[meteorite-list] Classification of Chondrites

From: Rhett Bourland <rbourlan_at_meteoritecentral.com>
Date: Thu Apr 22 09:50:24 2004
Message-ID: <IOEBKAHMGFBDJMOFGDFNMEKMDIAA.rbourlan_at_evansville.net>

Hi Michael,
There's a very good chance I'll totally miss the mark here but from what
I've been able to gather chondrules are not the only way in which numeric
grades assigned.
Though a certain meteorite (in this case Cole Creek) may have quite a few a
chondrules in it I'm pretty sure the homogenity of the olivine and pyroxene
play a role in it. If I remember correctly I think that 3's olivine and
pyroxene are not homogenous. 3's are known as unequilibriated chondrites
because the olivine and pyroxene have varying amounts of Mg and Fe. 4's
have pyroxene have become equilibriated but still has various forms of
olivine. 5's have equilibriated pyroxene and olivine. Not exactly sure how
6's fit into this scheme of things though.
If anyone could possibly clarrify this (or even point out how I don't have a
clue what I'm talking about) by all means please do share with us because I
don't mind being wrong just as long as someone is kind enough to show me how
to be right.
Best wishes,
Rhett Bourland
www.asteroidmodels.com
www.asteroidmodels.com/personal
www.meteoritecollectors.org

-----Original Message-----
From: meteorite-list-admin_at_meteoritecentral.com
[mailto:meteorite-list-admin_at_meteoritecentral.com]On Behalf Of Michael
Blood
Sent: Sunday, April 07, 2002 8:01 PM
To: Bernd Pauli HD
Cc: Fred Olsen; meteorite-list
Subject: [meteorite-list] Classification of Chondrites


Bernd Pauli HD wrote:
.........
> Slight correction: Cole Creek is an H5 chondrite. So far,
> so good (or bad). We discussed this about 18 months ago
> and when I got my Cole Creek thin section from Michael
> Blood, I got almost drowned in a sea of chondrules. But it
> does have a fayalite content (another important parameter)
> of 18.5 and this makes it clearly an H chondrite although
> not necessarily an H5 chondrite :-(
........
> Best wishes,
> Bernd
> ______________________________________________
Hi Bernd, Fred & all,
        It has always amazed me that Cole Creek is classified as a
5. I understand the "H" classification - but not the "5" - can
you, Bernd, or, anyone, tell us why a meteorite with such
clearly distinct and well defined (as well as colorful) chondrules
can be a "5?" (I REALLY wanna know...)
        Thanks, Michael

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Received on Sun 07 Apr 2002 09:23:34 PM PDT