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

[bernd.pauli at paulinet.de]

Mark wrote:

> It has been provisionally classified as a "IIICD (aka: IAB subclass LM)."
> ... I am not really an iron expert, but I guess that means fine octahedrite.

L  = low-Au (Au = gold)
M = medium-Ni subgroup

Thus the old group IIIC would now be called sLM. Please go to David Weir's
website for a comprehensive overview of these criteria (LM, LH, MG, etc.)

> The meteorite itself is somewhat confusing, as the nickel content
> doesn't seem to line up well with any of the IIICD's except the
> Ataxites

Carlton => 12.77-13.00 % Ni
Quarat al Hanish => 12.8 % Ni
Edmonton (Kentucky) => 12.57 %-12.7 % Ni

But these have higher gallium values, especially Edmonton and both Edmonton
and Quarat al Hanish have higher iridium values. Carlton comes closest to 2677
with regard to the Ni, Ga, and Ir values.


Best wishes,

Bernd