[meteorite-list] [met-list] Fwd: sharp protrusion from an iron meteorite

From: Jason Utas <meteoritekid_at_meteoritecentral.com>
Date: Fri, 8 Mar 2013 19:47:06 -0800
Message-ID: <CABEOBj+JHutPr+uWharLNu=Aonbo2kFEmYFcDZSwG20hQk=TEw_at_mail.gmail.com>

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 <bolidechaser at 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 Urua?u are actual iron meteorites that are
> compositionally similar to Campo del Cielo, but are not at all similar structurally.
> Urua?u is a schreibersite-cohenite-rich IAB that is older than Campo.
> Urua?u 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.jones at iscs.com> wrote:
>
>> From: Art Jones <art.jones at iscs.com>
>> Subject: Re: [meteorite-list] Fwd: sharp protrusion from an iron meteorite
>> To: "Jason Utas" <meteoritekid at gmail.com>, "Meteorite-list" <meteorite-list at meteoritecentral.com>, "altmann at meteorite-martin.de" <altmann at 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 <korotev at wustl.edu>
>> >>>>>> > To: meteorite-list at 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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Received on Fri 08 Mar 2013 10:47:06 PM PST