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Rodeo   contributed by jnmczurich, IMCA 2391   MetBul Link


Roll Overs:     #1   #2   #3   #4   #5    


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View all entries for   Meteorite (2)   Contributor (110)


64.9 grams. 61 x 53 x 3 mm.   Iron, IID

TKW 44 kg. Fall not observed. Found 1852, Durango, Mexico.



   


jnmczurich writes:
Rodeo is a medium octahedrite (Om) with bandwidth 0.65 ± 0.10 mm. and an artificially created α2 structure. Found about 1852, the iron mass served for many years as an anvil at a forge before it was acquired about 1904 by the Field Museum Chicago where it was fully described with photographs of the exterior and of an etched slice by Farrington (1905).

This small collection sample has an old and unchanged etch. The Widmanstätten pattern is a bit deformed by the use of the meteorite as an anvil. Especially see at the left upper corner the curved kamacite bars in both overview pictures. The cracks in the slice are also the result of artificial reheating (up to 800-900°C = no more Neumann bands) and hammering.

Photos:
1 - bright taenite

2 - dark kamacite

3 - deformed Widmanstätten pattern due to artificial reheating and hammering (about 6 x 8 mm)

4 - former martensitic plessite fields (dark) inbedded between crossing kamacite bars (about 6 x 8 mm)

5 - degenerated comb plessite fields and some plastic deformation of the Widmannstätten structure (about 6 x 8 mm)

All three detail photographs (3-5) show the artificially created α2 structure (small flakes in the kamacite bars).

Museum trade: 1990


  Click to view larger photos     Photo 1     Photo 2     Photo 3     Photo 4     Photo 5
 


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Moldavite
Matthias Baermann

This Month

Anne Black
 3/19/2018 4:09:49 PM
Great and rare meteorite!
Bernd Pauli
 3/19/2018 11:22:24 AM
love picture #1 ... great etch pattern!
John Divelbiss
 3/19/2018 8:32:02 AM
love picture #4...great screensaver
 

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