[meteorite-list] R Chondrites and Magnetism
From: bernd.pauli_at_paulinet.de <bernd.pauli_at_meteoritecentral.com>
Date: Tue May 31 14:48:46 2005 Message-ID: <DIIE.00000035000038C0_at_paulinet.de> Tom concluded: > So, most R's have enough metal to be > attracted to a powerful enough magnet Careful, please. I'd like to add the little word "just", leave out the word "most" and replace it by "some": > Some R's have j u s t enough metal to be > attracted to a powerful enough magnet ... This sounds better because almost all the iron is oxidized and also FeNi (nickel-iron) is extremely rare (only some tens of parts per million!) In his Cambridge Encyclopedia, O.R. Norton writes on p. 116: "There is almost no free iron metal (a few grains here and there) ..." > ... if I can find out why R's have so little metal. Oxidation (water was the oxidizing agent): Step 1: extensive aqueous alteration on the R parent body Step 2: dehydration (removal of water) + thermal metamorphism Best wishes, Bernd Received on Tue 31 May 2005 02:48:44 PM PDT |
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