Lunar Meteorite: Swayyah 001

Western Sahara

Swayyah 001. Photo credit: Darryl Pitt

from The Meteoritical Bulletin, No. 108

Swayyah 001

Saguia el Hamra, Western Sahara
Purchase: 2018 November
Mass: 4602 g (6 pieces)

Lunar meteorite (gabbro)

History: Two large stones (2338 g, 1754 g) and several smaller stones were found together. One stone (177 g) was purchased by Darryl Pitt in November 2018. The 1754 g stone was purchased by Aziz Habibi in January 2019, and subsequently acquired by Darryl Pitt, who independently purchased three additional stones from several Mauritanian dealers in March 2019.

Physical characteristics: All stones lack fusion crust. Fresh interiors have a mottled dark gray appearance with a relatively coarse  grained, equigranular texture.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Coarse grained, with a gabbroic texture (mean grainsize 1.5 mm). Composed of patchily zoned clinopyroxene, maskelynite, and olivine, with accessory ilmenite, troilite, tranquillityite, Th-free monazite and rare kamacite. Minor secondary calcite and hyalophane were observed on some grain boundaries.

Geochemistry: Olivine (Fa66.6-84.2, FeO/MnO = 92-102, N = 3), pigeonite cores (Fs30.1-31.6Wo13.4-10.4, FeO/MnO = 53, N = 2), pigeonite rim (Fs44.4Wo12.5, FeO/MnO = 59), subcalcic augite rim (Fs46.9Wo32.8, FeO/MnO = 71), maskelynite (An85.1-89.1Or0.8-0.3, N = 2).

Classification: Lunar (mare gabbro).

Specimens: 46.9 g including one polished thin section and one polished endcut at UWB; remainder with DPitt.

Randy Says…

I have not studied Swayyah 001. Preliminary data show concentrations of incompatible elements to be very low.

More Information

Meteoritical Bulletin Database

Swayyah 001

References

Shi E., Carpenter P. K., Jolliff B. L., Chen J., Wang A., Tepper J. H., Irving A. J., Burney D. C., Neal C. R. (2020) Mineralogical and petrological analysis of lunar mare gabbro meteorite Swayyah 001 (abstract #2923). 50th Lunar and Planetary Science Conference.

Lunar Meteorites | List of Lunar meteorites