[meteorite-list] AD - A FEW DANDYS

From: David Weir <dgweir_at_meteoritecentral.com>
Date: Fri May 20 18:49:31 2005
Message-ID: <428E6954.8080502_at_earthlink.net>

Hi Rob,

After absorbing most of the classification information that Jeff
Grossman was so kind in providing to the list last Tuesday, I have found
some inconsistencies in the information that you quoted on your webpage
regarding NWA 2653. In the first case you quoted a source that grouped
3133/1839/2653 together as paired. However, in the MetBull #89 Preview,
NWA 1839 is officially classified as an L7, not an ungrouped PAC. Last
time I looked at the NAU website this meteorite was also listed as an L7
(it is curiously missing from their site today). Also, the implication
was made that the O-isotope plot was the reason for the primitive
achondrite designation rather than an L7 designation, but I don't think
the O-isotopes have anything to do with this decision. Finally, your
primitive achondrite NWA 2653 could not possibly be a CV7 as Jeff
succinctly explained to us, these terms are mutually exclusive -
primitive achondrites contain a melt component, at which point the Van
Schmus-Wood scheme is no longer valid.

David (still in a learning mode)
Received on Fri 20 May 2005 06:48:52 PM PDT