[meteorite-list] Fw: Rocks from Space Picture of the Day / NWA 4024

Sun Feb 24 20:18:50 EST 2008

"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" <majbaermann at web.de>
To: "Razvan Andrei" <asean-1 at xnet.ro>; <meteorite-list at 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" <asean-1 at xnet.ro>
> To: <Meteorite-list at 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" <p.marmet at mysunrise.ch>
>> To: "Meteoritenliste" <Meteorite-list at 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
>>> p.marmet at mysunrise.ch
>>> http://www.marmet-meteorites.com/
>>> ebay: http://search.ebay.com/_W0QQsassZpema9
>>>
>>>
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>> Vodafone automatically scans all messages for viruses using Trend Micro
>> VirusWall.
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>> 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
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