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 ______________________________________________ Meteorite-list mailing list [email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list
