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MISSING: 9.04 kilogram Sikhote-Alin shrapnel individual   More Info


 
NWA XXX   contributed by Andreas Koppelt, IMCA 6161   MetBul Link


Roll Overs:     #1   #2   #3   #4    


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View all entries for   Meteorite (55)   Contributor (21)


Photos by Andreas Koppelt.   Copyright (c) Andreas Koppelt.
635.4 grams.   Unclassified

Andreas writes:
This single iron individual from Sahara has the shape between a flattened egg or an egg-shaped discus.

It shows distinct remains of the bluish-black fusion crust. The hard fusion crust (very thin, ~0.3-0.4 mm) obviously dissolved in chips. I guess this form of weathering is mainly based on the wide temperature range in the desert between day and night so that the thin layer expands and shrinks each day and night until it loses contact with the interior.

Some grinding marks show that the finder wanted to take a closer look inside or possibly they indicate the usage as a tool in ancient times. Bought at the Munich Mineral fair in 2017.


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NWA 1288
Bernd Pauli

This Month

Andi Koppelt
 5/2/2018 9:20:01 PM
Hi John, as long as there are no flowlines, radial regmaglypts, lippings or bubbles on the backside of a meteorite, I am not convinced to assume orientation. In this case I see not the slightest sign of it. Unfortunately... ;-)
John Divelbiss
 5/1/2018 1:05:07 PM
the streamline look to this specimen has to suggest some orientation?? ...the direction of orientation is the question I'm curious about. Rounded front and flat back is a good start but not always the case with other variations seen in shield/pancake type shapes. Photo #4 has the flattest surface shown with "grinding" that could be the backend or orientation which would suggest the front edge was flying like a Indian hatchet "stone" flying in a fixed position. Cool individual...
Andi Koppelt
 5/1/2018 11:20:41 AM
Thanks for your nice comments. Hard to say what kind of iron meteorite it is. Apparently there is no Widmannst*tten pattern visible, possibly some little rhabdite planes show up on the grinded side? I don*t believe it*s Taza for most Tazas show more or less orientation (missing here completely). Furthermore a finder would hardly grind a find from a well known strewn field to have a look inside a Taza. But who knows, maybe John is right? I hope to get the chance to make an X-ray fluorescence analysis once to check the nickel content, but presumably this piece will stay uncut to preserve its shape. The unsolved riddle... ;-)
John Divelbiss
 5/1/2018 5:45:30 AM
Taza was my first thought when I saw the pictures...and I thought I was looking at and unclassified stone. When I read that it was iron...still Taza??
Bernd Pauli
 5/1/2018 2:23:30 AM
Though unetched, photo #4 might show traces of a Widmanstaetten pattern but there is none. What about a IIAB iron, a plessitic iron or an ataxitic iron? Andi, what's you nearest guess?
Matthias
 5/1/2018 2:08:53 AM
It's simply a brandnew type of drone for intergalactical exploration, developed by the hyper-intelligent cacklers, a race from henhouse-cluster, edge right below. Beautiful iron, Andy, lapidary formed and with an attractive surface-mix of black-bluish crust and velvet-brown patina - exactly that what we are longing for. Good sized, designated to rest in one's hand. Of course it is tempting to know more about the enterior. But it is possible to resist the temptation, too. Thanks for sharing.
 

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