[meteorite-list] Sikhote crust-chondrite / Could this be one of the rarest meteorites found?
wahlperry at aol.com
wahlperry at aol.com
Wed Nov 18 19:45:42 EST 2009
Hi Jason and all,
Thanks for all the replies. From the sounds of things there is no way
to tell what the rarest meteorite might be. This might not be the
rarest meteorite, but my favorite is the Portales Valley that we found
a couple years ago.
Thanks,
Sonny
-----Original Message-----
From: ensoramanda at ntlworld.com
To: Meteorite-list <meteorite-list at meteoritecentral.com>; Jason Utas
<meteoritekid at gmail.com>
Sent: Wed, Nov 18, 2009 3:43 pm
Subject: Re: [meteorite-list] Sikhote crust-chondrite / Could this be
one of the rarest meteorites found?
Hi Jason, All,Not classed as a silicated iron but...I have a nice end
cut of Portales valley with about a 2:1 silicate, iron mix that shows
an intriguing mix of fusion crusts flowing one into the other.Graham,
UK---- Jason Utas <meteoritekid at gmail.com> wrote: > Carl, All,> Wow,
thanks for that...hum.> Right - I think people are confusing rarity
with desirability, market> value, and collector availability, when
these are all really distinct> terms.> Right, it's all about O-isotopes
now, but I'm not really sure why - it> seems to me that chemistry
should be just as important...surely there> could have been parent
bodies forming in the same general areas as> each other that were
distinct bodies, but that, due to their relative> proximity, have
similar or identical O-isotope values. I don't know -> maybe that is
how we group things...seems illogical to me, though.> > The trouble
with "fusion crust..."> If I recall, a while back, Elton made some
strange comments about a> fusion crust having to be composed of
siliceous material and> impurities such as oxides etc. He argued that,
because the crust that> forms on irons lacks silicates, it is not a
true fusion crust.> > The consensus of the list was that the crust that
forms on irons may> be chemically distinct from the crust that forms on
stones, but it is> for all intensive purposes analogous in pretty much
every way to the> stony version, so we might as well call them the same
thing.> > I think the reason we don't see much in the way of fusion
crust on> silicated irons is because, well, there aren't many fresh
silicated> irons around. There are plenty of examples of crusted irons
- and> with just over 50 iron falls, some of which are accessible to>
collectors, well, they're there to be seen. I don't know how many of>
those ~50 iron falls are silicated, but I do know one thing - of all>
of them, Udei Station's the only one that's available in any real>
quantity, and I've never seen an example with good crust. I don't>
think that's because it didn't form a fusion crust - I just think that>
such pieces aren't widely available, so they remain out of our field>
of view, for the most part...> > Think of Estherville, things like
that. They're made of a pretty even> mix of iron and stone and they
still form a fusion crust.> > I have a ~4.7g 1/2 end of Bencubbin that
shows some pretty spectacular> warty fusion crust...I can get some
pictures up if you'd like. I> figure that's about 1/2 stone and metal
as well, so...yeah.> > Regards,> Jason> > On Wed, Nov 18, 2009 at 10:26
AM, <cdtucson at cox.net> wrote:> > Jason, I would first like to say that
if there were an award for most helpful and kind on this list you would
be the winner.> > I truly believe you offer more good information than
anyone else on this list. That says a lot because there are a ton of
great people on this list. And I want to thank you for all you do. You
are a tremendous person.> >> > I think you are 100% correct with this
evaluation as you describe it. But, There is something to desirability
/ Valuable in the formula of "rare".> > Just because something is rare
does not mean it is desirable or valuable. To me rarely is irrelevant
if not desirable. As you correctly point out. Who cares about your L6.
So, to me the rarest meteorite that has those things has got to be the
meteorite that every collector wants the most.> > That said it would be
a subjective call but for me it would be ALH 84001.> > Lastly, Your
reference to Jeff Grossman are correct but I notice that Oxygen
isotopes rule in this biz. If the air matches , then that is where it
is from and therefore that is what it is.> > A recent example of this
is GRA 06128. They are calling it a brachinite based on Isotopes even
though it is not related in other ways to the brach clan. So,
apparently the where it is from needs more specific categories like
Mars now has four different categories.> > Anyway, I wanted to thank
you for all your information. I know I had never seen actual fusion
crust on any iron before yours. I have seen a lot of impostors but
yours is truly the real deal.> > Has anyone ever studied that crust to
determine what it is made up of? It seems from an earlier thread that
the crust must be a mixture of the silicates within this meteorite.
Because most other irons without silicates within them do not seem to
leave a true fusion crust like your sikhote did? Thanks Carl> > --> >
Carl or Debbie Esparza> > Meteoritemax> >> >> > ---- Jason Utas
<meteoritekid at gmail.com> wrote:> >> Hello Sonny, All,> >> I've often
thought about such a term - "the rarest meteorite."> >> The rarest
meteorite would of course be smallest ungrouped meteorite,> >> for one
could feasibly conceive of a 1-2g unique meteorite. When a> >> new
type is named, however, a hype generally surrounds it - rather> >> like
the olivine diogenite craze of a few years ago, or the confusion> >>
surrounding Bencubbinites, and other poorly defined types of> >>
meteorites.> >> The simple fact of the matter is that there meteorites
are too often> >> categorized by our current system into associations
and groups into> >> which they fit rather poorly; Jeff Grossman states
as much in the last> >> thread surrounding the poor chemical and
isotopic relationships> >> between many basaltic meteorites deemed
"eucrites."> >> But regardless of this fact, a simple truth remains.
There are> >> countless ungrouped meteorites and several
Kakangari-type meteorites,> >> so while they may be one of the least
common "types," they are by no> >> means examples of the "rarest"
meteorite known.> >> Regards,> >> Jason> >>> >> On Tue, Nov 17, 2009 at
6:12 PM, <wahlperry at aol.com> wrote:> >> > Hi Bernd and list,> >> >> >>
> Would this be one of the rarest meteorites ever found? If not, what>
>> > meteorite would be?> >> >> >> > Thanks,> >> > Sonny> >> >> >> >>
>> > -----Original Message-----> >> > From: bernd.pauli at paulinet.de> >>
> To: Meteorite-list at meteoritecentral.com> >> > Sent: Tue, Nov 17, 2009
1:12 pm> >> > Subject: [meteorite-list] Photo of a K-chondrite> >> >>
>> >> >> >> >> >> >> >> >> >> >> >> >> > Hi Greg and List,> >> >> >> >
Hardly any photos of Kakangaris exist. You'll find one on David> >> >
Weir's excellent website: http://www.meteoritestudies.com/> >> >> >> >
Click on chondrites and then scroll down to Kakangari!> >> >> >> > Thin
section pics of Kakangari can be found here (on pages 202-205):> >> >>
>> > D.S. LAURETTA, M. KILLGORE (2005) A Color Atlas of Meteorites in
Thin> >> > Section> >> > (Golden Retriever Publications and Southwest
Meteorite Press, ISBN> >> > 0-9720472-1-2, 301 pp.).> >> >> >> >> >> >
Best wishes,> >> >> >> > Bernd> >> >> >> >
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