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  4 - January - 2020


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NWA 12951   contributed by Albert Jambon, IMCA 9347   MetBul Link
 


Roll Overs:     #1   #2   #3    


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Photos by T. Mouchet / Space Birds.   Copyright (c) Space Birds.
4574 grams.   Winonaite

TKW 8.03 kg. Fall not observed. Purchased August 2019, Nouakchott, Mauritania.

MPOD Moderator writes:
Original photo plus 2 copies with different degrees of adjustment. Feedback is appreciated.

 


Albert writes:
The largest winonaite find after Winona. The three stones (4575 g/ 14 cm on display, 2325 g and 1029 g) exhibit a similar physical aspect. About 80% of the surface is wind ablated with prominent metal wedges and depressed silicate clasts. Whenever large metal areas are exposed Widmanstätten pattern is visible as thin shiny taenite bands separating millimetric kamacite with a greenish oxidized surface. Metal edges may be shiny otherwise covered with dark oxide.

The bottom side of the stones are covered with remnants of weathered fusion crust. Poorly shaped regmaglypths are observed in relation with the irregular texture of the rock (metal and troilite filled fractures separating silicate clasts). Fine grained olivine and emerald green pyroxene are observed where the crust is missing. Very fresh, unlike Winona.

According to their oxygen isotopic composition, the silicate part of winonaites derive from a differentiated parent body. Their texture indicates they are breccias with a metal matrix derived from a large parent body.


  Click to view larger photos     Photo 1     Photo 2     Photo 3
 


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1 picture in the Queue
MexicoDoug
 1/10/2020 3:19:57 PM
Thanks for sharing Albert! What a wonderful find, and I'm so glad you don't forget Winona in your description ;-)
Anne Black
 1/4/2020 2:15:14 PM
I agree with Graham, photo #3 looks too manipulated, not "real".
Bernd Pauli
 1/4/2020 11:14:41 AM
Photo 1 looks too dull. I prefer photo 3 because the light/dark contrast is very pronounced.
Graham Ensor
 1/4/2020 7:01:55 AM
I prefer photo 2....3 looks too manipulated.
Graham Ensor
 1/4/2020 7:01:09 AM
Wonderful stone.
Michael farmer
 1/4/2020 6:37:30 AM
Ohh that*s a nice one!
Simon Bartlett
 1/4/2020 4:00:53 AM
Lovely piece. Re feedback, picture 2 shows greater detail but looks less artificial than picture 3.
 

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