Pete, That's right, no evidence for an angrite composition on the surface of Mercury -- at least not yet. Angrites have far too much FeO in the silicates to match the spectra of Mercury. Also, angrites are among the oldest igneous rocks in the solar system (SAH 99555 is probably the oldest known igneous rock), and you would expect to see somewhat younger ages from a planet (like Mercury or Mars) or even a large body like our Moon -- it takes millions of years to differentiate and form a crust.
Who knows, maybe some aubrites are from Mercury, or maybe we need to keep searching! Best regards, Carl Agee -- Carl B. Agee Director and Curator, Institute of Meteoritics Professor, Earth and Planetary Sciences MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 Tel: (505) 750-7172 Fax: (505) 277-3577 Email: a...@unm.edu http://meteorite.unm.edu/people/carl_agee/ --------------------------- Message: 2 Date: Mon, 24 Sep 2012 14:09:30 -0400 From: Pete Pete <rsvp...@hotmail.com> Subject: [meteorite-list] Enstatite Connection to Mercury To: meteoritelist meteoritelist <meteorite-list@meteoritecentral.com> Message-ID: <bay153-w19b649238a92acc6a2aa84f8...@phx.gbl> Content-Type: text/plain; charset="iso-8859-1" Hi, All, I just came across this: Mercury's Surface Resembles Rare Meteorites http://www.space.com/17727-mercury-surface-rare-meteorites.html http://www.space.com/17727-mercury-surface-rare-meteorites.html ..."The surface is dominated by minerals high in magnesium and enriched in sulfur, making it similar to partially melted versions of an enstatite chondrite, a rare type of meteorite that formed at high temperatures in low-oxygen conditions in the inner solar system." (The price of enstatites just went up!;)) Unless I've missed it, there hasn't been any connection of angrites to Mercury come out of Messenger's analysed data, correct? It's safe to assume angrites have an unknown source but not Mercury, at this time? Best, Pete ------------------------------ ______________________________________________ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
