Hello Bob, All,
Metal protrusions like that are common on cleaned irons. They are
usually slivers of fresh metal formerly surrounded by oxide that are
exposed via cleaning.
Since we have no evidence that Baygorria is or ever was actually
distinct from Campo del Cielo, I wouldn't be so bold as to say that
the original mass was a distinct meteorite. It might have been, but
you assert it as though it's fact. I would disagree without
additional evidence.
I agree. Self-pairing when there's any question of the material being
different is a no-no.
Regards,
Jason
On Fri, Mar 8, 2013 at 5:02 PM, Robert Verish bolidecha...@yahoo.com wrote:
Except that I can't remember if we identified the protrusion.
Long ago I remember someone suggesting that it might be a mineral inclusion
that is differentially resistant to weathering, like silicates, or carbides,
like the cohenite in this image:
http://www.mindat.org/photo-8081.html
But then the ID of the iron meteorite, itself, was brought into question.
In recap, here is what we know:
Baygorria and Uruaçu are actual iron meteorites that are
compositionally similar to Campo del Cielo, but are not at all similar
structurally.
Uruaçu is a schreibersite-cohenite-rich IAB that is older than Campo.
Uruaçu was found in Brazil; is unrelated to Baygorria (Uruguay) or Campo.
Baygorria was found as a single mass (80 kg) that was cut into slices and the
largest remaining mass (40kg) was donated to a university. Individual
meteorites sold as 'Baygorria' are nothing more than Campo del Cielo from
Argentina.
These bogus whole irons need to be relabeled as Campo del Cielo.
Even 'Baygorria' slices are suspect Campo unless it can be proven that
provenance originated from the university or from Mr. J. Escomel, Roque Gra
Seras 914, Montevideo 11300, Uruguay.
Anything less would be considered self-pairing which we now know is a
slippery-slope.
Just my way of throwing dirt on the grave of the dead horse.
Bob V.
--- On Fri, 3/8/13, Art Jones art.jo...@iscs.com wrote:
From: Art Jones art.jo...@iscs.com
Subject: Re: [meteorite-list] Fwd: sharp protrusion from an iron meteorite
To: Jason Utas meteorite...@gmail.com, Meteorite-list
meteorite-list@meteoritecentral.com, altm...@meteorite-martin.de
altm...@meteorite-martin.de
Date: Friday, March 8, 2013, 1:34 PM
Guys,
I think the horse is way past dead on this one, let's end
the thread.
Thanks, Art
++
- 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
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