[meteorite-list] PV and Iron stability

From: Steve Witt <stelor96_at_meteoritecentral.com>
Date: Mon, 15 Feb 2010 11:50:52 -0800 (PST)
Message-ID: <539247.56247.qm_at_web56406.mail.re3.yahoo.com>

Robert,

Total speculation on my part, but the Met Society states that "Etching of centimeter-sized metal areas (of PV) reveals a fine Widmanst?tten pattern, bandwidth = 0.02 to 0.81 mm (average 0.32 mm). This bandwidth is comparable to Gibeon, which has always been considered a stable iron with a nickel content of 7.8 - 12.7% (even though it has been on the ground for some time. So my thought was with the quick recovery of PV as well as the higher nickel content in the metal veins, has resulted in the iron being very stable. Just my two cents worth. Maybe the pros can weigh in.

Regards,
Steve

 

--- On Mon, 2/15/10, Robert Woolard <meteoritefinder at yahoo.com> wrote:

> From: Robert Woolard <meteoritefinder at yahoo.com>
> Subject: [meteorite-list] PV and Iron stability
> To: meteorite-list at meteoritecentral.com
> Date: Monday, February 15, 2010, 12:52 PM
> Hello,
>
> ? Thanks to everyone who responded to my question
> concerning the state of their PV specimens. Stability was
> unanimous, with no one experiencing any problems with
> rusting.? :-)
>
> ? And that brings up a related question concerning
> stability that I might should already know the answer to,
> but do not:
>
> ? Is PV's apparent rust-resistance for at least the last
> 10+ years (and hopefully many more) due SIMPLY to the fact
> that the specimens were recovered so quickly, and were
> spared exposure to, and penetration of, water for hundreds
> to thousands of years??And if so, are ALL freshly recovered
> irons (or "metal veined" as in the case of PV) just
> inherently stable?
>
> ? Or does inherent resistance to rusting vary from one
> meteorite to the next based more on the exact, specific
> chemical makeup of the iron and any particular find may or
> may not be prone to rusting regardless of how quickly it was
> recovered????
>
> ? Thanks in advance for any help with this,
> ? Robert Woolard
> ?
>
>
>
>
>
>
>
>
> ? ? ?
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Received on Mon 15 Feb 2010 02:50:52 PM PST