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Zerhamra   contributed by jnmczurich, IMCA 2391   MetBul Link


Roll Overs:     #1   #2   #3   #4    


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View all entries for   Meteorite (1)   jnmczurich (132)


121.5 grams. 81 x 59 x 5 mm.   Iron, IIIAB-an

TKW 630 kg. Fall not observed. Found 1961, Bechar, Algeria.



Photo 4 is the main mass and is courtesy of wikimedia commons

   


jnmczurich writes:
Zerhamra is a cosmic reheated (annealed = no Neumann lines) very fresh iron meteorite. It is a slightly chemical anomalous member of the IIIAB iron group (IIIA-an) with straight long kamacite lamellae (L/W is about 25). It is a medium octahedrite (Om) with a bandwidth of 1.10±0.15 mm. Grain size of the recrystallized kamacite is 0.1 to 0.4 mm (average size 0.25 mm). Plessite fields and taenite are still visible.

Ni content is 7.6 to 8.0%; P content is 0.10 to 0.14%

The close-up pictures are about 8x6 mm.

Pretty interesting is the thick alpha-2 rim, the very fine grained reheated zone due to the atmospheric flight. Zerhamra is rarely found in collections.

Collector trade: 1992. Before that it came from the Paris Museum Collection as a block sample.
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#1

#2

#3

#4
Found at the arrow (green or red) on the map below
 


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This Month

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Gregor Hoeher
 3/12/2018 12:32:17 PM		 Very nice slice & meteorite. Great pattern. Have never heard of this meteorite. Thanks for sharing.
Andi Koppelt
 3/12/2018 6:08:19 AM		 Thanks for introducing another rare iron, J*rgen. Never saw this before.
John Divelbiss
 3/12/2018 5:51:39 AM		 the annealed texture of the kamacite provides for a mottled look. thus the grainy-sandy textured look.
Juergen / jnmczurich
 3/12/2018 5:26:01 AM		 Hi Bernd Good question. The slice is very nice polished and etched, so the "sand" effect is probably an effect of the reflecting spotlights in the room, where I took the pictures. I will improve the light technique with my next MPOD irons, coming someday.
Bernd Pauli
 3/12/2018 5:04:30 AM		 Thanks for sharing with us, Juergen! Why does this slab look as if it was covered with sand?
 

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