>Steve / Steve: > > >Isn't Pyrrhotite Fe(1-x)S? > >True. Troilite is distinct from Pyrrhotite. It was simply the best >terrestrial analog, found in abundance on Earth and easily referenced, >that I could come up with at the time for S. Arnold's post. >
to be more precise there are different sorts of pyrrhotite: a first one that is very like troilite (FeS): "non magnetic" (in fact antiferromagnetic) with formula Fe9S10 and hexagonal system, and the second one (not mentionning extra and more exotic forms) Fe7S8 which is magnetic and monoclinic. The last one is more common in terrestrial rocks, but also present in SNC and Rumuritites (probably as a mixture with Fe9S10) Pierre ______________________________________________ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list
