[meteorite-list] NWA 2918 CO3.0 reclassification ANDMostCurrent/Accurate Meteorite Classification

From: Adam Hupe <raremeteorites_at_meteoritecentral.com>
Date: Sat Jul 22 20:49:21 2006
Message-ID: <004501c6adf2$075a7f20$6401a8c0_at_c1720188a>

Another note, several laboratories are currently studying NWA 2918 including
UCLA. It will be interesting to hear what they have to say. In the interest
of keeping up to date, I will contact Dr. Bunch and see if he agrees that
this may possibly be a 3.1 instead of a 3.0 without insulting his decades of
experience.

Until then,

Regards,

Adam

----- Original Message -----
From: "Adam Hupe" <raremeteorites_at_comcast.net>
To: <meteorite-list_at_meteoritecentral.com>
Sent: Saturday, July 22, 2006 5:33 PM
Subject: Re: [meteorite-list] NWA 2918 CO3.0 reclassification
ANDMostCurrent/Accurate Meteorite Classification


> I was told that the new method which Dr. Grossman proposed was used in
> determining a perfect 3.0 by the scientists involved with the study so I
> guess this leaves some confusion. The Cr2O3 measurements in olivine was
> reported so I will have to go with NAU's results for now. By the way,
> David, why are you so jealous that you need to look for fault where none
> exists? We have hundreds of classifications under our belt and so do other
> dealers. Why is that you only mention pieces we are involved with? We do
> not make this stuff up, it is reported in the bulletin. You have been
wrong
> so many times and not once have you apologized. Instead you persist in
> trying to start arguments.
>
> I have lost all respect for you,
>
> Adam
>
>
>
>
>
> ----- Original Message -----
> From: "Jeff Grossman" <jgrossman_at_usgs.gov>
> To: "Meteorite List" <meteorite-list_at_meteoritecentral.com>
> Sent: Saturday, July 22, 2006 5:11 PM
> Subject: Re: [meteorite-list] NWA 2918 CO3.0 reclassification AND
> MostCurrent/Accurate Meteorite Classification
>
>
> > Two replies for the price of one:
> >
> > 1) NWA 2918. An abstract is not peer reviewed, however I'll stand by
> > my classification of NWA 2918. It's a very nice meteorite, but more
> > metamorphosed than 3.0. There are actually three CO3.0
> > chondrites. In addition to ALHA77307, Y-81020 and Colony are both
> > 3.0, but Colony is so horribly weathered that it is scarcely worth
> mentioning.
> >
> > 2) What is the most current and accurate classification? Let me
> editorialize.
> >
> > * The Catalogue of Meteorites online database used to be the best,
> > but it has simply not been updated frequently enough to keep up with
> > current science or new
> > meteorites. http://www.nhm.ac.uk/research-curation/projects/metcat/
> >
> > * MetBase, which is not an online resource, is very current (usually
> > within 6 months), but in a few cases the classifications have been
> > updated in a less conservative way than I would
> > do. http://www.metbase.de/. It is an excellent resource.
> >
> > * The original Meteoritical Bulletin classifications were simply
> > initial evaluations, so they are not to be trusted down the road.
> >
> > * In the MetBull database, you will find a "recommended"
> > classification. These are largely taken from MetBase plus NomCom,
> > ANSMET, and NIPR data releases that postdate the latest edition of
> > MetBase. However, they are tempered by me. For example, if you look
> > up Tagish Lake, MetBase will tell you it's CI2, which was a
> > speculative statement in the initial description and a few
> > abstracts. The NHM Catalogue database just says C2, which is not
> > very helpful. If you read the literature, especially Zolensky's big
> > 2002 paper in MAPS, it's pretty clear that a conservative conclusion
> > would be C2 ungrouped. So when I think MetBase went too far, as in
> > this case, I back it off a bit in the recommendation. In other
> > words, I am the editor of this database. You can always see the
> > original MetBull, the NHM, and the MetBase classification as well.
> > http://tin.er.usgs.gov/meteor/
> >
> > * The new Encyclopedia of Meteorites is a work in progress. It gets
> > a lot of information directly from the MetBull database (in real time
> > now!), but it also lists a number of meteorites that are not formally
> > named or classified. You take your chances with these, as far as I'm
> > concerned. http://www.encyclopedia-of-meteorites.com/login.asp
> >
> > If there's anything else out there online, I don't know much about
> > it. So there you have it.
> >
> > Jeff
> >
> > At 07:25 PM 7/22/2006, David Weir wrote:
> > >Hello Adam,
> > >
> > >I just wanted to bring to your attention the new MetSoc abstract
> > >written by Jeff Grossman et al. which disputes the initial
> > >classification of your CO3.0 NWA 2918, and argues that it's actually
> > >a CO3.1. I see that you still have this meteorite for sale on ebay
> > >as a CO3.0 and I'm sure you'll want to include this correction in
> > >your accompanying description (see below) for the benefit of the
> > >potential buyer. Obviously the new stricter standards to which you
> > >refer are not the strictest in use. When I bought my two small
> > >pieces of this one from you I admit I was speculating that it would
> > >hold up as a rare CO3.0 comparable to the only known CO3.0,
> > >ALHA77307, especially based on your description, but a CO3.1 is not
> > >bad either. The abstract can be viewed here:
> > >
> > >http://www.lpi.usra.edu/meetings/metsoc2006/pdf/5283.pdf
> > >
> > >Since this was not published in a peer-reviewed journal perhaps Jeff
> > >Grossman is wrong, time will tell. Keep up the great work in finding
> > >us new rare material Adam.
> > >
> > >Regards,
> > >
> > >David
> > >meteoritestudies.com
> > >--------------------------------------------
> > >BRAND NEW-NWA 2918 Intensely Rare CO3.0 Meteorite .752g
> > >
> > >.752 gram end cut of Northwest Africa 2918, a CO3.0, S1, W2 Ornans
> > >type carbonaceous chondrite found 2005 in the Sahara desert. The
> > >perfect 3.0 subtype is exceeding rare among all types of chondrites
> > >but is the ultimate rarity among CO type chondrites with only one
> > >other non-Antarctic meteorite listed in the Catalog of Meteorites
> > >which is named Colony. NWA 2918 was graded using the new stricter
> > >standards so it is now the only perfect 3.0 in private hands that I
> > >am aware of since Colony was slightly downgraded to a 3.0-3.1 using
> > >the same new standards. The only other perfect 3.0 is an Antarctic
> > >piece named ALH 77307, which is not available to the public. Only
> > >one stone was found and it weighed only 237 grams making it an
> > >intensely rare specimen.
> > >
> > >______________________________________________
> > >Meteorite-list mailing list
> > >Meteorite-list_at_meteoritecentral.com
> > >http://six.pairlist.net/mailman/listinfo/meteorite-list
> >
> > Dr. Jeffrey N. Grossman phone: (703) 648-6184
> > US Geological Survey fax: (703) 648-6383
> > 954 National Center
> > Reston, VA 20192, USA
> >
> >
> > ______________________________________________
> > Meteorite-list mailing list
> > Meteorite-list_at_meteoritecentral.com
> > http://six.pairlist.net/mailman/listinfo/meteorite-list
>
>
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Received on Sat 22 Jul 2006 08:45:44 PM PDT