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

From: Shawn Alan <photophlow_at_meteoritecentral.com>
Date: Wed, 3 Mar 2010 17:03:47 -0800 (PST)
Message-ID: <584758.86626.qm_at_web113619.mail.gq1.yahoo.com>

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

Pikachu is Peekskillchu
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One down, 38,659 to go, got to collect them all. Po-ke-monerites!!!
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Shawn Alan
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[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

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

>>> ______________________________________________

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>>>

>>

>>

>>

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Received on Wed 03 Mar 2010 08:03:47 PM PST