Lunar Meteorite

Northwest Africa 2998 & 7262
(possibly paired stones)



NWA 2998 is an oriented stone with a nearly complete fusion crust.
(photo credit: anonymous finder)

Two views of Northwest Africa 7262
(photo credit: A. Aaronson)


Thin section of NWA 7262. Field of view: 2.5 cm wide. Note the vesicular fusion crust on the lower left. Click on image for enlargement (big).
(photo credit: Randy Korotev)


Lab samples of NWA 2998

(photo credit: Randy Korotev)


from The Meteoritical Bulletin, No. 91, Meteoritics & Planetary Science 42, A413-A466 (2007)

Northwest Africa 2998

Find: 2006
Mass: 163 g

Achondrite (lunar, anorthositic breccia)

History: Found in the southern Algerian desert in May 2006. Purchased by A. Aaronson in Morocco, June 2006.

Physical characteristics: Medium brown, oriented, nearly complete 163 g stone. The fusion crust is fresh, with very prominent flow lines.

Petrography: (T. Bunch and J. Wittke, NAU) Breccia-in-breccia structure; breccia clasts are granulated or cataclastized with fine-grained to melt matrix. Vesiculated shock-melt veins and isolated glass clumps are common. Consists of partially maskelynitized plagioclase fragments (47 vol%), shock-melt anorthositic clasts (38 vol%), dark glasses (7 vol%), norites and troctolites (6 vol%), and olivine and pyroxene fragments (2 vol%). No mare components were observed.

Mineral compositions and geochemistry: Plagioclase (An93.6–99; FeO = 0.15–0.35 wt%), olivine (Fa21.7–34.6; FeO/ MnO = 79–87), orthopyroxene (Fs22.5–29.5Wo2.1–3.2; FeO/MnO = 53–59), pigeonite (Fs49.3Wo5.2; FeO/MnO = 53), augite exsolution lamellae in pigeonite (Fs27.4Wo43.1), ferroaugite (Fs45.8Wo38.9; FeO/MnO = 28). Bulk composition: (R. Korotev, WUSL, INAA of 224 mg sample) FeO = 2.7 wt%; Ni =60, Sm = 0.42, and Th = 0.13 (all ppm).

Classification: Achondrite (lunar, anorthositic breccia).

Type specimen:
A total of 20.4 g and one thin section are on deposit at NAU. The main mass holder is anonymous.

* The purchaser says that it is from Morocco.  


from The Meteoritical Bulletin, No. 101

Northwest Africa 7262

(Northwest Africa)
Purchased: 2012 Feb
Mass: 413 g

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased by Adam Aaronson in Temara, Morocco, in 2012 February.

Physical characteristics: A single stone (413 g) broken naturally into five pieces that fit together. Abundant white clasts visible through the pale, translucent fusion crust.

Petrography: (A. Irving and S. Kuehner, UWS; A. Greshake, MNB). Felsic fragmental breccia composed of feldspar-rich clasts in a very fine grained matrix. Minerals are olivine, orthopyroxene, pigeonite, subcalcic augite, anorthite, silica, fayalite, Ti-chromite, troilite and minor kamacite (as irregular scraps).

Geochemistry: Olivine (Fa6.8-52.6, FeO/MnO = 72-127), orthopyroxene (Fs28.6-45.6Wo3.8-4.2, FeO/MnO = 53-64), subcalcic augite (Fs25.4Wo34.3, FeO/MnO = 50), augite (Fs17.1Wo41.6, FeO/MnO = 65), plagioclase (An93.3-96.3Or0.1). Bulk composition (R. Korotev, WUSL): mean values from INAA of subsamples are 3.1 wt.% FeO, 5.7 ppm Sc, 70 ppm Ni, 1.3 ppm La, 0.58 ppm Sm, 0.77 ppm Eu, 0.47 ppm Yb, 0.22 ppm Th.

Classification: Lunar (feldspathic breccia). This specimen is very similar in appearance, mineralogy and bulk composition to NWA 2998, and it is likely that these are paired.

Specimens: A total of 20.3 g of material and one polished thin section are on deposit at UWB. The remaining material is held by Aaronson.


Randy Says…

Northwest Africa NWA 2998 and 7262 may not be terrestrially paired as the owner of both stones believes that they were found in different places. But my analyses of subsamples of the two stones overlap for all elements measured, and the stones look rather similar to each other.  It's one of the most feldspathic of lunar meteorites. Together, the two stones are very similar in composition to Dar al Gani 400/1058.


More Information

Meteoritical Bulletin Database

NWA 2998 | 7262


Joy K. H., Burgess R., Ruzie L, and Clay P. L. (2014) Composition, age and regolith history of feldspathic lunar meteorites (abstract). 77th Annual Meeting of the Meteoritical Society, abstract no. 5345.

Korotev R. L and Irving A. J. (2013) Keeping up with the lunar meteorites - 2013 (abstract). In 44th Lunar and Planetary Science Conference, abstract no. 1216.

Korotev R. L. and Zeigler R. A. (2007) Keeping up with the lunar meteorites (abstract). In Lunar and Planetary Science XXXVIII, abstract no. 1340, Lunar and Planetary Institute.

Korotev R. L., Irving A. J., and Bunch T. E. (2008) Keeping up with the lunar meteorites – 2008 (abstract). In Lunar and Planetary Science XXXIX, abstract no. 1209, 39th Lunar and Planetary Science Conference.

Korotev R. L., Jolliff B. L., and Zeigler R. A. (2010) On the origin of the moon’s feldspathic highlands, pure anorthosite, and the feldspathic lunar meteorites (abstract). In Lunar and Planetary Science XLI, abstract no. 1440, 41st Lunar and Planetary Science Conference.



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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.


Last revised: 14-Oct-2015