AW: [meteorite-list] Troilite in a pallasite? Why are the crystals so small?

From: Norbert Classen <trifid_at_meteoritecentral.com>
Date: Thu Apr 22 09:54:06 2004
Message-ID: <NCBBKMGDKLMGIBALJOFCEEOECIAA.trifid_at_timewarp.de>

Hello Graham,

I have no Brahin with such an inclusion, but let me say that
the boundary regions between metal and olivine in pallasites
often contain accessory minerals such as troilite, chromite,
and schreibersite. If you have a picture of the inclusion,
someone could surely tell you what it is, but I suspect that
it might be either troilite or schreibersite.

Best,
Norbert Classen

> -----Original Message-----
>
> I have a 27 gram Brahin pallasite (not etched) that has what
> looks like a troilite inclusion. The inclusion is sort of
> greyish-brown and darker than the surrounding metal and it
> appears to have a very fine grainy texture when observed at
> 10x magnification. Is this troilite (FeS)? It is very
> irregularly shaped compared to the round inlusions found in
> iron meteorites and it has many closely packed shards of
> olivine as opposed to the larger crystals outside of it. It
> measures approximately 15mm by 10mm.
>
> ************************************************************
> Graham Christensen
> majorvoltage_at_hotmail.com
> http://www.geocities.com/aerolitehunter
>
Received on Sun 17 Feb 2002 05:29:05 PM PST