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Erg Chech 002   contributed by John Kashuba   MetBul Link


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What is a thin section?       What do all the colors mean?    
  Achondrite-ung

TKW 22.86 kg. Fall not observed. Found May 2020, Adrar, Algeria.


 


John writes:
Erg Chech 002 Ungrouped achondrite thin section. This sample is 30mm long.

Brown staining is from weathering of metal and iron sulfide. What looks like a hole in the sample is, in fact, a hole. It has a thin lining of terrestrial calcite, here in shades of brown in cross-polarized light. The groundmass is pyroxenes and feldspars of varying compositions. In XPL the feldspar is colored white through shades of gray. Megacrysts are pyroxene of varying compositions. The sections through megacrysts in this slide range from one to five millimeters across. TS1874
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Found at the arrow (green or red) on the map below
 


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Tarda
Matthias Baermann

This Month

2 pictures in the Queue
Jean-Alix Barrat
 12/10/2020 1:34:55 AM		 Superb pictures...
Twink Monrad
 12/7/2020 11:07:45 AM		 Yes lovely photos, the colors and shapes are fantastic
Bernd Pauli
 12/7/2020 4:58:12 AM		 Stunning pictures of an extraordinary achondrite. Beautiful interference colors!
Graham Ensor
 12/7/2020 4:50:38 AM		 Wonderful section John.
Mirko Graul
 12/7/2020 3:51:45 AM		 Very nice thin section John!
Anne Black
 12/7/2020 1:32:18 AM		 Thank you John! Great pictures as usual! Thank you Paul!
 

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