found in this incoming message. > Checked by AVG Anti-Virus. > Version: 7.0.322 / Virus Database: 267.3.0 - Release Date: 5/30/2005 > > Received on Tue 31 May 2005 01:18:15 PM PDT |
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