"Winonaites are composed largely of fine-grained pyroxenes, minor
magnesium-rich olivine, the iron-sulfide troilite, and nickel-iron metal.
The total iron content ranges between 18% and 30% among members of this
group, possibly a factor of the close relationship that exists between the
winonaites and silicate inclusions in IAB iron meteorites. These silicate
inclusions are very similar to the winonaites in chemistry and mineralogy,
and they exhibit the same unique oxygen isotopic composition. Recent
research suggests that both the winonaites and IAB irons originated on the
same parent body - a partially differentiated asteroid that was disrupted
just as it began to form an iron core and a silicate-rich crust. This
disrupting impact mixed silicates into molten nickel-iron forming the
silicated IAB irons, and mixed olivine-rich residues of partial melts into
unmelted silicates, forming the winonaites."
http://www.meteorite.fr/en/classification/PAC-group.htm
In any case it will be necessary to wait until an exact analysis and
classification will reveal whether both aspects - winonaite / silicated iron
(IAB) - can be identified with one and the same meteorite.
Best, Matthias
----- Original Message -----
From: "Matthias Bärmann" <[EMAIL PROTECTED]>
To: "Razvan Andrei" <[EMAIL PROTECTED]>; <meteorite-list@meteoritecentral.com>
Sent: Monday, February 25, 2008 1:29 AM
Subject: Re: [meteorite-list] Rocks from Space Picture of the Day / NWA 4024
Hello Andrei,
I'm not sure but as far as I remember exactly this question was - and
perhaps still is - in discussion in regard to Winona and Canyon Diablo.
My best,
Matthias
----- Original Message -----
From: "Razvan Andrei" <[EMAIL PROTECTED]>
To: <Meteorite-list@meteoritecentral.com>
Sent: Monday, February 25, 2008 1:11 AM
Subject: Re: [meteorite-list] Rocks from Space Picture of the Day / NWA
4024
Hi list
I wonder where is the line between a high metal winonaite
and a silicated iron as in some irons, the silicate inclusions
are winonaitic.
Maybe analyses made on a piece where silicates are dominant
can give a winonaite classification and on other pieces of the
same fall with dominant iron can give an iron classification ?
I'm asking because I have some pieces of NWA 4024 with
silicates and some without, only irons, and recently I cut some
small iron meteorites from Morocco and found them very similar
with the irons from NWA 4024.
Shall I call them irons ? or metal inclusions from a W chondrite ?
Best Regards,
Andrei
----- Original Message -----
From: "Peter Marmet" <[EMAIL PROTECTED]>
To: "Meteoritenliste" <Meteorite-list@meteoritecentral.com>
Sent: Sunday, February 24, 2008 3:08 PM
Subject: Re: [meteorite-list] Rocks from Space Picture of the Day / NWA
4024
Hello All,
http://www.rocksfromspace.org/February_24_2008.html
We have several pieces of very likely the same meteorite.
First we thought it might be paired with NWA 2680.
Further analyses at the Nat. Hist. Museum in Bern showed that this is
not the case:
Ni 8.58 und 7.82 % (NWA 2680: 13.7%)
Co 0.47 und 0.46 % (NWA 2680: 0.54%)
Cu <10 ppm (NWA 2680: 548 ppm)
Ni and Cu contents show that our material is very likely not paired
with NWA 2680.
Then we saw high res. picts of NWA 4024 and noticed that our material
looks visually identical to NWA 4024.
We sold several pieces on ebay as "new iron" last year.
Unfortunately the museum in Bern could not classify our material, so we
sent 25 grams to Dr. Greshake
in Berlin. To be sure that it is the same material as NWA 4024, he
suggested to make an O-Isotope analysis which he can't do
himself but scientifists in England he is working with. But it seems
that our material is right at the bottom of the
priority list of these English scientists - so we have to be patient.
As soon we have the results from England, we will inform you and put
some of our material on ebay again.
For those who already have bought from our material and are waiting for
the final results....thank you for being so patient!
Peter
Peter Marmet
Bern, Switzerland
IMCA #2747
[EMAIL PROTECTED]
http://www.marmet-meteorites.com/
ebay: http://search.ebay.com/_W0QQsassZpema9
______________________________________________
http://www.meteoritecentral.com
Meteorite-list mailing list
Meteorite-list@meteoritecentral.com
http://six.pairlist.net/mailman/listinfo/meteorite-list
_______________________________________________________________
Vodafone scaneaza automat toate mesajele impotriva virusilor folosind
Trend Micro VirusWall.
Vodafone automatically scans all messages for viruses using Trend Micro
VirusWall.
_______________________________________________________________
Nota: Este posibil ca produsul Trend Micro VirusWall sa nu detecteze
toti virusii noi sau toate variantele lor. Va rugam sa luati in
considerare ca exista un risc de fiecare data cind deschideti fisiere
atasate si ca Vodafone Romania nu este responsabila pentru orice
prejudiciu cauzat de decizia dvs.
Disclaimer: It is possible that the Trend Micro VirusWall product may
not be able to detect all new viruses and variants. Please be aware that
there is a risk involved whenever opening e-mail attachments to your
computer and that Vodafone Romania is not responsible for any damages
caused by your decision to do so.
_______________________________________________________________
Vodafone scaneaza automat toate mesajele impotriva virusilor folosind
Trend Micro VirusWall.
Vodafone automatically scans all messages for viruses using Trend Micro
VirusWall.
_______________________________________________________________
Nota: Este posibil ca produsul Trend Micro VirusWall sa nu detecteze toti
virusii noi sau toate variantele lor. Va rugam sa luati in considerare ca
exista un risc de fiecare data cind deschideti fisiere atasate si ca
Vodafone Romania nu este responsabila pentru orice prejudiciu cauzat de
decizia dvs.
Disclaimer: It is possible that the Trend Micro VirusWall product may not
be able to detect all new viruses and variants. Please be aware that
there is a risk involved whenever opening e-mail attachments to your
computer and that Vodafone Romania is not responsible for any damages
caused by your decision to do so.
______________________________________________
http://www.meteoritecentral.com
Meteorite-list mailing list
Meteorite-list@meteoritecentral.com
http://six.pairlist.net/mailman/listinfo/meteorite-list
______________________________________________
http://www.meteoritecentral.com
Meteorite-list mailing list
Meteorite-list@meteoritecentral.com
http://six.pairlist.net/mailman/listinfo/meteorite-list
______________________________________________
http://www.meteoritecentral.com
Meteorite-list mailing list
Meteorite-list@meteoritecentral.com
http://six.pairlist.net/mailman/listinfo/meteorite-list
