[meteorite-list] Stones with High Troilite, Low Metal

From: Pete Pete <rsvp321_at_meteoritecentral.com>
Date: Mon, 27 Jun 2011 00:31:45 -0400
Message-ID: <bay153-w42304EFE707206467A6876F8570_at_phx.gbl>

Thank you all for your responses.

 

You're right, Doug, too ambiguous a question.

 

I have an unclassified NWA, which I've sliced and polished. There are so many interesting features that it is the type that you never get tired of looking at under the microscope.

It has what appears to be the remains of transformed chondrules; four total in about 2cm^2 surface.

Three look like bit-remains of brecciated chondrules, grey and white. The other looks like a typical barred chondrule that has become completely crystallised, and has the schiller effect.

 

A very fine grained matrix, no observable free metal as in nickel/iron, and what *appears* to be typical troilite scattered throughout.

 

Low attraction to a neodymium magnet.

 

The fusion crust is relatively fresh, with no chert.

 

Quite different from the others I've got, so I was hoping to read and possibly view images of similar.

 

As I said, there are no silver metal flecks, only the dull yellow troilite-looking areas.

Is it possible for nickel/iron to have this appearance, too? I had mentally eliminated that due to the low magnet attraction, but I've got lots to learn.

 

Cheers,

Pete

 








----------------------------------------
> To: meteoritemike at gmail.com; meteorite-list at meteoritecentral.com
> Date: Sun, 26 Jun 2011 16:13:26 -0400
> From: mexicodoug at aim.com
> Subject: Re: [meteorite-list] Stones with High Troilite, Low Metal
>
>
>
> Mike G wrote
> "As far as which mets have an abundance of troilite but little free
> metal, I cannot think of any right off-hand."
>
> Why not Albareto, which is rather low metal 'transitional'. And of
> course the type specimen for troilite.
>
> That would satisfy a specific rock that may or may not randomly have
> gotten more or less than its allotment of troilite & without a handy
> database to sort. Pete - it would be satisfactory for many readers (or
> maybe just me, I guess I can't speak for the main mass) that you
> mention a little more about what you are after, than a generic question
> that is so wide open to interpretation. Might actually stimulate more
> discussion and be educational. For example do you mean to exclude
> pentlandite, and why; what's up with the question? Do you just want a
> meteorites oxidized in excess sulfur and/or low oxygen ... bla bla bla
>
> Kindest regards
> Doug
>
>
>
> -----Original Message-----
> From: Michael Gilmer <meteoritemike at gmail.com>
> To: MexicoDoug <mexicodoug at aim.com>
> Cc: Meteorite-list at meteoritecentral.com
> Sent: Sun, Jun 26, 2011 3:50 pm
> Subject: Re: [meteorite-list] Stones with High Troilite, Low Metal
>
>
> Hi List,
>
> On rare occasion I have seen troilite nodules for sale, but not as
> often as graphite nodules.
>
> Recently, Ruben Garcia offered up a spectacular-looking graphite nodule.
>
> As far as which mets have an abundance of troilite but little free
> metal, I cannot think of any right off-hand.
>
> If it's relatively-pure troilite you are after, you might check with
> one of the big sellers of Campo (like Bob C.). I'm sure anyone who
> has tons of Campo laying around might have a troilite nodule or two.
>
> Best regards,
>
> MikeG
>
> --
> -------------------------------------------------------------------------
> --------
> Galactic Stone & Ironworks - Meteorites & Amber (Michael Gilmer)
>
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> -------------------------------------------------------------------------
> --------
>
> On 6/26/11, MexicoDoug <mexicodoug at aim.com> wrote:
> > Lunar and Martian basalts are about 1% troilite and not very magnetic
> > if you would like that to be a free metal consideration/measure. If
> > not, you could always scrape off some meteoritic shale or go for
> highly
> > oxidized high troilite containing iron meteorites ... like Campo or
> > Canyon etc.
> >
> >
> > -----Original Message-----
> > From: Pete Pete <rsvp321 at hotmail.com>
> > To: meteoritelist meteoritelist <meteorite-list at meteoritecentral.com>
> > Sent: Sun, Jun 26, 2011 2:55 pm
> > Subject: [meteorite-list] Stones with High Troilite, Low Metal
> >
> >
> >
> >
> > Sorry about that - once more with a subject:
> >
> >
> >
> > Hi, All,
> >
> > Is there any particular stone meteorite that has a high content of
> > troilite and
> > a low content of free metal?
> >
> >
> >
> > Cheers,
> >
> > Pete
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Received on Mon 27 Jun 2011 12:31:45 AM PDT