[meteorite-list] PV and Iron stability

[almitt2 at localnet.com]

Hi Steve,

Good to see you on the list! Best!

--AL Mitterling

Quoting Steve Witt <stelor96 at 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 
> 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 <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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>
>
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