[meteorite-list] Term Main Mass

From: M come Meteorite Meteorites <mcomemeteorite2004_at_meteoritecentral.com>
Date: Fri Jan 20 01:22:50 2006
Message-ID: <20060120062247.88699.qmail_at_web26208.mail.ukl.yahoo.com>

For me the main mass its the biggest piece survive
after cutting etc...

Matteo

--- Arizona Skies Meteorites <johnbirdsell_at_yahoo.com>
ha scritto:

> Adam this has got to be one of the stupidest things
> you've posted to this list. The NWA numbering system
> really isn't all that complicated. Just to help you
> out Adam, each and every NWA numbered meteorite has
> a
> MAIN MASS. For you, Adam that would mean the
> B-i-g-g-e-s-t piece. Maybe you have heard of a
> publication called the 'Meteoritical Bulletin'?
>
> Here's an excerpt from MB89 to help clarify things
> for
> you. Pay particular attention to the last three
> words.
>
>
> "Northwest Africa 2373 Northwest Africa Purchased
> 2004 August Martian (olivine-phyric shergottite)
> Several small stones that weigh 18.1 g were
> purchased
> in Erfoud Morocco. They are yellow brown with
> desert
> ablation/varnish surface only, no fusion crust.
> Description and classification (T. Bunch and J.
> Wittke, NAU): olivine phenocrysts (<1.25 mm in
> longest dimension) set in a fine-grained groundmass
> (<0.1 mm) of pigeonite, maskelynite, chromite,
> Ti-magnetite, augite, chlorapatite and sulphide.
> Olivine has cores of Fa30.7 (FeO/MnO = 51.9), rims
> of
> Fa50.3 (FeO/MnO = 53.3) and contain micron to
> submicron inclusions of chromite, glass, and barite.
> One large olivine grain, which may be a xenocryst,
> is
> different from the rest with a core of Fa29.1
> (FeO/MnO = 43) and more abundant tiny inclusions.
> The
> wide (0.2 to 0.4 mm), inclusion-free mantle on this
> grain is Fa32.3 (FeO/MnO = 39.2). Pigeonite is zoned
> from Fs29.4Wo8.4 to Fs36.4Wo14.1 (FeO/MnO = 28);
> augite is Fs21.8Wo29.1. Maskelynite is slightly
> zoned
> with a compositional average of An52.1Or2.1.
> Chromite, cr# = 87, fe# = 90.4. Overall texture,
> mineral content and mineral compositions strongly
> suggest that this stone is paired with NWA 1068. The
> specimen is lightly weathered and moderately
> shocked.
> Specimens: type specimen, 3.7 g and one thin
> section,
> NAU; main mass, Birdsell."
>
> Now Adam are you suggesting that the Scientists that
> write these classifications, the Nom Com and the
> editors of the Meteoritical Bulletin are somehow
> "misleading" and "dishonest"?
>
>
>
> Kind regards
>
>
>
> -John
>
>
>
>
> --- Adam Hupe <raremeteorites_at_comcast.net> wrote:
>
> > Dear List,
> >
> > I noticed some dealers and collectors are calling
> > pairings that are smaller
> > than the largest piece of a pairing series the
> "Main
> > Mass". An example
> > would be if an 8 kilogram Martian meteorite was
> > called DAG 476. Then
> > somebody comes up with a smaller 1 kilogram
> > meteorite named DAG XXX which
> > was found to paired to DAG 476. Then the dealer
> > sells the 1 Kilogram DAG
> > XXX as a "Main Mass." I think this practice is
> > misleading and dishonest. I
> > think the term "Secondary Largest Mass" may be
> more
> > appropriate.
> >
> > What do you think?
> >
> > Adam
> >
> >
> >
> > ______________________________________________
> > Meteorite-list mailing list
> > Meteorite-list_at_meteoritecentral.com
> >
>
http://six.pairlist.net/mailman/listinfo/meteorite-list
> >
>
>
> Arizona Skies Meteorites
>
> ______________________________________________
> Meteorite-list mailing list
> Meteorite-list_at_meteoritecentral.com
>
http://six.pairlist.net/mailman/listinfo/meteorite-list
>


M come Meteorite - Matteo Chinellato
Via Triestina 126/A - 30030 - TESSERA, VENEZIA, ITALY
Email: mcomemeteorite2004_at_yahoo.it
Sale Site: http://www.mcomemeteorite.it
Collection Site: http://www.mcomemeteorite.info
MSN Messanger: spacerocks at hotmail.com
EBAY.COM:http://members.ebay.com/aboutme/mcomemeteorite/


        

        
                
___________________________________
Yahoo! Mail: gratis 1GB per i messaggi e allegati da 10MB
http://mail.yahoo.it
Received on Fri 20 Jan 2006 01:22:47 AM PST