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Lunar Meteorite

Northwest Africa 8641, 8682, 10049, 10077, & 10133
(paired stones)

northwestern Africa

lm_nwa8641_P1040267.jpg

Northwest Africa 8641
(photo credit: unknown)

 

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The 7 stones of Northwest Africa 8682
(photo credit: Youssef Ait Elcaid)

 

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lm_nwa8682_SA_0.913g.jpg

The largest NWA 8682 stone
(photo credit: Steve Arnold)

 

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NWA 10049
(photo credit: Carl Agee)

 

NWA 10077
(photo credit: unknown)

 


Some of the NWA 10133 stones are dark while others are light.
(photo credit: Sergey Vasiliev and Marc Jost)

 

Cut faces of one of the larger NWA 10133 stones
(photo credit: Photo courtesy of Sergey Vasiliev and Marc Jost)

 

Lab sample of NWA 8641.
(photo credit: Randy Korotev)

 

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Lab sample of NWA 8682.
(photo credit: Randy Korotev)

 

Lab sample of NWA 10049.
(photo credit: Randy Korotev)

 

from The Meteoritical Bulletin, No. 103

Northwest Africa 8641

(Northwest Africa)
Purchased: 2014 May
Mass: 5895 g

Lunar meteorite (feldspathic breccia)

History: Purchased in May 2014 by Darryl Pitt from a dealer in Erfoud, Morocco.

Physical characteristics: A large (5895 g) rounded, ellipsoidal dark gray stone with white clasts visible and with a beige, clayey coating on one side.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of light colored clasts in a darker matrix. Major minerals are olivine, orthopyroxene, pigeonite, augite and anorthite. Minor constituents include symplectitic intergrowths of fayalite+hedenbergite+silica polymorph, ilmenite, Ti-rich chromite, troilite, and rare exsolved pigeonite, kamacite and secondary barite.

Geochemistry: Olivine (Fa23.3-31.8; FeO/MnO = 94-97, N = 3), orthopyroxene (Fs29.7Wo3.1; FeO/MnO = 64), pigeonite (Fs24.1Wo6.4; FeO/MnO = 59), augite (Fs13.6-39.4Wo39.4-43.5; FeO/MnO = 44-45, N = 2), plagioclase (An94.6-99.7Or0.3-0.1, N = 3). Bulk composition (R. Korotev, WUSL) INAA of subsamples gave the following mean abundances (in wt.%) FeO 5.35, Na2O 0.48; (in ppm) Sc 12.3, Ni 140, Ba 320, La 6.4, Sm 2.9, Eu 1.05, Yb 2.0, Lu 0.287, Hf 2.1, Th 0.90.

Classification: Lunar (feldspathic regolithic breccia).

Specimens: 20.5 g including a polished endcut at UWB. The remainder is held by DPitt.

 

from The Meteoritical Bulletin, No. 103

Northwest Africa 8682

(Northwest Africa)
Purchased: 2014 May
Mass: 82 g

Lunar meteorite (feldspathic breccia)

History: Purchased by Steve Arnold in August 2014 from a dealer in Zagora, Morocco.

Physical characteristics: A batch of identical stones (total weight 82 g), each of which is partly coated by pale tan, clayey soil. Interiors consist of small white to beige clasts in gray matrix.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of a variety of mineral clasts and sparse, small mare basalt clasts in a finer grained, vesicular matrix. Minerals are olivine (including unusually forsteritic grains associated with Cr-pleonaste), orthopyroxene, pigeonite, augite, anorthite, intermediate plagioclase, silica polymorph, fayalite, ilmenite, baddeleyite, troilite, kamacite, merrillite, zirconolite, and minor secondary barite and calcite. One unusual clast consists of K-feldspar + silica polymorph with accessory zirconolite and an unknown Th-Zr-Ti mineral.

Geochemistry: Olivine (Fa6.8, FeO/MnO = 60; Fa27.4-50.3, FeO/MnO = 91-103, N = 4), orthopyroxene (Fs24.5-39.8Wo4.2-4.1, FeO/MnO = 57-69, N = 2), subcalcic augite (Fs16.0-34.4Wo36.4-36.0, FeO/MnO = 45-55, N = 3), fayalite (Fa93.2, FeO/MnO = 79), anorthite (An95.1-96.6Or0.3, N = 2), plagioclase (An49.1Or1.1; An70.7Or1.8).

Classification: Lunar (feldspathic regolithic breccia).

Specimens: 16.4 g including one polished endcut at UWB. The remaining material is held by Mr. S. Arnold.

 

from The Meteoritical Bulletin, No. 104

Northwest Africa 10049

(Northwest Africa)
Purchased: July
Mass: 56 g

Lunar meteorite (feldspathic breccia)

History: Single stone. Saw cut shows white feldspathic clasts and a few dark colored clasts set in a dark gray matrix. There a few, very small, metal grains visible.

Petrography: (C. Agee, UNM) This meteorite is a fine-grained, lunar feldspathic regolith breccia with numerous agglutinates, shock melt zones and impact melt clasts present. Many of the agglutinates and melt veins are heavily vesiculated. There are also many fragmental feldspar grains and some microgabbros present, a few of these fragments are up to several mm in size. Accessory Fe-Ni metal, Fe-sulfide, chromite, and ilmenite are present. Weathering products iron oxide, barite, and calcite were detected.

Geochemistry: (C. Agee and N. Muttik, UNM) Olivine Fa31.5±4.9, Fe/Mn=99±9, n=29; forsterite Fa5.8, Fe/Mn=87, n=1; pigeonite Fs26.6±5.5Wo6.0±3.8, Fe/Mn=55±4, n=10; augite Fs22.7±8.2Wo33.1±6.9, Fe/Mn=52±8, n=14; anorthite plagioclase An94.2±2.6Ab5.4±2.5Or0.3±0.2, n=10; labradorite plagioclase An56.3Ab37.1Or6.6, n=1; Shock melt (20 µm defocused electron beam, proxy for bulk meteorite composition): SiO2=44.5±0.8, TiO2=0.25±0.08, Al2O3=31.3±1.9, Cr2O3=0.07±0.01, MgO=3.2±1.8, FeO=3.0±0.4, MnO=0.04±0.02, CaO=17.4±0.4, NiO=0.00±0.00, Na2O=0.55±0.09, K2O=0.07±0.01 (all wt%), n=3.

Classification: Lunar feldspathic regolith breccia

Specimens: 12.4 g including a probe mount on deposit at UNM, Twelker holds the main mass.

 

from The Meteoritical Bulletin, No. 103

Northwest Africa 10077

(Northwest Africa)
Purchased: 2014 July
Mass: 5.27 g

Lunar meteorite (feldspathic breccia)

History: Purchased by Fabien Kuntz in July 2014 from a dealer in Foum El Hisn, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of angular mineral fragments in a finer grained matrix containing vesicles. Minerals are anorthite, olivine, orthopyroxene, pigeonite, silica polymorph, bytownite, Cl-bearing apatite, ilmenite, troilite and kamacite.

Geochemistry: Olivine (Fa23.9-32.0, FeO/MnO = 84-94, N = 3), orthoproxene (Fs26.6Wo3.5, FeO/MnO = 68, N = 1), pigeonite (Fs21.3-23.6Wo17.4-10.9, FeO/MnO = 53-63, N = 3), plagioclase (An95.3-96.5Or0.4; An83.2Or0.8; N = 3). Bulk composition (R. Korotev, WUSL) INAA of subsamples gave the following mean abundances (in wt.%) FeO 5.2, Na2O 0.48; (in ppm) Sc 10.2, La 5.9, Sm 2.7, Eu 1.11, Yb 1.83, Lu 0.25, Th 0.9.

Classification: Lunar (feldspathic regolithic breccia). Paired with NWA 8641 based on texture and bulk composition.

Specimens: 1.08 g piece polished on one side at PSF; main mass with Kuntz.

 

from The Meteoritical Bulletin, No. 104

Northwest Africa 10133

(Northwest Africa)
Purchased: 2014 April
Mass: 54.2 g

Lunar meteorite (feldspathic breccia)

History: Purchased in April 2014 by Sergey Vasiliev and Marc Jost from a dealer in Tan Tan, Morocco.

Physical characteristics: A group of many small beige to gray stones (total 54.2 g).

Petrography: (A. Irving and S. Kuehner, UWS) Following optical examination of all of the small stones constituting the type material, three representative stones were selected for detailed microprobe and bulk chemical analysis. Each specimen consists of small mineral clasts of anorthite, olivine, pigeonite, orthopyroxene, augite, subcalcic augite, forsterite, fayalite, silica polymorph, ilmenite, troilite, zircon (one grain >100 µm) and rare kamacite set within a fine grained vesicular matrix containing minor barite. Rare mare basalt lithic clasts are also present.

Geochemistry: Olivine (Fa6.0, FeO/MnO = 71; Fa22.7-29.9, FeO/MnO = 91-106, N = 2; Fa84.3-89.4, FeO/MnO = 88-99, N = 2), pigeonite (Fs24.6-31.9Wo11.4-6.5, FeO/MnO = 56-72, N = 3), orthopyroxene (Fs26.8-45.0Wo4.4-3.8, FeO/MnO = 61-73, N = 2), subcalcic augite (Fs22.0-48.5Wo25.1-33.0, FeO/MnO = 62-66, N = 3), augite (Fs13.1-38.5Wo44.5-39.6, FeO/MnO = 49-60, N = 2), plagioclase (An93.5-96.5Or0.4-0.1, N = 4). Bulk composition (R. Korotev, WUSL): mean abundances for three separate stones determined by INAA of subsamples are as follows: #A (in wt.%) FeO 5.1, Na2O 0.49; (in ppm) Sc 10.1, Cr 790, Ni 150, La 5.9, Sm 2.7 Eu 1.07, Yb 1.8, Lu 0.26, Hf 1.9, Th 0.9; #B (in wt.%) FeO 6.1, Na2O 0.50; (in ppm) Sc 12.0, Cr 930, Ni 290, La 10.0, Sm 4.6, Eu 1.15, Yb 3.2, Lu 0.44 Hf 4.0, Th 1.6; #D (in wt.%) FeO 5.5, Na2O 0.49; (in ppm) Sc 10.0, Cr 760, Ni 280, La 9.2, Sm 4.3, Eu 1.20, Yb 2.8, Lu 0.39, Hf 3.2, Th 1.4.

Classification: Lunar (feldspathic regolithic breccia). Despite the mineralogical and compositional heterogeneity among these small stones, we conclude that they are paired with Northwest Africa 8641, Northwest Africa 8682 and Northwest Africa 10077.

Specimens: 10.9 g including two polished pieces at UWB. The remaining material is held jointly by Mr. S. Vasiliev and Mr. M. Jost.

 

Randy Says…

The Northwest Africa 8641 clan is most similar in composition to NWA 5000, but totally different in texture and internal appearance.

 

More Information

Meteoritical Bulletin Database

NWA 8641 | 8682 | 10049 | 10077 | 10133

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: 24-Dec-2015