[meteorite-list] NWA889

From: John Divelbiss <j.divelbiss_at_meteoritecentral.com>
Date: Thu Apr 22 10:00:06 2004
Message-ID: <002501c2273f$cd889b20$221d5a0c_at_0m824>

Adam,

Thanx for response.

Now that's two votes for 787, 869 and 900 pairings. As far as 904 goes...it
does look similar, and it does have melt inclusions, like others. But the
diogenite (which I have not seen or heard of in others, yet) and the crust
that you said is just plain ugly, make them different in at least two ways.
I know the crust is ugly because I have a nice end piece. With those two
items in mind I'll agree that 904 is not paired with the others. But again
it is only my opinion here agreeing with you.

John Divelbiss


----- Original Message -----
From: "Adam Hupe" <adamhupe_at_attbi.com>
To: <meteorite-list_at_meteoritecentral.com>
Sent: Tuesday, July 09, 2002 12:53 AM
Subject: Re: [meteorite-list] NWA889


> Dear List members,
>
> I have been asked the status of NWA 904 and how it compares to NWA 869,
900
> ect.. This is what we have observed so far:
>
> A.) The black clasts are impact melt areas not carbonaceous.
> B.) It appears to be a regolith breccia.
> C.) Although the chondrules vary in crispness from type 3 to 6 most of
them
> are type 5.
> D.) The crust is totally different than 869 and 900, is not as fresh and
has
> a rather odd warty texture.
> F.) The green diogenite looking clasts are achondritic.
> G.) NWA 904 has different zones which show different degrees of weathering
> and petrologic type.
> H.) I have a sample of NWA 869 and have seen hundreds of kilos of it at
the
> Tucson Gem and Mineral Show and it is not paired with NWA 904.
> I.) NWA 869 looks as if it might be paired to NWA 787, a very nice looking
> L6.
> J.) NWA 869 has had three different classifications L4, L5 and L6. I
guess
> it depends on the type samples that were provided to the laboratories. I
do
> not blame the research labs because most dealers only deposit a 20 gram
type
> sample. Sometimes this amount of material is not enough to cross the
> different petrologic boundaries and thus you can get many classifications
> for the same meteorite. Some dealers only send in a portion which they
> think will get the best classification, sharp chondrules, less weathering
> etc..
> K.) Although NWA 900 has black clasts it does not display the zoning of
NWA
> 904, has no green clasts and the weathering is consistent throughout the
> stone.
> L.) In my opinion NWA 787, 869 and 900 are paired. I have not seen NWA
995
> so I cannot comment on its pairing status.
>
> If we had more time we would do a bulk analysis on each of these to once
and
> for all settle the pairing question. Unfortunately the Microprobe we
lease
> is booked until September. We are working on some very exciting material
> that we are hoping to announce by then. I remember a time when scientist
> used scramble at the opportunity to study even ordinary chondrites.
>
> Wishing everybody the best,
>
> Adam Hupe
>
>
> ----- Original Message -----
> From: "John Divelbiss" <j.divelbiss_at_worldnet.att.net>
> To: <meteorite-list_at_meteoritecentral.com>; "rochette" <rochette@cerege.fr>
> Sent: Monday, July 08, 2002 4:17 PM
> Subject: Re: [meteorite-list] NWA889
>
>
> > Pierre and Rob,
> >
> > Thank you for responses about NWA 900 and 995. Melt, and not carbonacous
> for
> > 900...that is cool too...since I really like melts. We all look forward
to
> > more information on these. (Matteo...do you still think you have seen
> > achondrite clasts?...in another slice maybe?
> >
> > Question...has anyone suggested the same(achondrite clasts) for 869?
That,
> I
> > have not heard of.
> >
> > Greg and Adam...are you out there? What is the status on the
"collection
> in
> > a slice", or NWA 904?
> >
> > Now I'm (pretty) sure there are achondrite clasts in the 904 slice I
> > have...but if I've learned anything is that we should wait for the
> analysis.
> >
> > John
> >
> > PS Side note...my thin section of 869 from Jeff Rowell looks like I have
> an
> > L3+ something clast in a L5 or L6 matrix. Probably the slice is a
> brecciated
> > chunk of L6 clast with a chunk of L3+ matrix in the middle. See how we
> get
> > turned around. (Al...I used criteria 7 and 8 from page 87 of the
"Norton
> > Encyclopedia" to come up with my own classification). This is kind of
> > fun...but I'll stick to engineering.
> >
> > PSS Dean...by the way, you do have the best buy out there!
> >
> > ----- Original Message -----
> > From: "rochette" <rochette_at_cerege.fr>
> > To: <meteorite-list_at_meteoritecentral.com>
> > Sent: Monday, July 08, 2002 12:24 PM
> > Subject: [meteorite-list] NWA889
> >
> >
> > > Dear list
> > >
> > > several pieces from Matteo that were analysed carefully (microprobe,
and
> > so
> > > on) revealed that the clasts are not "exotic" (i.e. carbonaceous or
> > > achondritic) but just L6: black is impact melt and gray is moderately
> > > shocked, the matrix being L3.8. It remains to be demonstrated that
> > Matteo's
> > > pieces are really paired with Dean's. The pictures are not so
> similar....
> > >
> > >
> > > Pierre
> > >
> > >
> > >
> > > ______________________________________________
> > > Meteorite-list mailing list
> > > Meteorite-list_at_meteoritecentral.com
> > > http://www.pairlist.net/mailman/listinfo/meteorite-list
> > >
> >
> >
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>
>
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Received on Tue 09 Jul 2002 07:57:16 AM PDT