[meteorite-list] troilite euhedral crystals

[Gary K. Foote]

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 écrit :
> >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
> Université 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