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

From: mark ford <markf_at_meteoritecentral.com>
Date: Wed May 26 11:15:03 2004
Message-ID: <6CE3EEEFE92F4B4085B0E086B2941B310144E7_at_s-southern01.s-southern.com>

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@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
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Received on Wed 26 May 2004 11:08:32 AM PDT