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Lunar Meteorite

Northwest Africa 10141 & 10415
(presumed paired stones)

northwestern Africa

 

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Two sawn faces of NWA 10141
(photo credit: Matt Morgan)

 

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Northwest Africa 10415
(photo credit: Aras Jonikas)

 

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Polished faces of two slices NWA 10415
(photo credit: Aras Jonikas)

 

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Lab sample of NWA 10141 (unpolished). Click on image for enlargement. Thanks to Matt Morgan for the sample.
(photo credit: Randy Korotev)

 

 

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Lab sample of NWA 10415 (unpolished side on top, polished on bottom). Click on image for enlargement. Thanks to Aras Jonikas for the sample.
(photo credit: Randy Korotev)

 

from The Meteoritical Bulletin, no. 104

Northwest Africa 10141

Northwestern Africa
Purchased: 2015 Jan
Mass: 39 g

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased by Matt Morgan and Lee Morgan in Morocco in January 2015.

Physical characteristics: Single stone. A saw cut reveals a feldspathic breccia with dark-gray shock melt veins.

Petrography: (C. Agee, UNM) This meteorite is mixture of a fine-grained cataclastic domains, large fragmental plagioclase crystals, and shock melt veins; some of the veins have ~100 μm-size vesicles. Accessory troilite, ilmenite, and chromite were observed.

Geochemistry: (C. Agee and N. Muttik, UNM) olivine Fa38.8±1.4, Fe/Mn=102±7, n=12; pigeonite Fs34.9±3.6Wo7.2±3.5, Fe/Mn=62±4, n=5; augite Fs25.8±5.3Wo32.1±0.9, Fe/Mn=55±5, n=5; plagioclase An96.7±0.4Ab3.1±0.4Or0.2±0.0, n=6; Shock melt (20 μm defocused electron beam, proxy for bulk meteorite composition): SiO2=44.1±0.4, TiO2=0.18±0.04, Al2O3=31.4±1.0, Cr2O3=0.06±0.02, MgO=3.3±0.7, FeO=3.4±0.6, MnO=0.04±0.02, CaO=17.4±0.5, NiO=0.02±0.02, Na2O=0.33±0.03, K2O=0.05±0.01 (all wt%), Fe/Mn=76±17, Mg#=63±2, MgO+FeO=6.7±1.3 (wt%), n=10.

Classification: Lunar (feldspathic breccia)

Specimens: 8.1 g including a probe mount on deposit at UNM, MtMorgan and Lee Morgan hold the main mass.

 

from The Meteoritical Bulletin, No. 104

Northwest Africa 10415

(Northwest Africa)
Purchased: 2015
Mass: 164 g

Classification: Lunar meteorite (feldspathic breccia)

History: Aras Jonikas purchased three stones from a Moroccan dealer in Guelmim, in August 2015.

Physical characteristics: Three identical appearing stones, 144, 15, and 5 g, with eathered exteriors. A saw cut reveals prominent light-colored feldspathic clasts, also numerous dark-gray clasts, and some shock melt veins and vesicles.

Petrography: (C. Agee, UNM) This is a fragmental, cataclastic, shock-melted lunar meteorite. Numerous feldspar grains and scattered olivines and pyroxenes are present throughout. There are shock melt domains present with vesicles. Accessory troilite, chromite, and Fe-oxides were observed.

Geochemistry: (C. Agee and N. Muttik, UNM) olivine Fa39.1±0.3, Fe/Mn=104±8, n=2; pigeonite Fs43.0±1.8Wo8.9±0.8, Fe/Mn=60±5, n=2; augite Fs33.3±12.7Wo35.0±6.5, Fe/Mn=64±5, n=2 plagioclase An96.8±0.3, n=2; Shock melt (20 μm defocused electron beam, proxy for bulk meteorite composition): SiO2=46.2±1.2, TiO2=0.17±0.13, Al2O3=31.6±4.4, Cr2O3=0.06±0.05, MgO=3.2±2.4, FeO=3.2±2.3, MnO=0.05±0.04, CaO=17.6±1.8, NiO=0.02±0.02, Na2O=0.34±0.03, K2O=0.10±0.04 (all wt%), MgO+FeO=6.5±4.7 (wt%), n=5.

Classification: Lunar (feldspathic breccia), high alumina.  

Specimens: 20.2 g including a probe mount on deposit at UNM, Aras Jonikas holds the main mass.

 

Randy Says…

Both stones have rounded clasts, which is unusual in lunar breccias. NWA 10142 may also be part of the pair group, but I have not yet analyzed it. The stones are compositionally indistinguishable from NWA 11077, but the textures are very different.

 

More Information

Meteoritical Bulletin Database

NWA  10141 | 10415 | 11077

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

 

 

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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: 18-January-2017