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Calate 005   contributed by Timur Kryachko   MetBul Link

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What is a thin section?       What do all the colors mean?    
Thin section between crossed polarizers.   H6

TKW 260 grams. Fall not observed. Found 2016, Antofagasta, Chile.


Timur writes:
The meteorite was found by Timur Kryachko a search on foot.

There is a strange crystalline crust on the surface of this oriented chondrite. At what period of the history of this meteorite could such a structure be formed?

Detailed images were obtained on a microscope using objectives 3.5x Plan and 9x Plan.

The transparent polished section was made by Timur Kryachko

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


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John Divelbiss
 1/14/2018 3:02:56 PM
Crust development is obviously a dynamic timed based process that can be "frozen" in a variety of states. Chelyabinsk, Zag, and Bilanga are three fall examples with varying crusts with some pieces having multiple types of crust. Capturing such a change like this thin section shows is awesome. The type of meteorite that is most curious to me are the Pallasites and how they crust. The next fall of one will tell me/us more about them. We are do, hopefully.
Larry Atkins
 1/14/2018 7:50:07 AM
Very nice find,thanks!
 1/14/2018 3:56:23 AM
Would be interesting to determine if this is through hot flight or if it is terrestrial weathering.
Bernd Pauli
 1/14/2018 2:48:24 AM
"At what period of the history of this meteorite could such a structure be formed?" Maybe this article in MAPS provides an answer to this question: GENGE M.J. and GRADY M. (1999) The fusion crusts of stony meteorites: implications for the atmospheric reprocessing of extraterrestrial materials (MAPS 34-3, 1999, pp. 341-356).

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