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:[EMAIL PROTECTED] Sent: 26 May 2004 14:53 To: [EMAIL PROTECTED]; [EMAIL PROTECTED] 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: [EMAIL PROTECTED] as hotmail does not work sometimes >From: "Martin Altmann" <[EMAIL PROTECTED]> >Reply-To: Martin Altmann <[EMAIL PROTECTED]> >To: <[EMAIL PROTECTED]> >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 >[EMAIL PROTECTED] >http://six.pairlist.net/mailman/listinfo/meteorite-list Watch LIVE baseball games on your computer with MLB.TV, included with MSN Premium! ______________________________________________ Meteorite-list mailing list [EMAIL PROTECTED] http://six.pairlist.net/mailman/listinfo/meteorite-list
