[meteorite-list] The Perils of Type Collecting - Got to collect them all!

Wed Mar 3 20:03:47 EST 2010

I got to collect them all, Po-ke-monerites.

Pikachu is Peekskillchu

One down, 38,659 to go, got to collect them all. Po-ke-monerites!!!

Shawn Alan

[meteorite-list] The Perils of Type Collecting - A GuideGreg Stanley stanleygregr at hotmail.com 
Wed Mar 3 19:29:00 EST 2010 

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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 

>>> ------------------------------------------------------------ 

>>> ______________________________________________ 

>>> Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html 

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>>> 

>> 

>> 

>> 

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