[meteorite-list] Ni-free

From: Adam Hupe <adamhupe_at_meteoritecentral.com>
Date: Thu Apr 22 10:08:29 2004
Message-ID: <001201c260fd$7aa63320$f60ee70c_at_attbi.com>

Hello everybody,

In this case Ni-Free metal means 6/100th of one percent or .06%. In other
words trace amounts. This was such an odd result that we measured it
several times and confirmed it. We also confirmed that we were analyzing the
actual metal and not some other mineral. The nickel in the metal of NWA 1109
just makes a small peak (about 3.2%) on the spectrograph and would be
considered kamacite.

I hope this helps,

Adam


----- Original Message -----
From: "Bernd Pauli HD" <bernd.pauli_at_lehrer.uni-karlsruhe.de>
To: "fcressy" <fcressy_at_prodigy.net>
Cc: "Adam Hupe" <adamhupe_at_attbi.com>; <meteorite-list@meteoritecentral.com>
Sent: Friday, September 20, 2002 3:46 PM
Subject: [meteorite-list] Ni-free


> Adam wrote:
>
> > This stone consists of subequal amounts of orthopyroxene
> > (Fs28Wo4.7 to Fs30Wo6.5, FeO/MnO = 28-32) and olivine
> > (Fa36; FeO/MnO = 46.5), large chromite grains, minor
> > anorthite, clinopyroxene, troilite, and Fe-metal (Ni-free).
>
> Lucky Frank wrote:
>
> > The part that caught my eye in the above description was that
> > the metal was Ni-free. I am not familiar with any meteorite
> > where the iron portion isn't associated with nickel. Are
> > there any others?
>
>
> Hello All,
>
> All I can come up with at the moment is another NWA entry: NWA 1109.
> It was described as "Accessory minerals in clasts and matrix include
> ilmenite, Ni-free Fe metal, chromite, baddeleyite and apatite."
>
> I don't know if this is an official and final description of this
> eucrite. Maybe Ni-free is something like low-Ni metal (kamacite),
> which does in no way make this olivine diogenite less enigmatic !!!
>
> Cheers,
>
> Equally Lucky
> And Happy,
> Bernd
>
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Received on Fri 20 Sep 2002 07:28:51 PM PDT