[meteorite-list] AD - Do you want a rareandimportantMetachondrite?

[M come Meteorite Meteorites]

Ok, but now I ask a clear definition..NWA 1058 its a
acapulcoite? a winonaite? a like winonaite? Its a
chaos...a study say its a acapucloite, another say its
a winonaite, the first analysis say its a acapucloite
like winonaite....

Matteo

--- David Weir <dgweir at earthlink.net> ha scritto: 

> Hello Satn, whoops make that Stan,
> 
> I'd like to refer you to the original abstract in
> which the term 
> metachondrite was proposed.
> 
>
<http://www.lpi.usra.edu/meetings/metsoc2005/pdf/5218.pdf>
> 
> I have also understood the deficiency in the use of
> the term "primitive 
> achondrite", so I have gladly adopted the new term
> "metachondrite" on my 
> website. It is a meaningful substitute I think, and
> resolves ambiguities 
> in the previous terminology.
> 
> On the other note which you are discussing, that of
> NWA 1058, I believe 
> the evidence is now leaning greatly in favor of this
> being a member of 
> the winonaites, so its sale as an acapulcoite
> doesn't seem responsible 
> to me anyway. See this abstract to view the new
> diagram comparing 17O to 
> olivine Fa content, which has been found to resolve
> these two groups 
> when mineralogical data couldn't. NWA 1058 plots
> clearly within the WIN 
> field and not the ACA/LOD field:
> 
>
<http://www.lpi.usra.edu/meetings/metsoc2005/pdf/5138.pdf
> 
> David
> 
> 
> 
> stan . wrote:
> > it's not written in the work of the met soc
> because the term 
> > metachonderite DIDNT EXIST when nwa 725 was
> classified... you previously 
> > reffered me to David Weir's web site - take a look
> - ALL of the sub 
> > types of acapulcoites and winonaites fall under
> the heading of 
> > metachonderites - it's a broad term that applies
> to each and every 
> > meteorite of that classification - not only
> specific ones.
> 
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M come Meteorite - Matteo Chinellato
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