[meteorite-list] Term Main Mass

[M come Meteorite Meteorites]

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
> 
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>
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> 


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
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