[meteorite-list] Brenham Instability Myth

From: Bob Evans <bobe5531_at_meteoritecentral.com>
Date: Mon Nov 6 23:27:47 2006
Message-ID: <001b01c70225$0d78e220$6400a8c0_at_yourae066c3a9b>

I agree Matteo,
I have never bought a Brenham. It would be a waste of money.
I have cleaned and sealed my Canyon Diablos, Sikhotes and Campos in exactly
the same manner.
The Cd's and Sikhotes held up well but my Campo continues to disintegrate no
matter what I do.
Those desiccant bags are useless.
The sad thing is it was my first meteorite. The reason for my obsession.
Here it is, and it isn't pretty :
( New Collectors beware. Viewing this may cause you to collect only stony
meteorites )
http://pg.photos.yahoo.com/ph/spacerox2001/album?.dir=/8a8fre2

Bob

----- Original Message -----
From: "M come Meteorite Meteorites" <mcomemeteorite2004_at_yahoo.it>
To: <Meteorite-list_at_meteoritecentral.com>
Sent: Monday, November 06, 2006 3:43 PM
Subject: Re: [meteorite-list] Brenham Instability Myth


> my Brenham slice its go totaly destroy....never buy
> another
>
> Matteo
>
> --- McCartney Taylor <mccartney_at_blackbearddata.com> ha
> scritto:
>
>> As long as Ghubara stability is being knocked
>> around, I'd like to
>> address Brenham. I'm currently writing a paper on
>> the stability of
>> Brenham, and thought I reveal a quick peek here on
>> how this pallasite is
>> actually stable.
>>
>> Brenham has acquired a bad reputation on stability.
>> This reputation is
>> more myth than fact. The myth really began with the
>> 'meteorerodes'
>> Nininger excavated from the alleged 'Haviland
>> crater'. These meteorites
>> were soaked in a nickle-leaching, electrolysis
>> accelerating soup for
>> 10,000+ years. Corrosion had already advanced to a
>> point of leaving
>> shale balls. Nininger then shared these rotten
>> pallasites with other
>> institutions. So the myth began...
>>
>> Yet, a few hundred yards away, rock stable Brenhams
>> were found (the 750
>> pounder). Hint-don't buy water logged pallasites.
>>
>> Several collectors have stable Brenhams, some with
>> and some without
>> sealing. So empirical evidence supports this
>> conclusion.
>>
>> My paper will address the fundamental corrosion of
>> all iron meteorites,
>> including Brenham. In a nutshell, its all about
>> water and oxygen.
>> Brenham is not a chloride attacked meteorite. It is
>> complicated by
>> sulfides that induce an electrolytic effect.
>> Brenham has a higher
>> porosity between the olivine and metal. If the
>> natural soil moisture
>> water is not removed effectively, they will rust.
>> If it is removed,
>> then properly sealed from Oxy and water, it's rock
>> stable. Even the
>> unaltered core of a badly eroded 'meteorerode' will
>> be stable after
>> being desiccated by vacuum then impregnate sealed
>> with Opticon.
>>
>> Anyone who doesn't seal their irons from Oxy and
>> water is playing dice
>> against time. You will lose eventually. Be it Esquel
>> or Canyon Diablo.
>> Just don't blame the iron for rusting because you
>> didn't seal it. We
>> have enough myths in this business as it is.
>>
>> McCartney Taylor, IMCA 2670
>>
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>
>
> M come Meteorite - Matteo Chinellato
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Received on Mon 06 Nov 2006 11:27:36 PM PST