Lunar Meteorite

Northwest Africa 12839

northwestern Africa

 

from The Meteoritical Bulletin, No. 108

 

Northwest Africa 12839

 

(Northwest Africa)

Purchase: 2019 June

Mass: 68.75 g

 

Lunar (diabase)

 

History: Purchased by Ben Hoefnagels in June 2019 from a dealer in Agadir, Morocco.

 

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Diabasic texture (mean grainsize 0.5 mm). Composed primarily of zoned clinopyroxene and maskelynite with accessory blade-like ilmenite, very sparse zoned olivine (~3 vol.%), Cr-Ti oxides, baddeleyite, probable zirconolite, troilite, merrillite, silica polymorph, fayalite and hedenbergite. Dark shock glass is present in pockets (vesicular) and as cross-cutting veinlets.

 

Geochemistry: Subcalcic augite (core Fs28.8Wo26.3, FeO/MnO = 50; rim Fs72.4Wo23.6, FeO/MnO = 77), augite (core Fs21.2Wo38.7, FeO/MnO = 47; rim Fs81.5Wo17.7, FeO/MnO =81), pigeonite (core Fs41.8Wo12.9,FeO/MnO = 65; rim Fs69.8Wo22.4, FeO/MnO = 77), olivine cores (Fa37.6-39.5, FeO/MnO = 92-94, N = 3), olivine rims (Fa54.1-68.2, FeO/MnO = 93-110, N = 3), fayalite (Fa99.2, FeO/MnO = 95), maskelynite (An87.5-88.2Or0.3, N = 2).

  

Classification: Lunar (mare diabase, clinopyroxene-rich, olivine-poor).

 

Specimens: 14.1 g including one polished thin section at UWB; remainder with Mr. B. Hoefnagels.

 

Randy Says…

I have not studied this one. I assume that it is unpaired with other basaltic lunar meteorites from the description. We need a whole-rock chemical analysis.

 

More Information

Meteoritical Bulletin Database

NWA 12839

References

 

Back to: Lunar Meteorites | List of Lunar Meteorites | Top of Page

 

 

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 January 2020