[meteorite-list] Spade Versus Estacado

From: j.divelbiss_at_att.net <j.divelbiss_at_meteoritecentral.com>
Date: Thu Apr 22 10:16:37 2004
Message-ID: <20030829224651.040C7535A7_at_pairlist.net>

Adam, Michael and especially Matt,

I received a part slice of Spade from Matt today and I have to say that it is
an extraordinary meteorite. In my collection I have nice slices of melts that
include Chico(L6), Sahara 98362(H6), Dhofar 010(H6), Gao?(H5? from Eric
Olsen), and a nice small cut up individual from NWA(unclassified) that are
all superb. Spade is easily nicer than all of these materials. I do not have
Cat Mountain but from the pictures I've seen, Spade is nicer than it in my
opinion. Spade does not appear to have areas that are more melted than other
areas like Cat Mountain and Dhofar 010 do.

The intimate mix of lots of nice metal with the blackened matrix is just
beautiful. Especially the polished side. The fractured edges have more of a
glassy gray-metal look to it. The vesicles are evident but not as numerous as
some melts. My piece has some vein-like areas where the metal is
discontinuous but definitely in a pattern. Relic chondrules and inclusions
are few and far between. (a thin section would be a better way to check for
those)

If Estacado is paired with Spade then it must be a favorite meteorite for
others. Spade sure looks like unique material...though my experience is
somewhat limited.

Thanx for the opportunity Matt,

John

 
> Hi Michael and List,
>
> I was not questioning Matt's integrity at all. Both meteorites were found
> in Texas less than 35 miles apart and are very similar in appearance. Since
> finely metal-grained H6s with dark matrixes and low shock are rare I feel a
> pairing must be considered. In any case both Spade and Estacado are
> beautiful stones.
>
> All the best,
>
> Adam
>
>
> ----- Original Message -----
> From: "Michael L Blood" <mlblood_at_cox.net>
> To: "Adam Hupe" <adamhupe_at_comcast.net>;
> <meteorite-list_at_meteoritecentral.com>; <bernd.pauli@paulinet.de>
> Sent: Friday, August 29, 2003 11:29 AM
> Subject: Re: [meteorite-list] Spade Versus Estacado
>
>
> > Bernd's observations and opinion are good enough for this cowboy.
> > Also, isn't Matt's meteorite a US find? Matt's integrity is beyond
> > question in my book.
> > Michael
> >
> >
> > on 8/29/03 9:00 AM, Adam Hupe at adamhupe_at_comcast.net wrote:
> >
> > > Dear List Members,
> > >
> > > If somebody wants to sell an Estacado specimen and a Spade specimen to
> us at
> > > the Denver show we would be happy to donate them to a world class
> researcher
> > > who will also be at the show for comparative purposes. We are in the
> > > process of working with several laboratories to sort out NWA pairings
> > > (mainly the stony-irons) and have provided several samples to each
> facility.
> > > We have found that shock and weathering levels amongst other things are
> > > variable even from the same strewn field in many cases.
> > >
> > > The evenly disbursed, fine-grained metal gives Estacado the appearance
> that
> > > there is more metal than there actually is. I have only seen this
> texture in
> > > one other H chondrite and that is NWA 1792 before looking at Spade. Add
> the
> > > darkened matrix and you have a pretty stunning looking meteorite. After
> > > cutting thousands of NWA meteorites I have only seen this texture once,
> in
> > > my opinion making it rare. I think all suspected pairings should be
> > > investigated to keep the books clean, so to speak.
> > >
> > > All the best,
> > >
> > > Adam Hupe
> > >
> > >
> > >
> > >
> > >
> > >
> > > ----- Original Message -----
> > > From: <bernd.pauli_at_paulinet.de>
> > > To: <Meteorite-list_at_meteoritecentral.com>
> > > Sent: Friday, August 29, 2003 8:38 AM
> > > Subject: [meteorite-list] Spade Versus Estacado
> > >
> > >
> > >> Hello once again,
> > >>
> > >> Another possible inconsistency:
> > >>
> > >> My Estacado thin section measures 2.3 x 1.6 cm (3.68 cm^2)
> > >> and I found at least 7 relict POP chondrules and 1 relict, barred
> > >> chondrule.
> > >>
> > >> This would also be in clear contrast to A.E. Rubin's statement:
> > >>
> > >> "The impact melt origin of [Spade] is indicated by the low
> > >> modal abundances of relict chondrules (1.8 vol.%) ..."
> > >>
> > >> Bernd
> > >>
> > >>
> > >> ______________________________________________
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> > >
> > >
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> >
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Received on Fri 29 Aug 2003 06:46:48 PM PDT