[meteorite-list] Brenham Instability Myth

From: Rob McCafferty <rob_mccafferty_at_meteoritecentral.com>
Date: Tue Nov 7 06:23:32 2006
Message-ID: <20061107112330.71210.qmail_at_web50909.mail.yahoo.com>

It is nice to know that the pile of rust and olivine I
have visibly decaying away in my collection is only
doing so mythically.

Rob McC
>
> --- 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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> > Meteorite-list_at_meteoritecentral.com
> >
>
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> >
>
>
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Received on Tue 07 Nov 2006 06:23:30 AM PST