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Lunar Meteorite

Northwest Africa 10509, 10798,
and several unnamed possible pairs

northwestern Africa

 

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lm_nwa10509_b.jpg

Two views of Northwest Africa 10509
(photo credit: Weibiao Hsu)

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The 82-g stone of Northwest Africa 10798. Click on image for enlargement.
(photo credit: Ben Hoefnagels)

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Lab sample of NWA 10509. Thanks to Weibiao Hsu for the sample.
(photo credit: Randy Korotev)

 

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Two views of a lab sample of Northwest Africa 10798
(photo credit: Randy Korotev)

 

from The Meteoritical Bulletin, No. 105

Northwest Africa 10509

Morocco
Find: 2014
Mass: 660 g

Classification: Lunar meteorite (anorth)

History: Purchased by Ke Zuokai in Dec. 2015 from a Moroccan dealer.

Physical characteristics: A single, irregularly shaped stone lacking fusion crust. Small white clasts are visible in a pale, finer-grained matrix.

Petrography: (W. Hsu, PMO) Fragments of plagioclase (100 μm to sub-mm) set in recrystallized matrix of fine-grained (~ 20 μm) olivine, pigeonite, and plagioclase. Olivine fragments are less abundant.

Geochemistry: Plagioclase (An86.5-98.0Ab3-13Or0-1, average: An94±4Ab5±4) (n=8), olivine (Fa22-41, FeO/MnO = 83-98), pigeonite (Fs17-59Wo3-22, FeO/MnO = 45-61).

Classification: Lunar, anorthositic breccia.

Specimens: 20 g at PMO

 

from The Meteoritical Bulletin, No. 105

Northwest Africa 10798

(Northwestern Africa)
Purchase: 2016 May, August, September
Mass: 318.6 g

Lunar meteorite (feldspathic breccia)

History: A stone was purchased by Ben Hoefnagels in May 2016 from a dealer in Ouarzazate, Morocco. Subsequently additional material was found at the same find site by the same nomad, and purchased by Ben Hoefnagels in August and September 2016.

Physical characteristics: Six larger stones (110.9, 82.1, 32.6, 30.8, 16.9, and 15.4 g) plus many smaller stones (total 29.9 g). All stones have the same distinctive appearance, lacking fusion crust but mostly coated by orange weathering products. The fresh interior exhibits whitish clasts in a light-gray matrix with visible vesicles.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia consisting of rounded to angular gabbroic anorthositic clasts, related crystalline debris, rare mare basalt clasts and very fine grained devitrified glassy clasts in a fine grained, partly vesicular matrix composed of quenchiform crystals plus glass. Minerals are anorthite, exsolved pigeonite, olivine (some forsteritic), augite, subcalcic augite, magnesian orthopyroxene, unexsolved pigeonite, ilmenite, Ti-chromite, troilite, minor primary Ba-Ca-K feldspar and secondary barite.

Geochemistry: Olivine (Fa6.0, FeO/MnO = 129; Fa53.7-60.6, FeO/MnO = 86-95; N = 4), pigeonite (Fs29.2Wo7.7, FeO/MnO = 47; Fs45.3Wo5.6, FeO/MnO = 53; N = 2), augite (Fs18.1Wo39.3, FeO/MnO = 41), orthopyroxene host (Fs59.4Wo2.1, FeO/MnO = 62), clinopyroxene exsolution lamella (Fs25.3Wo41.0, FeO/MnO = 45), plagioclase (An96.2-97.3Or0, N = 2).

Classification: Lunar (feldspathic regolith breccia).

Specimens: 20.66 g including one polished thin section at UWB; remainder with Mr. B. Hoefnagels.

 

Randy Says…

These stones are compositionally heterogeneous and may be related to some others.

 

More Information

Meteoritical Bulletin Database

NWA  10509 | 10798 |

References

Korotev R. L. and Irving A. J. (2017) Still not keeping up with the lunar meteorites – 2017. 48th Lunar and Planetary Science Conference, abstract no. 1498.

 

 

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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: 19-September-2017