[meteorite-list] Andi's Recrystallized NWA iron

From: Mike Fowler <mqfowler_at_meteoritecentral.com>
Date: Tue, 25 Sep 2007 11:29:38 -0500
Message-ID: <6DEF4D16-B9F8-48E1-A87A-4C32CCE9CA40_at_mac.com>

> Hello Andi, Mike and List,
>
> Those interested in an iron that will be extremely difficult to
> classify
> had better hurry because Andi is almost sold out. I am pleased I will
> soon own #17 and I've been brooding tonight over Andi's pics and Ted
> Bunch's preliminary description of that one-of-a-kind iron, its carbon
> rosettes, its granular kamacite, its iron, nickel, cobalt,
> phosphorus and
> Si contents.
>
> I went through numerous Vagn Buchwald pages reading about and
> looking at
> several pics of IIF irons trying to figure out what this new iron
> might be.
> I re-read information about La Caille, but, ... nothing comes
> really close
> to what this weird iron looks like. Can hardly wait to look at it
> under my
> microscope and am eagerly waiting for final classification results
> from
> Ted Bunch and other labs!
>
> This iron is so weird that even Ted Bunch is not sure yet whether
> it should
> be classified as a IAB, a IIF or a IIICD iron!
>
> Best wishes,
>
> Bernd

I too bought one of Andi's slices. Slice #13.

I read Ted Bunch's preliminary analysis and it seemed like the Co
content was way too low to be a member of the IAB group. In fact in
seemed low period.
I wish I had Metbase handy so I could make more comparisons. Any
else have an opinion about the Co content?

Mike Fowler
Chicago

ebay starsandrocks

> Phase compositions via SEM EDS in weight percent:
>
> Fe Ni Co P Si
>
> Kamacite 91.4 7.4 0.45 0.4 0.32
>
> Taenite 67.4 30.6 0.13 0.13 0.22
>
> Bulk 85.5 14.2 0.21 0.35 0.27
Received on Tue 25 Sep 2007 12:29:38 PM PDT