Hello Adam, All, Actually, Uruacu does appear to be distinct from Campo del Cielo. Uruacu appears to be a much older meteorite that has weathered in different conditions, and many individuals show cohenite when cut -- a mineral I have never seen in Campo del Cielo. Generally speaking, Campos run the full range from freshly-fusion crusted to rusty lumps, and everything in-between. But, Campo fell within the past ~5,000 years, so we're talking about rapid weathering in a wet environment (also why it's a ruster). Uruacu fell in a drier area, and most individuals exhibit a much more uniform covering of shale that does not readily flake off due to rusting. They seem to have fallen much longer ago, and are generally more weathered due to the fact that they've been around for longer. Uruacu generally resists rusting better.
It would be like comparing Sikhote Alin to Henbury. No Henburies I know of rust, but, by and large, they're not as fresh as most Sikhotes. But some Sikhotes appear to have fallen into swampy areas and look pretty bad -- and rust. It's hard to mix the two up. The trouble is that I've also seen Campos sold as Uruacu, which complicates things. Uruacu is a very old fall. Even some reputable dealers have been selling specimens of "new Campo" (crust, regmaglypts) as Uruacu. Very different. I assume this is due to dishonest suppliers. There's a stunning, fairly large Uruacu for sale at the moment. Not mine, but I wonder if this will bring it out of the woodwork. Regards, Jason > From: Adam Hupe <raremeteori...@yahoo.com> > Date: Wed, Feb 27, 2013 at 2:59 PM > Subject: Re: [meteorite-list] sharp protrusion from an iron meteorite > To: Adam <meteorite-list@meteoritecentral.com> > > > > Isn't Baygorria another meteorite with a fake provenance? Basically a > cleaned up Campo with a delaminated section protruding after a > not-so-careful makeover. I would just tell him to seek first aid so he > doesn't catch the dreaded Lawrencite disease. > > Adam > > > > > ----- Original Message ----- > From: Randy Korotev <koro...@wustl.edu> > To: meteorite-list@meteoritecentral.com > Cc: > Sent: Wednesday, February 27, 2013 2:41 PM > Subject: [meteorite-list] sharp protrusion from an iron meteorite > > I recieved a well prepared letter from a fellow with a question that I can't > begin to answer. Maybe someone on the list has seen this kind of thing > before. > > He bought a Baygorria (Iron, IAB complex) from a dealer 3 years ago. He > picked it up recently to find a metal protrusion sticking out of the thing > that was sharp enough to prick his thumb. > > Here's a jpg of his scanned photo. > > http://meteorites.wustl.edu/baygorria.jpg > > What's happened here? > > Randy Korotev > St. Louis > > ______________________________________________ > > Visit the Archives at http://www.meteorite-list-archives.com > Meteorite-list mailing list > Meteorite-list@meteoritecentral.com > http://six.pairlist.net/mailman/listinfo/meteorite-list > > ______________________________________________ > > Visit the Archives at http://www.meteorite-list-archives.com > Meteorite-list mailing list > Meteorite-list@meteoritecentral.com > http://six.pairlist.net/mailman/listinfo/meteorite-list > ______________________________________________ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
