[meteorite-list] Iron meteorite inclusion question

From: Steve Witt <stelor96_at_meteoritecentral.com>
Date: Thu, 19 Aug 2010 20:07:54 -0700 (PDT)
Message-ID: <857977.4275.qm_at_web56401.mail.re3.yahoo.com>

Yinan, Mike,

I had a slice of Odessa years back that I had etched with Ferric Chloride and the process turned to otherwise "brassy" looking Troilite nodules a dark gray to almost black color. The Schreibersite remained nice and sparkly. I had the specimen re-etched with nitric and got my nice brassy look back again.

From what I understand you can get around this by "painting" the troilite inclusions with a clear lacquer before etching with ferric and then remove the lacquer with acetone or some such solvent afterwards.

Best,
Steve
Steve Witt
IMCA #9020
http://imca.cc/


--- On Thu, 8/19/10, Galactic Stone & Ironworks <meteoritemike at gmail.com> wrote:

> From: Galactic Stone & Ironworks <meteoritemike at gmail.com>
> Subject: Re: [meteorite-list] Iron meteorite inclusion question
> To: "Yinan Wang" <veomega at gmail.com>
> Cc: "METEORITE LIST" <meteorite-list at meteoritecentral.com>
> Date: Thursday, August 19, 2010, 7:43 PM
> Hi Yinan,
>
> The dark inclusions could be graphite.? Troilite often
> has a "brassy"
> coloration to it.
>
> Do you have a photo of the slice?
>
> Best regards,
>
> MikeG
>
>
> On 8/19/10, Yinan Wang <veomega at gmail.com>
> wrote:
> > Hi everyone, simple question:
> >
> > In an iron meteorite, when etched, what do the
> troilite and
> > schreibersite inclusions look like?
> >
> > I have a slice of canyon diablo and I'm seeing dark
> round nodules (the
> > troilite) and silvery dendritic material
> (schreibersite?). Which is
> > which?
> >
> > Thanks,
> > Yinan
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>
> --
> ------------------------------------------------------------
> Mike Gilmer - Galactic Stone & Ironworks Meteorites
> http://www.galactic-stone.com
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Received on Thu 19 Aug 2010 11:07:54 PM PDT