[meteorite-list] Brenham Instability Myth

From: M come Meteorite Meteorites <mcomemeteorite2004_at_meteoritecentral.com>
Date: Mon Nov 6 23:05:59 2006
Message-ID: <20061106214321.12253.qmail_at_web26203.mail.ukl.yahoo.com>

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 04:43:21 PM PST