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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

 

 
San Juan de Allende *   contributed by Steve Brittenham, IMCA 2184   MetBul Link


Roll Overs:     #1   #2   #3   #4   #5   #6   #7   #8   #9   #10    


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View all entries for   Meteorite (1)   Contributor (82)


Copyright (c) Steve Brittenham.
  L3

TKW 200 grams. Fall not observed. Found August 1955, Chihuahua, Mexico.


 


Steve writes:

* * * Asterisk * * * most likely San Juan de Allende but not actually classified.

Yesterday’s MPOD described San Juan de Allende – an L3 stone meteorite found in the Allende carbonaceous chondrite strewn field. In that post, I mentioned how it and another stone meteorite were among traditional Allende CV3s in a large bag of stones purchased by Edwin Thompson from Ruben Jurado a quarter of a century ago. I further described how the pair was sent to UNM for classification, and also the circumstances by which they were "lost" until earlier this year, when both were returned to Edwin (Photo 1 shows a UNM note that was included with this smaller stone’s return).

Only part of San Juan de Allende was sent to UNM, leaving additional material to be available for its subsequent classification by Cascadia Meteorite Labs. But this second 102.4 gram stone was sent in its entirety and consequently was never classified.

Photos 2 and 3 show the leading edge of this oriented stone; Photo 4 displays the trailing side and some suggestion of a rollover lip. The broken edge in Photo 5 exhibits chondrules much like San Juan de Allende (Photo 6 shows a smaller broken window on a different side of the meteorite). Photos 7 and 8 offer alternate views of a side with partial fusion crust and additional indications of a possible rollover lip (the second of the pair also includes a 1 cm cube for size reference).

And because no post from me would be complete without at least one 3D image, Photos 9 and 10 provide, respectively, magnified crossed-eyes and red-cyan anaglyph 3D images of a part of the broken surface showing some complete chondrules and the thin edge of fusion crust on its trailing side.



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I cannot fuse the stereo-pair images as presented. They are too large for my aged eyeballs to bring together. If you have the same problem, try this:

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Photo 1

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Photo 3

Photo 4

Photo 5

Photo 6

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Photo 8

Photo 9

Photo 10

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

 


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 12/7/2021 12:35:21 AM
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