Hi Martin, Rob and everyone! Yes, it could be a crucible shaped CAI with
chondritic material within the bowl shaped depression. The American
Museum of Natural History is studying this specimen and they think it
may be a radically deformed crucible shaped CAI. I will try to post a
copy of the abstract on the website as soon as possible. They have not
yet performed X-ray tomography, but I am told that this will be one of
the analyses performed, and this could reveal whether it is crucible
shaped or spherical. Having cut the series of slices accross this CAI I
believe that it could definitely be spherical. I think that this may be
a more likely scenerio than a fluke dissection for another reason-there
are more than one donut shaped CAIs having chondritic material within it
in this same stone. It would be very unlikely for me to have
accidentally cut two different CAIs to produce this same very unusual
effect.
Cheers
-John
Martinh wrote:
Hi all CAI lovers,
Looking at the jelly doughnut (chondrule-filled CAI), I wondered if
the appearance could be misleading. I have seen some CAIs that are
rather convoluted meaning in a 3-D view, they might form a cone or
other shape where if cut along the right plane, it would appear as if
the CAI was completely surrounding the chondrules, but in reality,
the chondrule material is actually inside more of a CAI pipe or ice
cream cone. Therefore in a cross-section, say through the top of an
ice cream cone, it would appear that the cone material was completely
encasing the ice cream, but in reality, it is not.
Just some thoughts when looking at a wonderful collection of CAIs
from around the world. This is what makes this list fun!
Cheers,
Martin H
On Feb 8, 2005, at 8:25 PM, Rob Wesel wrote:
I have enjoyed every one of these as NWA 3118 is a favorite of mine
but John's in particular begs the question:
If CAI's are the oldest things out there then how does chondritic
material get completely encapsulated inside of one?
We have a lot to learn from this meteorite.
Rob Wesel
http://www.nakhladogmeteorites.com
------------------
We are the music makers...
and we are the dreamers of the dreams.
Willy Wonka, 1971
----- Original Message ----- From: "John Birdsell"
<[EMAIL PROTECTED]>
To: <meteorite-list@meteoritecentral.com>
Sent: Tuesday, February 08, 2005 12:34 PM
Subject: Re: [meteorite-list] Nice CAI in a CV3
Hello Martin and Matteo....Those are definitely nice CAIs, but
definitely check out the CAI at this link!!!
http://www.arizonaskiesmeteorites.com/AZ_Skies_Links/NWA_2364/
index.html
Cheers
-John
M come Meteorite Meteorites wrote:
This is others nice CAI's in my NWA CV
http://it.geocities.com/mcomemeteoritecollection/NWA1807.JPG
http://it.geocities.com/mcomemeteoritecollection/NWA2180gr.8.9.JPG
Matteo
--- Martinh <[EMAIL PROTECTED]> ha scritto:
Hi All,
At the Tucson show, I picked up a nice NWA end
section with a wonderful CAI. I know, I know, its not an historic
L6, but it
is pretty cool anyway.
When I do talks about the solar system, I like to
pass around a CAI for the obvious reasons. Now I can hold one up
in front
of a class and everyone can see it.
Here are some pics of the piece:
http://challenge.isu.edu/nwa2086.html
Notice the smaller CAI island that drifted off the
mainland, looking somewhat like Madagascar off the east coast of
Africa.
Any thoughts on the CAI would be appreciated.
Happy viewing.
Martin H
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