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Lunar Meteorite

Northwest Africa 11182

northwestern Africa

 

A slice of Northwest Africa 11182.  Click on image for enlargement.
(photo credit: Ruben Garcia)

 

lm_nwa11182_3671_0.68g_m.jpg

lm_nwa11182_3669_0.68g_m.jpg

Two sides of another slice of Northwest Africa 11182.  Click on image for enlargement. Thanks to Ruben Garcia for the sample.
(photo credit: Randy Korotev)

 

Lab sample of Northwest Africa 11182. Thanks to Carl Agee for the sample.
(photo credit: Randy Korotev)

 

from The Meteoritical Bulletin, No. 106

 

Northwest Africa 11182

 

(Northwestern Africa)

Purchased: 2017

Mass: 60 g

 

Lunar Meteorite (feldspathic breccia)

 

History: Purchased by Ruben Garcia from Said Haddany in Tucson, 2017.

 

Physical characteristics: Single stone, no fusion crust. A saw cut reveals a fragmental breccia with numerous white feldspathic clasts and fine-grained lithic fragments, set in a dark-gray ground mass.

 

Petrography: (C. Agee, UNM) This meteorite consists of primarily feldspathic clasts, microgabbro clasts, and shock melt, some containing vesicles.

 

Geochemistry: (C. Agee and B. Ha, UNM) pigeonite Fs28.9±1.6Wo11.8±7.0, Fe/Mn=56±3, n=2; high Ca pyroxene Fs22.7±11.7Wo28.6±5.9, Fe/Mn=52±2, n=2; two olivine grains were found: Fa16.9 and Fa34.6 with Fe/Mn=91 and 98 respectively; plagioclase An92.9±3.2Ab6.8±3.2Or0.3±0.1, n=4.

 

Classification: Lunar feldspathic breccia.

 

Specimens: 12 g plus a probe mount on deposit at UNM, Ruben Garcia holds the main mass.

         

Randy Says…

Rare earth element (REE) concentrations in 8 subsamples of NWA 11182. This is 1 of only 3 lunar meteorites that I know to have a negative cerium (Ce) anomaly (see also NWA 11223 and Tichiya). Curiously, the meteorite does not appear to be weathered more than most NWA lunar meteorites. Pr and Nd values calculated by interpolation between La and Sm. Dy, Ho, Er, and Tm values interpolated between Tb and Yb. The Gd value is the mean of the La-Sm extrapolation, the Sm-Tb interpolation, and the Yb-Tb extrapolation.

 

More Information

Meteoritical Bulletin Database

NWA 11182 

References

 

Boyle S., Gross J., and Prissel T. C. (2018) Understanding the magnesium-suite lithology and lunar highlands terrain through a detailed investigation of lunar meteorites Northwest Africa (NWA) 10291 and 11182. 49th Lunar and Planetary Science Conference, abstract no. 2346.

 

 

 

 

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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 that
you’ve found until you read this and this.

 

e-mailkorotev@wustl.edu

Last revised: 13 February 2018