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MISSING: 9.04 kilogram Sikhote-Alin shrapnel individual   More Info


 
NWA 3189   contributed by Solar Anamnesis   MetBul Link


Roll Overs:     #1   #2   #3    


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View all entries for   Meteorite (2)   Contributor (35)


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What is a thin section?       What do all the colors mean?    
Thin section between crossed polarizers.   LL3

TKW unknown. Fall not observed. Name assigned 1 March 2005.

Don't miss the zoomable hi-res picture on Krpano.

 


Solar writes:
Good looking thin section of the NWA 3189 meteorite in cross-polarized light. Lots of chondrules with several distinct barred ones.

The MPOD web master writes:
Photo 2 is a crop from the Krpano site and looks to me to be a shatter cone. Is that even possible?

Photo 3 is a collection of crops, each showing an annular structure (red arrows). They caught my eye because they look perfectly circular, are hollow, and exist at different scales, plus I've never noticed this in other thin sections.


  Click to view larger photos     Photo 1     Photo 2     Photo 3


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Anne Black
 9/23/2018 12:56:51 PM
Great pictures Solar, and Thank you Roger for an excellent and thorough explanation. Yes making thin-sections is an art, and micro-bubbles can happen, but I am so glad this is not one of my thin-sections! ;-)
Jesper Gr*nne
 9/23/2018 12:29:13 PM
Lovely photos * thanks * also for the comments :-)
Roger Warin
 9/23/2018 8:42:13 AM
Photo 2 is a radial pyroxene chondrule. It illustrates the crystallization of pyroxene from a point, resulting in a fan-like texture. It's certainly not a shattercone which is an impactite. Photo 3 (regarding the annular structures, red arrows). These are imperfections in the TS. Air microbubbles are inserted below the cover. The microbubble is transparent and does not modify the cross-polarization. The circles are due to the "vertical" walls of the bubble where refraction phenomena occur, thereby deflacting the light beam. I personally did observe the same phenomena on some selected TS slides Roger
David Allepuz
 9/23/2018 7:07:23 AM
Photo 3 show bubbles on glue between sample and support glass. But that LL3 meteorite is Amazing. Thanks for showing us.
Bernd Pauli
 9/23/2018 5:28:22 AM
Photo 2 shows a perfect radial pyroxene chondrule. Beautiful!
 

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