[meteorite-list] CR Chondrites

From: Tom AKA James Knudson <peregrineflier_at_meteoritecentral.com>
Date: Wed Nov 24 21:54:45 2004
Message-ID: <010501c4d29a$0ee19d80$2d107918_at_Michelle>

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: <bernd.pauli_at_paulinet.de>
To: <Meteorite-list_at_meteoritecentral.com>
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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Received on Wed 24 Nov 2004 09:54:14 PM PST