Hello Peter, GregC and Tom,
Peter has it right, each and EVERY suspect 'pairing' to NWA 5400 absolutely
has to have oxygen isotope analysis performed, on every stone. Most people
do not know about the additional stones that 'looked' like NWA 5400, but
oxygen work proved they were not paired. I even submitted samples from
additional stones I sampled while in Morocco two years ago that 'looked'
similar to NWA 5400, but oxygen analysis later proved them to be 'just'
brachinites. NWA 5400 is one meteorite that requires these advanced
analysis, no shortcuts or visual 'pairing' will cut it. As Peter pointed
out, "...further studies are currently [being] made concerning NWA 5363." In
other words, oxygen isotope analysis has not been completed so "NWA 5363"
has not been confirmed as a pairing [to NWA 5400]. The last discussion on
this List during the summer months stated that. Dr. Irving had not yet
received a sample of "NWA 5363". But then again, which of the 30 stones, if
any, were sampled and sent to him?
Since we know that NWA 5363 consists of 30 (thirty) different stones
totaling ~2kg, I and Dr. Irving, among others, believe that each and every
stone that is considered as "NWA 5363" need to be individually studied and
have oxygen analysis performed, unless all 30 pieces fit neatly together as
a puzzle, which they do not. As we know, visual comparisons do not make for
a pairing even upon the 30 pieces where only one stone was sampled. As Dr.
Irving stated, "NWA 5363" will always be a suspect meteorite because of the
unfinished work (no oxygen performed) and the fact that there are 30
different stones that were visually paired, tossed in a box, and then sold
around the world as being paired to the one sampled "NWA 5363" stone.
I am not trying to further any negative discussions here, these are just the
facts. If I had a stone from "NWA 5363", you bet I would send a piece of
that particular rock and have oxygen analysis performed, preferably by the
same lab where NWA 5400 was studied. Short of that, you have, or are
offering, unconfirmed stones which may or may not be paired to the "NWA
5363" stone, much less NWA 5400.
I will not engage into any further discussions here regarding this topic. If
you have concerns about your "NWA 5363" stone, contact a scientist who is
willing to study your rock.
Best regards,
Greg
====================
Greg Hupe
The Hupe Collection
NaturesVault (eBay)
[email protected]
www.LunarRock.com
IMCA 3163
====================
Click here for my current eBay auctions:
http://search.ebay.com/_W0QQsassZnaturesvault
----- Original Message -----
From: "Peter Marmet" <[email protected]>
To: "Greg Catterton" <[email protected]>
Cc: <[email protected]>
Sent: Saturday, September 25, 2010 12:13 PM
Subject: Re: [meteorite-list] NWA 6292 (BRA) IS paired to NWA 5400 !
Hello Tom, Greg and list,
I know that further studies are currently made concerning NWA 5363. I
also know that several recent finds are - strangely - NOT paired to
NWA 5400, despite
the fact that they look very similar.
Here you can see picts of NWA 5363 (please scroll down) and NWA 6292
(paired to NWA 5400!)
http://www.marmet-meteorites.com/id41.html
...and here are two picts of a thin section of NWA 5363:
http://www.thinsections.ch/ts/LOD_-_ACAP_-_BRA.html (please scroll down)
Best,
Peter
2010/9/25 Greg Catterton <[email protected]>:
I have not seen anything recent, but last I read on here it had been
confirmed already to be paired (5363)
I have a couple nice slices of 5400 and I have to say that its awesome,
and I will be sharing thin section images of it soon.
Looking forward to seeing the 5363 images also!
Hope everyone is doing good today.
Greg Catterton
www.wanderingstarmeteorites.com
IMCA member 4682
On Ebay: http://stores.shop.ebay.com/wanderingstarmeteorites
On Facebook: http://www.facebook.com/WanderingStarMeteorites
--- On Fri, 9/24/10, [email protected] <[email protected]>
wrote:
From: [email protected] <[email protected]>
Subject: Re: [meteorite-list] NWA 6292 (BRA) IS paired to NWA 5400 !
To: [email protected]
Date: Friday, September 24, 2010, 8:12 PM
Hi list, I am working on a
batch of NWA 5363 (provisional) transmitted
light Xpol images and the results are turning out
very good.
I was wondering what the current scoop on 5363 is.
Any news of any other
pairings than 6292?
Does some one have the whole story on this?
Thanks, Tom
In a message dated 9/17/2010 11:31:09 A.M. Mountain
Daylight Time,
[email protected]
writes:
Dear buyers of NWA 6292, dear list members,
NWA 6292 IS paired to NWA 5400 !
Just got this info from Dr. A.J. Irving:
Quote:
"I received an analysis of the oxygen isotope
composition of NWA 6292,
which plots on the terrestrial
fractionation line, thus confirming that this specimen is
paired with NWA
5400."
I just updated my "Achondrites fro sale" page, incl.
NWA 6292 (BRA):
http://www.marmet-meteorites.com/id41.html
Please note: Status of NWA 6292 is still
provisional.
Thank you,
Peter
Peter Marmet - IMCA #2747
Bern, Switzerland
http://www.marmet-meteorites.com/
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