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

From: Katsu OHTSUKA <ohtsuka_at_meteoritecentral.com>
Date: Thu, 4 Mar 2010 14:57:09 +0900
Message-ID: <78AF1FCD3340452AB9203A1A954C59ED_at_KATSU>

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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>>
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Received on Thu 04 Mar 2010 12:57:09 AM PST