Re: [meteorite-list] CR Chondrites

[Michael Farmer]

Tom, that is a common trait of CR meteorites, want to see, check these 
babies out. http://www.meteoriteguy.com/NWA801.htm
As you can see in many of the pieces, the actual chondrules are metal rich, 
so this must have formed in a very interesting way. Imagine how the cloud 
must have looked with all that metal and silicates condensing.
The CR meteorites are among the most beautiful meteorites out there.
Mike Farmer
----- Original Message ----- 
From: "Tom AKA James Knudson" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Wednesday, November 24, 2004 7:54 PM
Subject: Re: [meteorite-list] CR Chondrites


Hello Bernd and list. I am just curious about CR's because I read 
something
about them having metal inside the chondrules. I was wondering if CR's 
were
the only meteorite with this feature. I am not implying my meteorite is a
CR, but I had thought it was weird because the white inclusions were full 
of
metal. Is this common for inclusions? Would the metal get inside an
inclusion the same way it would a chondrule? (see link if you don't 
remember
the meteorite)

http://www.geocities.com/alosthawker/MVC-032S.JPG
Thanks, Tom
peregrineflier <><
IMCA 6168
http://www.frontiernet.net/~peregrineflier/Peregrineflier.htm
----- Original Message -----
From: <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, November 24, 2004 12:19 PM
Subject: [meteorite-list] CR Chondrites

Hello Tom and List,
I've told you at least once before and I am telling you once again:
Please, stop imparting a feeling of inferiority to yourself and don't
keep telling the world that you are what you call "stupid". Just think
of your falcons - they are proud, majestic creatures even though they
don't know anything about meteorites. Ignorance is one thing, stupidity
another and it has many different facets as we all know so well  ;-)
As for CR meteorites, here is a slightly shortened version from NORTON
O.R.
(1998) Rocks From Space II, p. 195: "CR chondrites ... contain about 10 %
by
weight iron-nickel metal and iron sulfide. The metal content is the most
easily
distinguished characteristic. The metal is found in the fine-grained
matrix and
as inclusions in the chondrules. Roughly 50 percent of the meteorite is
relatively
large chondrules (0.027-inch average diameter) and chondrule fragments."
O.R. Norton's descriptive explanation is not *too* technical and good
enough
as a first approach. I would only add that more often than not CR
chondrules
are surrounded by a metallic rim, in other words they are armored. One
might
also add that, although they do not look "carbonaceous" at first sight,
they
are considered members of this group because their compositions are
similar
to those of the carbonaceous chondrites.
Best wishes,
Bernd (still in love with his gorgeous, cut 7.23-gram CR2
crusted endpiece purchased from Dean in May of 2003)
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