Hi Steve,
Good to see you on the list! Best!
--AL Mitterling
Quoting Steve Witt <[email protected]>:
Robert,
Total speculation on my part, but the Met Society states that
"Etching of centimeter-sized metal areas (of PV) reveals a fine
Widmanstätten 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 <[email protected]> wrote:
From: Robert Woolard <[email protected]>
Subject: [meteorite-list] PV and Iron stability
To: [email protected]
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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