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Lunar Meteorite

Northwest Africa 8222, Rabt Sbayta 002, unnamed 106, & unnamed 115
(presumed pairs)

northwestern Africa

 

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Northwest Africa 8222
(photo credit: Adam Aaronson)

 

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Sawn face of NWA 8222
(photo credit: Adam Aaronson)

 

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Ahmad Ourbaa with 6.4 kg Rabt Sbayta 002
(photo credit: ?)

 

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Two sides of unnamed 106
photo credit: ?)

 

 

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Lab samples of NWA 8222.
(photo credit: Randy Korotev)

 

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Lab samples of Rabt Sbayta 002
photo credit: Randy Korotev)

 

 

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Lab samples of unnamed 106
photo credit: Randy Korotev)

 

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Lab samples of unnamed 115
photo credit: Randy Korotev)

 

 

from The Meteoritical Bulletin, No. 103

Northwest Africa 8222

(Northwest Africa)
Purchased: 2013 Dec
Mass: 208.6 g

Classification: Lunar meteorite (feldspathic breccia)

History: The stone was purportedly found near Bir Anzarane, and was purchased in Temara, Morocco, by Adam Aaronson in December 2013.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia consisting of separated, angular mineral clasts in a finer-grained, vesicular matrix. Minerals are olivine, anorthite, exsolved pigeonite, augite, chromite, ilmenite, troilite and minor pentlandite.

Geochemistry: Olivine (Fa42.5; Fa80.6; FeO/MnO = 106-134), augite (Fs18.4Wo40.6; FeO/MnO = 54), pigeonite consists of host orthopyroxene (Fs50.1-50.9Wo2.5-5.1; FeO/MnO = 58-64) with exsolution lamellae of augite (Fs38.6Wo41.2; FeO/MnO = 67). Bulk composition (R. Korotev, WUSL) INAA of subsamples gave the following mean abundances (in wt.%) FeO 3.7, Na2O 0.37; (in ppm) Sc 7.0, Ni 90, La 1.4, Sm 0.62, Eu 0.82, Yb 0.54, Lu 0.076, Hf 0.43, Th 0.20.

Classification: Lunar (feldspathic fragmental breccia).

Specimens: A 20.1 g specimen with one polished surface is at UWB. The main mass is held by Aaronson.

 

from The Meteoritical Bulletin, No. 106

Rabt Sbayta 002

Rio de Oro, Western Sahara
Find: 2016 August
Mass: 6371.9 g

Classification: Lunar meteorite (feldspathic breccia)

History: Found by Mbarek Laghfiri and Mohamed Chikh Boy near Gataa Sfar in August 2016 and shortly thereafter. Purchased by Darryl Pitt from a Morrocan dealer in Agadir.

Physical characteristics: A single large stone (6371.9 g) lacking fusion crust but with a thin desert patina on exterior surfaces. The fresh interior exhibits pale gray to whitish clasts set in a dark gray, fine grained matrix.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of angular minerals clasts of anorthite, orthopyroxene, olivine, pigeonite, exsolved pigeonite, ilmenite, chromite, fayalite and Ti-chromite in a fine grained, partly vesicular matrix of the same minerals plus troilite and minor barite. Rare quench-textured lithic clasts are present.

Geochemistry: Olivine (Fa23.4, FeO/MnO = 64; Fa43.9, FeO/MnO = 100), orthopyroxene (Fs58.6-60.4Wo2.4-1.9, FeO/MnO = 57-72, N = 2), pigeonite (Fs44.6Wo7.9, FeO/MnO = 54; Fs27.8Wo21.3, FeO/MnO = 47), augite host in exsolved pigeonite (Fs20.9Wo38.4, FeO/MnO = 54), fayalite (Fa78.1, FeO/MnO = 81), plagioclase (An96.5-97.2Or0.2, N = 2). Bulk composition (R. Korotev, WUSL) INAA of subsamples gave the following mean abundances (in wt.%) FeO 3.5, Na2O 0.37; (in ppm) Sc 7.2, Ni 90, La 1.1, Sm 0.57, Eu 0.82, Yb 0.50, Lu 0.07, Hf 0.35, Th 0.14. Magnetic susceptibility log χ (× 10-9 m3/kg) = 2.49.

Classification: Lunar (feldspathic breccia).

Specimens: 22.9 g in the form of a single polished slice at UWB; remainder with DPitt.

 

Randy Says…

Compositionally, Northwest Africa 8222 and pairs are typical feldspathic lunar meteorite.

 

More Information

Meteoritical Bulletin Database

NWA 8222 | Rabt Sbayta 002

References

 

Korotev R. L. and Irving A. J. (2015) Keeping up with the lunar meteorites 2015. 46th Lunar and Planetary Science Conference, abstract no. 1942.

 

 

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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: 17-Febuary-2017