[meteorite-list] R Chondrites and Magnetism
bernd.pauli at paulinet.de
bernd.pauli at paulinet.de
Tue May 31 10:09:16 EDT 2005
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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