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Lunar Meteorite

Northwest Africa 11457

Algeria

 

Photomicrograph of a thin section of Northwest Africa 11457

(Image credit: Ann-Kathrin Kraemer and Addi Bischoff)

 

 

from The Meteoritical Bulletin, No. 106

 

Northwest Africa 11457

 

Algeria

Found: 2016

Mass: 273 g

 

Lunar meteorite (feldspathic breccia)

 

History: Seven pieces with a total mass of 273 g were purchased form a Moroccan dealer in Ouazazate, Morocco May 2016. The sample may have been found in Algeria and brought by nomads to a dealer in Zwirate in the north of Mauritania.

 

Physical characteristics: The susceptibility values (J. Gattacceca, CEREGE) for the four largest samples are as follows: log χ (× 10-9 m3/kg) = 3.31 (117.7g sample); log χ (× 10-9 m3/kg) = 3.56 (88.64 g sample); log χ (× 10-9 m3/kg) = 3.25 (39.91 g sample); log χ (× 10-9 m3/kg) = 3.25 (15.34 g sample).

 

Petrography: (A.-K. Kraemer and A. Bischoff, IfP) Breccia composed of angular anorthite-rich lithic and mineral fragments embedded in a fine-grained clastic matrix. Observed minerals include anorthite, olivine, low-Ca pyroxene, Ca-rich pyroxene, silica polymorph, Al-Ti-chromite, kamacite, ilmenite, troilite, pendlandite and schreibersite. Calcite veins indicate moderate degree of weathering.

 

Geochemistry: Mineral compositions and geochemistry: Olivine (mean: Fa48.2, Fe/Mn = 101; N = 199), low-Ca pyroxene (mean Fs35.4Wo12.4, Fe/Mn = 62, 22,9 N = 199), Ca-rich pyroxene (mean: Fs30.7Wo35.2; Fe/Mn = 69; N = 73), anorthite (mean An92.7Or0.3, N = 201).

 

Classification: Lunar (feldspathic breccia).

 

Specimens: 22.9 g and thin sections. Main mass with Ben Hoefnagels.

 

Randy Says…

 

I don’t have a sample of this one. An92.7 is unusually low for a feldspathic breccia

 

More Information

Meteoritical Bulletin Database

NWA 11457 

References

 

 

 

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Prepared by: Randy L. Korotev

Department of Earth and Planetary Sciences
Washington University in St. Louis

Please don’t contact me about the meteorite you think that
you’ve found until you read this and this.

 

e-mailkorotev@wustl.edu

Last revised: 18 December 2018