[meteorite-list] Polymict EUC vs. HOW - NWA1109 question

[mark ford]

Harlan,

Polymict Eucrite's contain less than 10% diogenite clasts (this is man
made value to discriminate between Polymict Eucrites and Howardites) 

Howardites also show more of an even distribution of eucritic and
diogenitic inclusions. Polymict Eucrites often contain pyroxene zones
within the basaltic clasts whereas the pyroxenes in howardites are
mostly unzoned

So it has to do with diogenite content...

Mark Ford



-----Original Message-----
From: harlan trammell [mailto:skyrox at hotmail.com] 
Sent: 26 May 2004 14:53
To: Altmann at Meteorite-Martin.de; meteorite-list at meteoritecentral.com
Subject: RE: [meteorite-list] Polymict EUC vs. HOW - NWA1109 question


at what point does a polymict eucrite become a howardite? grain size?
melt?etc.??? will the REAL howardite please standup? what ARE the
definitive criteria of howardite?

always cc a back-up to: skyrox at crapmail.com as hotmail does not work
sometimes
>From: "Martin Altmann" <Altmann at Meteorite-Martin.de> >Reply-To: Martin
Altmann <Altmann at Meteorite-Martin.de> >To:
<meteorite-list at meteoritecentral.com> >Subject: [meteorite-list]
Polymict EUC vs. HOW - NWA1109 question >Date: Wed, 26 May 2004 15:36:27
+0200 > >Hello list, > >has anyone an idea, which of the finds paired
with NWA1109 are classified as howardites? >NWA1109 is listed in the
Bulletin as polymict eucrite. >Some sell it as howardite, some as
howardite or eucrite, some as eucrite. > >Thanks! >Martin
>______________________________________________ >Meteorite-list mailing
list >Meteorite-list at meteoritecentral.com
>http://six.pairlist.net/mailman/listinfo/meteorite-list 



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