[meteorite-list] R Chondrites and Magnetism

From: M come Meteorite Meteorites <mcomemeteorite2004_at_meteoritecentral.com>
Date: Tue May 31 13:48:04 2005
Message-ID: <20050531174755.50621.qmail_at_web26205.mail.ukl.yahoo.com>

I have just tested Saturday in a mineral show some
fragments of R chondrite, the magnet is not attract,
and I have a strong magnet.....

Matteo

--- Tom Knudson <peregrineflier_at_npgcable.com> ha
scritto:
> 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
> >
> > ______________________________________________
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> >
>
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> >
> >
> >
> > --
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>
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M come Meteorite - Matteo Chinellato
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Received on Tue 31 May 2005 01:47:55 PM PDT