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NWA 10327   contributed by Sean Murray, IMCA 3138   MetBul Link


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  Eucrite-melt breccia

TKW 3.15 kg. Fall not observed. Found 2015 in Morocco.

Sean writes:
Achondrite (Eucrite, melt breccia) fragmental, equilibrated basaltic eucrite grains set in a eucritic melt rock.

Beautifully colored eucrute melt breccia from a single stone with weathered fusion-crusted exterior. Cut face shows a breccia of light-gray and white clasts set in a matrix of dark impact melt, some of it vesicular. A few small caliche-filled cracks and veins are present in the outer rind of the stone, however they do not penetrate throughout the mass.

Microprobe examination of a polished mount shows many fragmental plagioclase and pyroxene grains, and a few microgabbro clasts, bounded by melt veins and pools. Some melt zones transition into a cataclastic groundmass of very fine-grained plagioclase and pyroxene. Most pyroxenes possess exsolution lamellae. Accessory troilite, chromite, ilmenite and silica. Calcite and barite weathering products detected.


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2 pictures in the Queue
Chris
 5/31/2016 7:48:37 PM
Very nice!
Graham
 5/31/2016 7:08:10 AM
Beautiful specimen!
Anne Black
 5/31/2016 2:09:44 AM
Could be interesting in a thin-section. But the shock value must be a 5.
Jarkko Kettunen
 5/31/2016 2:05:27 AM
Looks great!
 

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