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Lunar Meteorite

Northwest Africa 11962

northwestern Africa

 

from The Meteoritical Bulletin, No. 107

 

Northwest Africa 11962

 

Northwestern Africa

Purchased: 2013

Mass: 85.8 g

 

Lunar Meteorite

 

History: In 2013, the NHMV acquired a single stone weighing 85.8 g from a Moroccan dealer.

 

Physical characteristics: The specimen is a flat and rounded individual with regmaglypts exhibiting a black shiny surface with in places dull brownish areas. A cut and polished face (3 cm2) reveals two different lithologies comprising a fine-grained, dark-gray matrix with mainly submillimeter-sized light clasts and a black compact area (1 × 0.5 cm) of impact melt.

 

Petrography: (F. Brandstätter, NHMV, and A. Bechtold, UVien) Clast-rich breccia containing fine-grained lithic and mineral clasts, brownish vesicular glass, and brownish to orange glass spherules. In places, the glass exhibits a flow-banded texture with dark-grey to black schlieren. Lithic clasts include basalts, gabbroic lithologies, breccia-within-breccia clasts and granophyric intergrowths of K-feldspar and silica. Mineral clasts include ortho- and clinopyroxenes (some showing exsolution lamellae), olivine, plagioclase (mostly anorthitic), silica, spinel (chromite, ulvöspinel), ilmenite, zircon, troilite and Fe,Ni metal.

 

Geochemistry: Olivine Fa38.0±13.5 (N = 40), plagioclase An88.2±11.2Or0.6±0.5 (N = 37), orthopyroxene Fs14.3±0.4Wo1.3±1.3 (N = 63), clinopyroxene Fs30.8±9.1Wo23.4±13.5 (N = 43), K-feldspar (An4.5±1.0Or73.9±6.4, (N = 11) BaO = 1.4-3.4 wt%), exsolved pyroxene: orthopyroxene host Fs65.5±4.8Wo4.0±1.3 (N = 19) with augite exsolution lamellae Fs33.0±2.3Wo41.6±2.3 (N = 20). The oxygen isotope composition (R. Greenwood, OU) is consistent with a lunar origin (δ17O = 3.14 per mil, δ18O = 6.03 per mil, Δ17O = 0.01 per mil).

 

Classification: Lunar, regolith breccia. Moderate weathering.

 

Specimens: A mass of 80.8 g and two thin sections are on deposit at NHMV.

 

Randy Says…

I have not studied this one. It appears to be a basaltic breccia.

 

More Information

Meteoritical Bulletin Database

NWA 11962

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

 

e-mailkorotev@wustl.edu

Last revised: 24 September 2018