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2021 Fall Date Project

The MPOD Caretakers want to present meteorite falls on their fall dates. For example, Sikhote Aline on 12 February.

This Project will not dip into the MPOD archives so the Caretakers will appreciate anything you can contribute.

To reserve a date just let us know. Thank you in advance :)

Fall Calendar           Dates reserved so far

 

 
An MPOD Classic
from 19 March 2018

 
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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Le Pressoir
Anne Black

This Month

Steve Brittenham
 1/24/2021 12:29:29 PM
Its use as anvil and the artificially distorted Widmanstatten pattern is reminiscent of Elbogen! Fun history and nice piece!!
AL Mitterling
 1/24/2021 11:18:38 AM
Great meteroite, great structure, great story and wonderful presentation and history.
Mendy M Ouzillou
 1/24/2021 7:26:01 AM
Wow. I absolutely love this meteorite. Thank you for sharing!
Graham Ensor
 1/24/2021 5:39:41 AM
Wonderful outlined pattern.
 

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