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Re: Meteorite Classification
- To: meteorite-list@meteoritecentral.com
- Subject: Re: Meteorite Classification
- From: Jeff Grossman <jgrossman@usgs.gov>
- Date: Tue, 07 Apr 1998 07:54:15 -0400
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- Resent-Date: Tue, 7 Apr 1998 08:57:12 -0400 (EDT)
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Here is what I think is a better classification of meteorites,
mostly off the top of my head, but reflecting the views of
many current researchers.
Excuse me if I forgot anything. There are lots of oddballs.
jeff
===============================================================
Chondrites
Group Pet types known
Carbonaceous
Ivuna-type CI 1
Mighei-type CM 1-2
Ornans-type CO 3.0-3.7
Vigarano-type CV 3
Renazzo-type CR 2
Karoonda-type CK 3-6
ALH85085-type CH 3?
Ungrouped many individuals
Probably related to carbonaceous
Kakangari-type K 3
Enstatite
High-iron group EH 3-5
Low-iron group EL 3-6
Ordinary
High-iron group H 3.2-3.9,4-7
Low-iron group L 3.1-3.9,4-7
Low-iron, low-metal LL 3.0-3.9,4-7
Probably related to ordinary
Rumuruti-type R 3-6
Ungrouped
Achondrites
Primitive (from undifferentiated bodies)
Angrites
Acapulcoites
Brachinites
Lodranites
Ungrouped (e.g., the E-chondrite melt rocks,
Ilafegh 009 and Happy Canyon)
Aubrites (enstatite achondrites)
Ureilites
HED group (Vesta meteorites?)
Eucrites (basalt)
[various subdivision schemes]
Diogenites (cumulates)
Howardites (breccias)
Martian meteorites
Shergottites (basalt)
Nakhlites (CPX-rich cumulate)
Chassignite (dunite)
ALH84001 (OPX-rich cumulate)
Lunar meteorites
Basaltic breccias
Anorthositic breccias
Gabbros
Metal-rich meteorites
Mesosiderites
[various subdivision schemes]
Pallasites
Main group
Eagle Station group
"pyroxene"
Ungrouped
(Bencubbin, Weatherford, Steinbach, etc.)
Iron meteorites
Magmatic (cores) [this distinction is not
universally accepted]
IIAB group
IIC group
IID group
IIF group
IIIAB group
IIIE group
IIIF group
IVA group
IVB group
Non-magmatic [this distinction is not universally
accepted]
IAB group
IIE group
IIICD group
Ungrouped
many, many individuals
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