[meteorite-list] The Perils of Type Collecting - A Guide

From: Galactic Stone & Ironworks <meteoritemike_at_meteoritecentral.com>
Date: Thu, 4 Mar 2010 13:47:10 -0500
Message-ID: <e51421551003041047k661eb87ahb83db578ce819b67_at_mail.gmail.com>

Thanks to Carl, Katsu, Greg, Martin, and everyone else who provided
corrections and input on this list. I have made corrections and the
revised list is presented below :

Carbonaceous Chondrites :

CI (Ivuna)
CM1 (Mighei)
CM2 (subdivided into CM2.0 to CM2.6)
CM3
CO3 (Ornans) (subdivided into CO3.03 to CO3.7)
CV (Vigarano) (also CV2 and CV3)
CK (Karoonda) (CK4, CK5, CK6)
CR (Renazzo) (CR1, CR2, CR3)
CB (Bencubbin)
CH
CR ungrouped
C4 ungrouped
C ungrouped


Ordinary Chondrites :

Rumuruti R3 (subdivided into R3.5-6 to R3.9)
R4
R5
R6

LL (subdivided into LL3.0 to LL3.9)
LL4
LL5
LL5/6
LL6
LL6/7
LL7
LL impact melt

LL transitional (L/LL3 to L/LL6)
L (subdivided into L3.0 to L3.9)
L4
L5
L6
L6/7
L7
L impact melt

H/L transitional (H/L3 to H/L6 IMB, H/L3.6 to H/L3-4)
H (subdivided into H3.0 to H3.9)
H4
H5
H6
H7
H impact melt

ungrouped ordinary chondrites


Enstatite Chondrites :

EL (EL3 to EL7)
EL impact melt
EH/L
EH (EH3 to EH7)
EH impact melt
ungrouped enstatite chondrites

K (Kakangari)

Meta-chondrites (M-CV, M-CR, M-H, M-LL)


Primitive Chondrites :

Acapulcoite
Lodranite
Winonaites
ungrouped primitive chondrites


Achondrites :

Howardite (subdivided into fragmental breccia and regolith breccia)
Eucrite (monomict and polymict with each having subclasses)
Diogenite (monomict and polymict)
Olivine Diogenite
Dunite
Ureilite (monomict and polymict)


Martian achondrites :

Shergottite
Pyroxene-phyric basaltic shergottite
Olivine-phyric basaltic shergottite
Olivine-orthopyroxene-phyric basaltic shergottite
Pyroxene-peridotitic (Wehrlitic) shergottite
Lherzolitic shergottite
Diabasic shergottite

Nakhlite
Chassignite
Orthopyroxenite (ALH 84001)


Lunar Achondrites :

Feldspathic breccias
Regolith breccia
Fragmental breccia
Impact melt breccia
Granulitic breccia
Mafic-rich
Thorium-rich
KREEP-rich

Mingled Breccia
Mare Basalt


Other Achondrites :

Angrites (Plutonic and Basaltic)
Brachinite
Aubrite
ungrouped achondrites (Ibitira, Pasamonte, etc)


Stony-Irons :

Mesosiderites (1A,1B,2A,2B,2C,3A,3B,4A,4B)
ungrouped mesosiderites

Pallasites (Main Group, Eagle Station group, Pyroxene group)
Pallasite-am (anomalous, PMG-am, PMG-as)
ungrouped pallasites


Iron meteorites :

Note, iron meteorites are a can of worms. I will only focus on the
main chemical groups, and not the various grouplets and sub-types of
each main chemical group. Also note that many of these types include
silicated varities. Listing all of the known sub-types of irons would
require a LONG list resembling a flow-chart.

IAB
IC
IIAB
IIC
IID
IIE
IIF
IIG
IIIAB
IIIE
IIIF
IVA
IVB
ungrouped irons

----------------------

On 3/4/10, Katsu OHTSUKA <ohtsuka at jb3.so-net.ne.jp> wrote:
> CM2 (Mighei-type)
>
> Katsu
>
> ----- Original Message -----
> From: "Greg Stanley" <stanleygregr at hotmail.com>
> To: <cdtucson at cox.net>; <meteorite-list at meteoritecentral.com>;
> <damoclid at yahoo.com>; <meteoritemike at gmail.com>
> Sent: Thursday, March 04, 2010 9:29 AM
> Subject: Re: [meteorite-list] The Perils of Type Collecting - A Guide
>
>
>>
>> Murchison is a CM2
>>
>> Greg S.
>>
>> ----------------------------------------
>>> Date: Wed, 3 Mar 2010 19:12:20 -0500
>>> From: cdtucson at cox.net
>>> To: meteorite-list at meteoritecentral.com; damoclid at yahoo.com;
>>> meteoritemike at gmail.com
>>> Subject: Re: [meteorite-list] The Perils of Type Collecting - A Guide
>>>
>>> Good list,
>>> missing is the division between
>>> CBa Buencubbin
>>> CBb HAH 237
>>> CK3
>>> and Tagish lake is not ungrouped but I think is a C2.
>>> --
>>> Carl or Debbie Esparza
>>> Meteoritemax
>>>
>>>
>>> ---- Richard Kowalski wrote:
>>>> Thanks a lot Mike.
>>>>
>>>> I thought I had pretty much completed my type set a few months ago, but
>>>> now I see that I'm missed a few gradations that maybe I should pay
>>>> attention to.
>>>>
>>>> I think, for budgetary and sanity sake, I'll have to be selective in how
>>>>
>>>> fine my divisions are than to try to get every sub-type you mention!
>>>>
>>>> --
>>>> Richard Kowalski
>>>> Full Moon Photography
>>>> IMCA #1081
>>>>
>>>>
>>>> --- On Wed, 3/3/10, Galactic Stone & Ironworks wrote:
>>>>
>>>>> From: Galactic Stone & Ironworks
>>>>> Subject: [meteorite-list] The Perils of Type Collecting - A Guide
>>>>> To: "Meteorite List"
>>>>> Date: Wednesday, March 3, 2010, 4:18 PM
>>>>> Greetings Listees and fellow
>>>>> collectors,
>>>>>
>>>>> To the veteran collector, there will be little of interest
>>>>> in this
>>>>> post. This post is directed at the silent newbie or
>>>>> beginner lurkers
>>>>> who are sorting through this List and trying to find their
>>>>> way around
>>>>> the world of collecting meteorites.
>>>>>
>>>>> Many new collectors often want one of each type of
>>>>> meteorite. Many
>>>>> veteran collectors abandon this pursuit because the task is
>>>>> quite
>>>>> daunting. So when you hear talk about
>>>>> "type collecting", or building
>>>>> a "type collection", what exactly does that mean? I
>>>>> hope the
>>>>> following brief article will answer those questions, or at
>>>>> least point
>>>>> the reader in the right general direction. Note, I
>>>>> gleaned much of
>>>>> this type information from David Weir's authoritative
>>>>> website
>>>>> "Meteorite Studies" and from the Meteoritical
>>>>> Bulletin. I do not
>>>>> claim that this list is 100% complete or without error, so
>>>>> if the
>>>>> reader spots an error or omission, please reply and correct
>>>>> it.
>>>>>
>>>>> -----
>>>>>
>>>>> The Perils of Type Collecting ........
>>>>>
>>>>> I started out collecting meteorites with a small sample of
>>>>> NWA 4293 -
>>>>> an ordinary high iron chondrite of the H6 type. It was
>>>>> about the size
>>>>> of a dog-food kibble and it looked like one. But I was
>>>>> instantly
>>>>> hooked, and I wanted to have one each of the different
>>>>> types of
>>>>> meteorite. This is known as "type collecting" or building a
>>>>> "type
>>>>> collection".
>>>>>
>>>>> The danger of type collecting (besides the damage to one's
>>>>> checking
>>>>> account) is that the various petrologic types are
>>>>> subdivided into
>>>>> various grades according to metamorphism.
>>>>>
>>>>> For example, take the H chondrite group that my NWA 4293
>>>>> sample belonged to.
>>>>>
>>>>> There are H3 chondrites, H4 chondrites, H5 chondrites, and
>>>>> H6
>>>>> chondrites. Did I really need one each of these subtypes?
>>>>> Well, it
>>>>> depends on how deep a collector wants to go into the rabbit
>>>>> hole.
>>>>> There are distinct differences between the various H types.
>>>>> The number
>>>>> attached to each is more than just a simple weathering
>>>>> grade or shock
>>>>> grade. It represents a progession in the H-chondrite family
>>>>> from least
>>>>> altered to most altered. H3 chondrites are loaded with
>>>>> chondrules, H4
>>>>> have some chondrules, H5 has few chondrules, and H6 has
>>>>> virtually no
>>>>> visible chondrules. A new grade of H7 has been added as
>>>>> well. So, a
>>>>> collector could simply have a single Hx chondrite and say
>>>>> that the
>>>>> H-chondrites are represented. Or, the collector could have
>>>>> one each of
>>>>> the different subtypes from 3 to 7.
>>>>>
>>>>> Another peril is the changing of nomenclature. For example,
>>>>> the
>>>>> K-subgroup of carbonaceous chondrites was only recognized
>>>>> and
>>>>> designated in 1990. Up until then, Karoonda was considered
>>>>> a CV4
>>>>> meteorite of the Vigarano family. Now Karoonda is
>>>>> recognized as
>>>>> distinctly different type of carbonaceous chondrite, so it
>>>>> was made
>>>>> into it's own group. Now we have CK4, CK5, and CK6
>>>>> meteorites - all
>>>>> represent a progression in metamorphism and have visible
>>>>> (and
>>>>> chemical) differences from other grades. There are standout
>>>>> members of
>>>>> each subgroup, so where does one draw the line? Should the
>>>>> collector
>>>>> acquire a sample of Karoonda and be done with it? Or should
>>>>> the
>>>>> collector go out and track down CK4, CK5 and CK6
>>>>> meteorites? Again, it
>>>>> depends on how extensive and exhaustive a collector wants
>>>>> to be with
>>>>> their type collection. Budget will also play a role as
>>>>> well, because
>>>>> an exhaustive type collection is a daunting project.
>>>>>
>>>>> Lastly, one must consider the ungrouped meteorites. These
>>>>> are oddball
>>>>> meteorites that do not neatly fit into the pre-existing
>>>>> meteorite
>>>>> types. There are ungrouped chondrites, ungrouped
>>>>> achondrites, and
>>>>> ungrouped irons. No type collection can overlook these
>>>>> meteorites
>>>>> because some of them are types unto themselves with unique
>>>>> qualities.
>>>>>
>>>>> For those who want to build a definitive and complete type
>>>>> collection,
>>>>> here is a list of every known type and subtype of
>>>>> meteorite. This list
>>>>> was culled from other sources, including David Weir's
>>>>> authoritative
>>>>> "Meteorite Studies" website linked at the end of this
>>>>> post.
>>>>>
>>>>> Carbonaceous Chondrites :
>>>>>
>>>>> CI (Ivuna)
>>>>> CM1 (Murchison)
>>>>> CM2 (subdivided into CM2.0 to CM2.6)
>>>>> CM3
>>>>> CO3 (Ornans) (subdivided into CO3.03 to CO3.7)
>>>>> CV (Vigarano) (also CV2 and CV3)
>>>>> CK (Karoonda) (CK4, CK5, CK6)
>>>>> CR (Renazzo) (CR1, CR2, CR3)
>>>>> CB (Bencubbin)
>>>>> CH
>>>>> CR ungrouped
>>>>> C4 ungrouped
>>>>> C ungrouped (Tagish Lake, others)
>>>>>
>>>>>
>>>>> Ordinary Chondrites :
>>>>>
>>>>> Rumuruti R3 (subdivided into R3.5-6 to R3.9)
>>>>> R4
>>>>> R5
>>>>> R6
>>>>>
>>>>> LL (subdivided into LL3.0 to LL3.9)
>>>>> LL4
>>>>> LL5
>>>>> LL5/6
>>>>> LL6
>>>>> LL6/7
>>>>> LL7
>>>>> LL impact melt
>>>>>
>>>>> LL transitional (L/LL3 to L/LL6)
>>>>> L (subdivided into L3.0 to L3.9)
>>>>> L4
>>>>> L5
>>>>> L6
>>>>> L6/7
>>>>> L7
>>>>> L impact melt
>>>>>
>>>>> H/L transitional (H/L3 to H/L6 IMB, H/L3.6 to H/L3-4)
>>>>> H (subdivided into H3.0 to H3.9)
>>>>> H4
>>>>> H5
>>>>> H6
>>>>> H7
>>>>> H impact melt
>>>>> ungrouped ordinary chondrites
>>>>>
>>>>>
>>>>> Enstatite Chondrites :
>>>>>
>>>>> EL (EL3 to EL7)
>>>>> EL impact melt
>>>>> EH/L
>>>>> EH (EH3 to EH7)
>>>>> EH impact melt
>>>>> ungrouped enstatite chondrites
>>>>>
>>>>> K (Kakangari)
>>>>>
>>>>> Meta-chondrites (M-CV, M-CR, M-H, M-LL)
>>>>>
>>>>>
>>>>> Primitive Chondrites :
>>>>>
>>>>> Acapulcoite
>>>>> Lodranite
>>>>> Winonaites
>>>>> ungrouped primitive chondrites
>>>>>
>>>>>
>>>>> Achondrites :
>>>>>
>>>>> Howardite (subdivided into fragmental breccia and regolith
>>>>> breccia)
>>>>> Eucrite (monomict and polymict with each having
>>>>> subclasses)
>>>>> Diogenite (monomict and polymict)
>>>>> Olivine Diogenite
>>>>> Dunite
>>>>> Ureilite (monomict and polymict)
>>>>>
>>>>>
>>>>> Martian achondrites :
>>>>>
>>>>> Shergottite
>>>>> Pyroxene-phyric basaltic shergottite
>>>>> Olivine-phyric basaltic shergottite
>>>>> Olivine-orthopyroxene-phyric basaltic shergottite
>>>>> Pyroxene-peridotitic (Wehrlitic) shergottite
>>>>> Lherzolitic shergottite
>>>>> Diabasic shergottite
>>>>>
>>>>> Nakhlite
>>>>> Chassignite
>>>>> Orthopyroxenite (ALH 84001)
>>>>>
>>>>>
>>>>> Lunar Achondrites :
>>>>>
>>>>> Feldspathic breccias
>>>>> Regolith breccia
>>>>> Fragmental breccia
>>>>> Impact melt breccia
>>>>> Granulitic breccia
>>>>> Mafic-rich
>>>>> Thorium-rich
>>>>> KREEP-rich
>>>>>
>>>>> Mingled Breccia
>>>>> Mare Basalt
>>>>>
>>>>>
>>>>> Other Achondrites :
>>>>>
>>>>> Angrites (Plutonic and Basaltic)
>>>>> Brachinite
>>>>> Aubrite
>>>>> ungrouped achondrites (Ibitira, Pasamonte, etc)
>>>>>
>>>>>
>>>>> Stony-Irons :
>>>>>
>>>>> Mesosiderites (1A,1B,2A,2B,2C,3A,3B,4A,4B)
>>>>> ungrouped mesosiderites
>>>>>
>>>>> Pallasites (Main Group, Eagle Station group, Pyroxene
>>>>> group)
>>>>> Pallasite-am (anomalous, PMG-am, PMG-as)
>>>>> ungrouped pallasites
>>>>>
>>>>>
>>>>> Iron meteorites :
>>>>>
>>>>> Note, iron meteorites are a can of worms. I will only focus
>>>>> on the
>>>>> main chemical groups, and not the various grouplets and
>>>>> sub-types of
>>>>> each main chemical group. Also note that many of
>>>>> these types include
>>>>> silicated varities. Listing all of the known
>>>>> sub-types of irons would
>>>>> require a LONG list resembling a flow-chart.
>>>>>
>>>>> IAB
>>>>> IC
>>>>> IIAB
>>>>> IIC
>>>>> IID
>>>>> IIE
>>>>> IIF
>>>>> IIG
>>>>> IIIAB
>>>>> IIIE
>>>>> IIIF
>>>>> IVA
>>>>> IVB
>>>>> ungrouped irons
>>>>>
>>>>> I think that is all of them - as currently recognized by
>>>>> the
>>>>> Meteoritical Society Nomenclature Committee. If anyone can
>>>>> think of
>>>>> some I missed, please add them to this list.
>>>>>
>>>>> David Weir's Meteorite Studies website -
>>>>> http://www.meteoritestudies.com/
>>>>>
>>>>> Best regards and happy collecting!
>>>>>
>>>>> MikeG
>>>>>
>>>>>
>>>>> --
>>>>> ------------------------------------------------------------
>>>>> Mike Gilmer - Galactic Stone & Ironworks Meteorites
>>>>> http://www.galactic-stone.com
>>>>> http://www.facebook.com/galacticstone
>>>>> ------------------------------------------------------------
>>>>> ______________________________________________
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>>>>>
>>>>
>>>>
>>>>
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-- 
------------------------------------------------------------
Mike Gilmer - Galactic Stone & Ironworks Meteorites
http://www.galactic-stone.com
http://www.facebook.com/galacticstone
------------------------------------------------------------

Received on Thu 04 Mar 2010 01:47:10 PM PST