[meteorite-list] Andi's Recrystallized NWA iron

[Mike Fowler]

> 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