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Lunar Meteorite

Northwest Africa 11061

northwestern Africa

 

 

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Northwest Africa 11061
(photo credit: Darryl Pitt)

 

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A clast of ferroan anorthosite in NWA 11061
(photo credit: Darryl Pitt)

 

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Lab sample of NWA 11061
(photo credit: Randy Korotev)

 

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The ferroan anorthosite clast up close (0.5% FeO)
(photo credit: Randy Korotev)

 

 

from The Meteoritical Bulletin, No. 106

Northwest Africa 11061

Northwestern Africa
Purchased: 2016 November
Mass: 1815 g

Lunar meteorite (feldspathic breccia)

History: Purportedly found near the Algeria/Mali border in October 2016, and purchased by Darryl Pitt in November 2016 from a dealer in Mauritania.

Physical characteristics: A single stone (1040 g) lacking fusion crust. The fresh interior exhibits rounded, whitish anorthositic clasts (up to 1.8 cm across) and crystalline debris set in a medium-gray matrix containing obvious small vesicles.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of angular mineral clasts of anorthite, exsolved pigeonite, olivine, orthopyroxene, pigeonite, ilmenite, Ti-chromite, Ti-free chromite, troilite and rare zircon, plus some lithic anorthosite clasts, in a finer grained, partly vesicular matrix of the same minerals.

Geochemistry: Olivine (Fa19.4-52.9, FeO/MnO = 68-91, N = 5), orthopyroxene (Fs23.6Wo3.5, FeO/MnO = 53), pigeonite (Fs36.7Wo15.4, FeO/MnO = 53), low-Ca pyroxene host in exsolved pigeonite (Fs44.5Wo7.1, FeO/MnO = 53), high-Ca pyroxene host in exsolved pigeonite (Fs24.6Wo36.4, FeO/MnO = 52), plagioclase (An97.1-97.6Or0.1, N = 2). Bulk composition (R. Korotev, WUSL) INAA of subsamples gave the following mean abundances (in wt.%) FeO 3.4, Na2O 0.32; (in ppm) Sc 6.6, Ni 100, La 1.8, Sm 0.79, Eu 0.78, Yb 0.64, Lu 0.09, Hf 0.58, Th 0.30. Magnetic susceptibility log χ (× 10-9 m3/kg) = 2.61.

Geochemistry: Olivine (Fa35.1; Fa87.0-89.9; FeO/MnO = 91-93, N = 3), pigeonite (Fs41.0Wo7.3; Fs58.3Wo21.3; Fs21.8Wo24.8; FeO/MnO =57-67, N = 3), augite (Fs14.5Wo40.2, FeO/MnO = 45).

Classification: Lunar (feldspathic regolith breccia).

Specimens: 20.7 g including a polished endcut at UWB; remainder with DPitt.

 

Randy Says…

This appears to be a new one.

 

More Information

Meteoritical Bulletin Database

NWA 11061

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 you've found until you read this and this.


e-mail
korotev@wustl.edu

Last revised: 09-March-2017