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Lunar Meteorite

Rabt Sbayta 007 and & [unnamed 143]

presumed pairs

northwestern Africa

 

Rabt Sbayta 007

Photo credit: Ahmad Bouragaa

 

Interior of Rabt Sbayta 007

Photo credit: Bob Falls

 

Unnamed 143
(photo credit: Lhcen Ouabicha)

 

lm_nwa_AB#36_3149.jpg

Lab sample of Rabt Sbayta 007

Photo credit: Randy Korotev

 

Lab sample of unnamed 143 
(photo credit: Randy Korotev)

 

from The Meteoritical Bulletin, No. 106

 

Rabt Sbayta 007

 

Rio de Oro, Western Sahara

Find: 2016 August

Mass: 4432 g

 

Lunar Meteorite (feldspathic breccia)

 

History: Purportedly found NE of Bir Anzarane and purchased by Ben Hoefnagels in February 2017 from a dealer in Ouarzazate, Morocco.

 

Physical characteristics: A single elongate stone (4432 g) exhibiting whitish mineral and lithic clasts in a medium gray, very fine-grained matrix.

 

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of numerous mineral clasts plus some lithic clasts (themselves breccias) in a finer grained matrix. Minerals include anorthite, olivine, orthopyroxene, pigeonite, subcalcic augite, ilmenite, chromite, troilite and taenite.

 

Geochemistry: Olivine (Fa11.0-33.3, FeO/MnO = 71-101, N = 6), orthopyroxene (Fs18.2-19.4Wo4.6-4.1, FeO/MnO = 51-56, N = 2), pigeonite (Fs31.2Wo7.3; Fs48.6Wo5.5; FeO/MnO = 58-61), subcalcic augite (Fs51.7-59.5Wo27.0-29.3, FeO/MnO = 67-72, N = 2), plagioclase (An93.0-95.7Or1.0, N = 2). Bulk composition (R. Korotev, WUSL) INAA of subsamples gave the following mean abundances (in wt.%) FeO 4.9, Na2O 0.35; (in ppm) Sc 9.3, Ni 140, La 3.8, Sm 1.83, Eu 0.83, Yb 1.4, Lu 0.20, Hf 1.3, Th 0.63.

 

Classification: Lunar (feldspathic breccia). Although this lunar specimen was found in the same dense collection area as the Rabt Sbayta 002, Rabt Sbayta 004, Rabt Sbayta 005 and Rabt Sbayta 006 stones (but at a different location from Gataa Sfar), it differs from those stones in both petrologic and bulk compositional characteristics and thus is not paired with them (nor with Rabt Sbayta 008).

 

Specimens: 35.1 g including a polished slice at UWB; remainder with Mr. B. Hoefnagels.

 

Randy Says…

I assume pairing because they have very similar compositions.

 

More Information

Meteoritical Bulletin Database

Rabt Sbayta 007

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: 6 August 2018