Lunar Meteorite: Northwest Africa 8182

northwestern Africa

Two slices of Northwest Africa 8182. Photo credit: Matt Morgan

A slice of NWA 8182 in hand. Photo credit: Matt Morgan

Two views of a lab sample of NWA 8182.  Thanks to Carl Agee for the sample. Photo credit: Randy Korotev

from The Meteoritical Bulletin, No. 103

Northwest Africa 8182 (NWA 8182)

(Northwest Africa)
Purchased: 2013
Mass: 15.6 g (1 piece)

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased by Matt Morgan in 2013, reportedly found in Algeria.

Physical characteristics: Single stone, complete, dome shaped, remnants of brown-black fusion crust. Saw cut reveals a range of clast and fragmental feldspar sizes set in dark fine grained matrix, dark gray shock melt veins throughout.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows two main types of breccia: 1) cataclastic breccia with densely packed olivine, pyroxene and plagioclase fragments and abundant vesiculated shock melt veins, 2) feldspathic breccia with primarily fragmental plagioclase set in a very fine-grained matrix. Chromite, ilmenite, zircon, phosphate, silica, and sulfide observed.

Geochemistry: C. Agee and N. Muttik, UNM). Olivines are fairly uniformly Mg-rich, olivine Fa36.5±7.1, Fe/Mn=99±10, n=31. Some plagioclase has relatively high albite content, An93.4±2.2Ab6.2±1.9Or0.4±0.3, range An89.1-96.3, n=12. This specimen appears to have three distinct clinopyroxene populations, likely representing at least three lithologic types: 1) Mg-rich clinopyroxene, Fs32.8±12.3Wo18.6±8.0, Fe/Mn=57±9, n=17; 2) Fe-rich clinopyroxene, Fs51.0±7.9Wo24.3±6.7, Fe/Mn=72±5, n=15; 3) hedenbergite, Fs53.1Wo41.6, Fe/Mn=89 + Fs-rich pigeonite, Fs81.0Wo13.0, Fe/Mn=63.

Classification: Achondrite (lunar meteorite). Feldspathic breccia.

Specimens: A total of 3.5 g, including a probe mount, is on deposit at UNM. MtMorgan holds the main mass.

Randy Says…

Northwest Africa 8182 might be another member of the NWA 2995 clan.

More Information

Meteoritical Bulletin Database

NWA 8182

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.

Korotev R. L. and Irving A. J. (2021) Lunar meteorites from northern Africa. Meteoritics & Planetary Science, 206–240. 

Lunar Meteorites | List of Lunar meteorites