AW: [meteorite-list] Seymchan question

[McomeMeteorite Meteorite]

thanks for all informations

Matteo


>From: Jörn Koblitz <koblitz at microfab.de>
>To: "McomeMeteorite Meteorite" 
><meteorites at hotmail.com>,<meteorite-list at meteoritecentral.com>
>Subject: AW: [meteorite-list] Seymchan question
>Date: Mon, 8 Nov 2004 12:30:09 +0100
>
>Matteo,
>
>Seymchan was first classified as IIE based on metal composition. This 
>classification was revised to "ungrouped" lateron after another analysis 
>was done (see: J.T.Wasson and J.Wang, GCA, 1986, 50, p.725). I assume, all 
>analyses were done of material derived from the 273 kg main mass in Moscow. 
>This piece obviously doesn't show any olivine (at least at the outer 
>visible part). Thus, a classification as a pallasite could not be made as 
>it requires the presence of olivine in shapes and sizes typical for 
>pallasites. If the material which is presently sold as Seymchan is indeed 
>paired with the main mass at Vernadsky Moscow (which is evident), then it 
>must be reclassified from "UNGROUPED IRON" to "pallasite". As it seems that 
>the metal is chemically anomalous with respect to typical main group 
>pallasites, which show composition similar to IIIAB group irons, Seymchan 
>must be regarded an ungrouped pallasite (like e.g. Glorieta Mountain). We 
>will have to wait for new analyses, especially of the silicates, to get a 
>clearer picture of its relationship to other known pallasites. The 
>distribution of olivine in Seymchan much resembles those we know from 
>Glorieta Mountain, another ungrouped pallasite. Some larger pieces of 
>Glorieta lacking any olivine.
>
>Best regards,
>Jörn Koblitz / MetBase
>
>
> > -----Ursprüngliche Nachricht-----
> > Von: McomeMeteorite Meteorite [mailto:meteorites at hotmail.com]
> > Gesendet: Montag, 8. November 2004 11:39
> > An: meteorite-list at meteoritecentral.com
> > Betreff: [meteorite-list] Seymchan question
> >
> >
> >
> > Hello
> >
> > One question on Seymchan, its confirm is a pallasite or is a
> > IIE Iron????
> > The 2 pieces I have its full of olivine - not to paired to
> > silicated - and
> > another piece I have in arrive its without olivine, only
> > iron. Now, its
> > similar to Brenham where the meteorite have and not have
> > olivine or is
> > another type of meteorite?
> >
> > Matteo
> >
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