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Lunar Meteorite

Northwest Africa 10253 & 10258
(paired stones)

northwestern Africa

 

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One of the NWA 10253 stones
(photo credit: Darryl Pitt)

 

A slice of one of the NWA 10253 stones
(photo credit: Steve Arnold)

 

Lab sample of NWA 10253. Click on image for enlargement. Thanks to Carl Agee for the sample.
(photo credit: Randy Korotev)

 

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Two sides of a slice of NWA 10258. Thanks to Steve Arnold for the sample.
(photo credit: Randy Korotev)

 

Another lab sample of NWA 10258. Thanks to Carl Agee for the sample.
(photo credit: Randy Korotev)

 

from The Meteoritical Bulletin, No. 104

Northwest Africa 10253

Northwestern Africa
Purchased: 2015
Mass: 6674.1 g

Lunar meteorite

History: Purchased by Darryl Pitt from a Moroccan meteorite dealer, reportedly found in Mauritania near the Algerian border.

Physical characteristics: Weathered irregular exterior. Saw cuts reveal a fragmental breccia with numerous feldspathic and mafic clasts set in a gray groundmass.

Petrography: (C. Agee, UNM) This meteorite is a very heterogeneous polymict breccia consisting of numerous microgabbro clasts, shock melt pools and veins, fragmental plagioclase, pyroxene, and olivine. Accessory Fe-oxide, troilite, Ti-chromite, ilmenite, and silica were observed. Thin calcite weathering veins are present.

Geochemistry: (C. Agee and N. Muttik, UNM) olivine Fa38.32.7, Fe/Mn=1025, n=14; pigeonite Fs39.914.7Wo12.75.5, Fe/Mn=639, n=14; augite Fs42.714.2Wo27.07.9, Fe/Mn=6911, n=10; anorthite plagioclase An95.31.8Ab4.41.7Or0.20.1, n=6; labradorite plagioclase An55.5Ab43.2Or1.3, n=1; Shock melt (10 m defocused electron beam, proxy for bulk meteorite composition): SiO2=46.11.6, TiO2=0.630.46, Al2O3=23.14.8, Cr2O3=0.160.09, MgO=6.83.5, FeO=7.13.2, MnO=0.090.05, CaO=14.02.0, NiO=0.030.03, Na2O=0.550.21, K2O=0.120.08 (all wt%), Fe/Mn=8123, Mg#=618, MgO+FeO=13.96.0 (wt%), n=31.

Classification: Lunar feldspathic breccia

Specimens: 32.5 g including a probe mount on deposit at UNM, DPitt holds the main mass.

 

from The Meteoritical Bulletin, No. 104

Northwest Africa 10258

Northwestern Africa
Purchased: 2015
Mass: 58 g

Lunar meteorite

History: Purchased by Steve Arnold from Morocco, 2015.

Physical characteristics: Single stone, dark irregular surface, no fusion crust. A saw cut reveals numerous light-colored clasts set in a dark groundmass.

Petrography: (C. Agee, UNM) This meteorite is mixture of a fine-grained cataclastic domains, fragmental plagioclase and pyroxene crystals, fragmental anorthosite clasts, and shock melt veins; some of the veins have ~200 m-size vesicles. Accessory troilite, ilmenite, and chromite were observed.

Geochemistry: (C. Agee and N. Muttik, UNM) olivine Fa37.91.3, Fe/Mn=987, n=6; pigeonite Fs38.913.7Wo11.56.0, Fe/Mn=6210, n=5; augite Fs22.7Wo40.0, Fe/Mn=575, n=1; plagioclase An96.20.5, n=3; Shock melt (20 m defocused electron beam, proxy for bulk meteorite composition): SiO2=46.31.8, TiO2=0.440.18, Al2O3=26.95.3, Cr2O3=0.0140.10, MgO=5.62.7, FeO=6.43.2, MnO=0.080.05, CaO=14.42.0, NiO=0.030.03, Na2O=0.540.24, K2O=0.140.07 (all wt%), MgO+FeO=12.15.5 (wt%), n=11.

Classification: Lunar (feldspathic breccia)

Specimens: 11.7 g including a probe mount on deposit at UNM, Steve Arnold holds the main mass.

 

Randy Says

NWA 10253 was found as several stones, and NWA 10258 was probably one that got away.

 

More Information

Meteoritical Bulletin Database

NWA 10253 | 10258

References

 

 

 

 

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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: 07-July-2017