[meteorite-list] PAC vs Type-7 vs IMB? (Was: Portales Valley Classification Info)

[Martin Altmann]

Hi Mr.Woolard, list

Thanks for the oportunity, because I have a question:
What are the hard criteria for to distinghuish from ot foe classifying a
stone as

Impact Melt Breccia
versus
pertological Type 7
versus
Primitive Achondrite

Until now I couldn't find nor anybody could give me an exact answer,
so that I almost was tempted to call the recent occurence of several L7s and
H7s as a fad.

May someone enlighten us?
Curiously Bucklebooing
Martin



----- Original Message ----- 
From: "Robert Woolard" <meteoritefinder at yahoo.com>
To: <meteorite-list at meteoritecentral.com>
Sent: Tuesday, May 17, 2005 4:21 AM
Subject: [meteorite-list] Portales Valley Classification Info


> Hello List,
>
>   Well for years now, I know a lot of us were puzzled
> by the classification of Portales Valley as an " H6
> ordinary chondrite". (See my article in the May 2001
> issue of Meteorite, titled " Portales Valley - A Not
> So Ordinary (Ordinary Chondrite??)! "  In the recent
> past, the classification was modified a bit, being
> changed to read as an " H6 Impact Melt Breccia ".
>
>   I am excited to be able to say that there is a
> distinct chance the true uniqueness of PV may soon be
> reflected in a possible new moniker for this
> intriguing meteorite. David Weir was kind enough to
> make me aware of a new and comprehensive paper by Alex
> Ruzicka, Marvin Killgore, David Mittlefehldt, and Marc
> Fries in the current MAPS. In this detailed work, we
> now have the proposed reclassification of PV as an "
> H7, metallic-melt breccia (primitive achondrite)",
> with the case made for a new meteorite type
> designation of "Portalesite" due to this metallic-melt
> breccia characteristic.
>
>   You can read David's updated description of PV on
> his excellent website here:
>
>     http://www.meteoritestudies.com
>
>   Many thanks to David for news of this exciting
> paper, and to the authors of the paper as well.
>
>   Sincerely,
>   Robert Woolard
>
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