[meteorite-list] John's Interesting Iron Meteorite, NWA 2677

From: John Birdsell <birdsell_at_meteoritecentral.com>
Date: Sun Dec 12 12:31:21 2004
Message-ID: <41BC8085.5090608_at_email.arizona.edu>

Hi Mark and List. Thanks for posting your photo of our new IIICD (IAB
sLM). Actually, I think that it would plot within the old IIIC grouping
which Wasson & Kallemyne (2000) have now placed in the IAB iron complex,
subgroup LM. The 'L' stands for Low Au content and the 'M' stands for
'medium' nickel content. In this meteorite, the nickel content is 12.8%.
If anyone would like to read about the new IAB groupings, the reference is:

Wasson, J.T. and Lakkemeyn, G. W.
"IAB iron-meteorite complex: A group, five subgroups, numerous
grouplets, closely related, mainly formed by crrystal segregation in
rapidly cooling melts."
Geochimica et Cosmochimica Acta, Vol. 66, No. 13, pp. 2445-2473, 2002

If you can not find this reference anywhere, just email us and we'll
send you a pdf.

We will put up our last few slices of this lovely new IIICD this afternoon.


Cheers

-John & Dawn
Arizona Skies Meteorites



MARK BOSTICK wrote:

> Hello John and list,
>
> I recently picked up a small piece of NWA 2677 from John Birdsell. An
> interesting iron meteorite of 100g. It has been provisionally
> classified as a ?IICD (aka: IAB subclass LM).? noted from John?
> website. I am not really an iron expert, but I guess that means fine
> octahedrite. The meteorite itself is somewhat confusing, as the nickel
> content doesn? seen to line up well with any of the IIICD? except the
> Ataxites I suppose, but this has a obvious bold octahedrite pattern.
>
> I managed a pretty good photo of my slice on my collection page. (I
> now have studio lights and equipment...which also of course means, my
> camera is giving me problems now...:-(
>
> http://www.meteoritearticles.com/colnwa2677.html
>
> Also, John asked about possible pairs. Doing a little research on the
> iron I have found the following meteorite classified somewhat close
> and location of find possibly close. Could this be a possible pair?
>
> Hassi-Jekna, IIICD, found El Golea, Algeria in 1890, TKW 1890,
> Bandwidth .47mm.
>
> Clear Skies,
> Mark Bostick
> www.meteoritearticles.com
> www.kansasmeteoritesociety.com
> www.imca.cc
>
>
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Received on Sun 12 Dec 2004 12:31:49 PM PST