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Lunar Meteorite

Northwest Africa NWA 10404

northwestern Africa

 

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Two views of unnamed 91
(photo credit: by Mohamed Aid)

 

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An intriguing view of NWA 10404, with a clast of green impact glass exposed. On the Moon, glass formed from feldspathic rocks (low iron) is often green because the concentration of chromium is high even in feldspathic rocks (several hundred parts-per-million).  On Earth, chromium (Cr) is added to glass to make it green.
(photo credit: Darryl Pitt)

 

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A large sawn face of NWA 10404. Click on image for enlargement.
(photo credit: Randy Korotev)

 

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Two sides of a slice of unnamed 91. The vesicularity is evident here. Click on image for enlargement.
(photo credit: Randy Korotev)

 

from The Meteoritical Bulletin, No. 104

Northwest Africa 10404

(Northwestern Africa)
Purchased: 2015 May, Ouarzazate, Morocco
Mass: 229 g, 1 piece

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased by Darryl Pitt in May 2015 from a dealer in Ouarzazate, Morocco.

Physical characteristics: A single stone (229 g) lacking fusion crust. Interior slices exhibit angular mineral clasts plus rounded colorless, brownish and greenish glassy objects in gray, partly vesicular matrix

Petrography: (A. Irving and S. Kuehner, UWS) Vitric fragmental breccia composed of angular to rounded lithic clasts plus mineral clasts of anorthite, olivine, pigeonite, orthopyroxene, subcalcic augite, augite and rare Ti-chromite, troilite and taenite in a partly vitreous matrix. Some lithic clasts are fine grained, plagioclase-phyric crystalline lithologies, but many consist of partly-devitifried glass with bulk compositions intermediate between those of anorthite, olivine and low-Ca pyroxene. The latter consist of isotropic cores (colorless to pale brown in thin section) mantled by aggregates rich in polycrystalline, spherulitic birefringent crystallites within zones parallel to clast margins and constituting ~50% of clast volumes.

Geochemistry: Olivine (Fa26.4; Fa47.2, FeO/MnO = 77-84, N = 2), orthopyroxene (Fs37.6Wo3.2, FeO/MnO = 64), pigeonite (Fs21.1-25.9Wo15.5-11.3, FeO/MnO = 59-60, N = 2), subcalcic augite (Fs21.9Wo32.2, FeO/MnO = 51), augite (Fs20.0Wo37.9, FeO/MnO = 46), plagioclase (An96.1-97.0Or0.0, N = 3). Bulk composition (R. Korotev, WUSL) INAA of subsamples gave the following mean abundances (in wt.%) FeO 3.8, Na2O 0.36; (in ppm) Sc 6.8, La 4.2, Sm 2.0, Eu 0.83, Yb 1.5, Lu 0.21, Th 0.74.

Classification: Lunar (feldspathic vitric regolithic breccia).

Specimens: 20.61 g including one polished thin section at UWB; main mass with DPitt.

 

Randy Says…

It's a unique and unusually glassy and vesicular. 

 

More Information

Meteoritical Bulletin Database

NWA 10404

References

Korotev R. L. and Irving A. J. (2016) Not quite keeping up with the lunar meteorites – 2016. 47th Lunar and Planetary Science Conference, abstract no. 1358.

Kuehner S. M., Wittmann A., Korotev R. L., Carpenter P., Macke R. J., Britt D. T., Irving A. J., and Pitt D. (2016) Petrologic, chemical and physical characterization of unique lunar vitric regolith breccia Northwest Africa 10404. 47th Lunar and Planetary Science Conference, abstract no. 2246.

Will P., Maden C., and Busemann H. (2016) Noble gases in recently found hot and cold desert lunar meteorites (abstract). 79th Annual Meeting of the Meteoritical Society, abstract no. 6548.

Wittmann A., Korotev R. L., Kuehner S. M., and Irving A. J. (2016) The origin and processing of magnesian glass in lunar meteorite Northwest Africa 10404 (abstract). 79th Annual Meeting of the Meteoritical Society, abstract no. 6025.

 

 

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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.


e-mail
korotev@wustl.edu

Last revised: 28-June-2016