[meteorite-list] Monthly Favourite - September 2007

[star-bits at tx.rr.com]

Brend wrote:

<BTW, my 11.51-gram NWA 3118 features one of the most massive CAI's 
(9.5 x 4 mm) I've ever seen in any of my carbonaceous chondrites with 
the exception of the ones Eric Olsen sold some time ago - NWA 2140 ... 
unfortunately not classified yet. One of the pieces from Eric has a CAI 
measuring even 9.5 x 7.5 mm!>

NWA 2140 was classified and "supposedly" submitted for approval a couple times by Ted Bunch, but as far as I know it was never received by the nomenclature committee.   Ted said it was paired with NWA 3118 and you can see some info on it at the following URL

<http://www4.nau.edu/meteorite/Meteorite/CV_CarbChond.html>

Here is a photo of one of the slices with a large CAI which also has a small dark inclusion.   The CAI was about 12x11mm.

<http://star-bits.com/cv3/cv3wt18-22a.JPG>

This piece also had a couple CAIs with chondritic inclusions in them.   There is a photo

<http://star-bits.com/listphotos/cv-1.JPG>

--
Eric Olson
7682 Firethorn Dr
Fayetteville, NC 28311

http://www.star-bits.com

---- bernd.pauli at paulinet.de wrote: 

=============
www.meteorites.com.au/favourite/september2007.html


This is surely an awesome CV3 chondrite that is full of surprises
and I am glad I purchased 6 specimens, 4 of which have these DI's.

Of special interest is the DI in Jeff's 1.55-gram complete slice.
Like my 4.97-gram specimen, it shows a comminuted matrix of very
small, distorted chondrules and mineral fragments and a medium-gray
rim that maybe represents shock-melted material. This rim is virtually
devoid of chondrules and only shows tiny mineral debris.

Jeff, have you already emailed Ted Bunch? Does he have some thoughts
on these DI's?

BTW, my 11.51-gram NWA 3118 features one of the most massive CAI's
(9.5 x 4 mm) I've ever seen in any of my carbonaceous chondrites with
the exception of the ones Eric Olsen sold some time ago - NWA 2140 ...
unfortunately not classified yet. One of the pieces from Eric has a CAI
measuring even 9.5 x 7.5 mm!

Another interesting feature of my 11.51-gram slice is that both chondrules
+ massive CAI show what is called "preferred orientation" and almost all
these chondrules are - just like this CAI - slightly or perceptibly oval.

Cheers,

Bernd


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