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

[David Weir]

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.