[meteorite-list] troilite euhedral crystals

From: Gary K. Foote <gary_at_meteoritecentral.com>
Date: Sat, 13 Jan 2007 13:22:05 -0500
Message-ID: <45A8DCFD.24574.17B6B6C_at_localhost>

Superb photos. There is now a page at;

http://www.meteorite-dealers.com/sierracolorada-zelmir.html

Check this out everyone!

Gary

On 13 Jan 2007 at 17:37, Zelimir Gabelica wrote:

> Hello Dave, Gary, Bernd, Roger, list
>
> Dave, I am glad youthese mentioned euhedral (pyritohedral) troilite crystals.
>
> Well, I formely cut a Sierra Colorada (Argentina, L5) and two of the slices
> obtained contained large (almost centimetric) vugs, some making the 3 mm
> thick slice hollow!
> Looking inside is again really breathtaking.
> Several 5 to almost 10 mm (!) euhedral metallic crystals (also pyritohedral
> in shape) can be seen, aligned or dispersed, some as quasi isolated single
> crystals, onto the vug walls.
> One of them is sectioned through cutting and that small cut face (clearly
> seen on 2 pictures) indiceted to me, from the typical luster of the cut
> section, that these could be schreibersite (also possible, though perhaps
> less likely than troilite). See pictures 4741 and 4744.
>
> This is as spectacular as looking into a geode of a terrestrial mineral
> (although I have never seen terrestrial schreibersite, if ever it exists,
> because phosphides should readily yield phosphates in contact with air).
>
> My friend Roger Warin, not only expert in taking spectacular pictures of
> thin sections (see some preceding posts), was also able to realize superb
> close-ups of these geodes and "schreibersite" crystals.
> I have no web site to store these peictures for the list but I am enclosing
> 5 of them as attachments for Bernd, Dave, Roger and Gary .
>
> Should perhaps Gary find a way to put them on his URL and send the link to
> the list, this wouild be just great!
> Thanks!
>
> Pleased to read your comments.
>
> Take care,
>
> Zelimir
>
>
> A 16:13 13/01/2007 +0000, Dave Harris a ?crit :
> >Hi,
> >My Mt. Taz definitely has euhedral crystals in the vesicles - unfortunately,
> >my binocular microscope only magnifies to about x35 or so and they are very
> >small (very sub-mm ) but become apparent when the specimen is tilted and the
> >light glints off the faces.
> >
> >The structure is typically pyritohedral in shape - I am assuming (a
> >dangerous thing to do) that these are Troilite xls.
> >
> >..and I never got a response as to what gases made the vesicular structure!
> >
> >
> >Best
> >
> >
> >
> >Dave
> >IMCA #0092
> >Sec.BIMS
> >www.bimsociety.org
> >______________________________________________
> >Meteorite-list mailing list
> >Meteorite-list at meteoritecentral.com
> >http://six.pairlist.net/mailman/listinfo/meteorite-list
>
> Prof. Zelimir Gabelica
> Universit? de Haute Alsace
> ENSCMu, Lab. GSEC,
> 3, Rue A. Werner,
> F-68093 Mulhouse Cedex, France
> Tel: +33 (0)3 89 33 68 94
> Fax: +33 (0)3 89 33 68 15
Received on Sat 13 Jan 2007 01:22:05 PM PST