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Lunar Meteorite

Northwest Africa 8673, 8733, 8746, 10048, 10065, 10123, & 11193
(presumed paired stones)

northwestern Africa

 

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Northwest Africa 8673
(photo credit: Greg Hupé)


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Sawn face of NWA 8673
(photo credit: Greg Hupé)

 

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Northwest Africa 10123

Photo credit: Barbra Barrett

 

Northwest Africa 11193

Photo credit: Ben Hoefnagels

 

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Lab samples of NWA 8673. Click on image for enlargement.
(photo credit: Randy Korotev)

 

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Lab sample of NWA 8733. Note the large metal grain. Thanks to Carl Agee for the sample.
(photo credit: Randy Korotev)

 

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Lab sample of NWA 8746 
(photo credit: Randy Korotev)

 

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Two views of a sample of NWA 10048. Thanks to Carl Agee for the sample.
(photo credit: Randy Korotev)

 

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Lab sample of NWA 10065
(photo credit: Randy Korotev)

 

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Lab sample of NWA 10123

Photo credit: Randy Korotev

 

Lab sample of NWA 11193

Photo credit: Randy Korotev

 

from The Meteoritical Bulletin, no. 103

Northwest Africa 8673

(Northwest Africa)
Purchased: 2014 August
Mass: 263 g

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased by GHupé in August 2014 from a dealer in Erfoud, Morocco.

Physical characteristics: Dark gray stone (263 g) lacking fusion crust. Interior slices exhibit dispersed, small beige clasts and specks of metal.

Petrography: (A. Irving and S. Kuehner, UWS) Fragmental breccia composed of mineral clasts of anorthite, pigeonite, augite and olivine with accessory troilite and kamacite, plus sparse mare basalt clasts, in a finer matrix.

Geochemistry: Olivine (Fa23.0-29.3, FeO/MnO = 87-98, N = 3), orthopyroxene (Fs20.6Wo3.5, FeO/MnO = 58), pigeonite (Fs28.7-29.8Wo8.1-12.0, FeO/MnO = 55-62, N = 2), ferroan pigeonite in mare basalt clast (Fs51.4Wo24.1, FeO/MnO = 56), plagioclase (An93.9-97.8Or0.1-0.2, N = 2). Bulk composition (R. Korotev, WUSL) INAA of subsamples gave the following mean abundances (in wt.%) FeO 7.3, Na2O 0.31; (in ppm) Sc 18, Ni 370, La 4.2, Sm 1.9, Eu 0.73, Yb 1.75, Lu 0.24, Hf 1.5, Th 0.82.

Classification: Lunar (feldspathic fragmental breccia).

Specimens: 20.1 g including one polished endcut at UWB; main mass with GHupé.

 

from The Meteoritical Bulletin, no. 104

Northwest Africa 8733

(Northwest Africa)
Found: 2014 April
Mass: 51 g

Lunar meteorite (basalt/anorthosite)

History: Recovered in April 2014 near the borders of Mauritania, Western Sahara and Algeria. Purchased in Mauritania in June 2014.

Physical characteristics: Six similar stones with irregular dark exteriors. Saw cuts on two of the stones reveal identical textures: a few white plagioclase grains and lithic clasts, set in a dark-gray matrix, also some bright metallic grains up to 1 mm.

Petrography: (C. Agee, UNM) Microprobe examination polished mount shows a polymict breccia with numerous fragmental olivine, pyroxene, and plagioclase crystals; anorthositic and basaltic clasts throughout. Accessory Fe-metal, ilmenite, chromite, silica, and troilite. Calcite weathering products detected.

Geochemistry:(C. Agee and N. Muttik, UNM). Olivine Fa35.0±10.4, Fe/Mn=96±9, range Fa17.9-64.0, n=22; clinopyroxene Fs36.4±11.1Wo17.0±7.5, Fe/Mn=57±6, range Fs22.3Wo5.6-Fs56.6Wo29.0, n=18; plagioclase An95.0±1.4Ab4.5±1.3Or0.4±0.2, n=7. Shock melt (proxy for bulk composition) SiO2=44.0±1.1, TiO2=0.37±0.10, Al2O3=25.1±4.3, Cr2O3=0.20±0.12, MgO=7.9±1.7, FeO=7.3±3.0, MnO=0.09±0.04, NiO=0.01±0.01, CaO=14.5±1.6, Na2O=0.28±0.27, K2O=0.08±0.03 (wt%), n=3.

Classification: Achondrite (lunar basaltic/anorthositic breccia), moderate weathering grade, high shock stage.

Specimens: A total of 10.5 g including a probe mount on deposit at UNM. DPitt holds the main mass.

 

from The Meteoritical Bulletin, No. 104

Northwest Africa 8746

(Northwest Africa)
Purchased: 2014 July
Mass: 69.9 g

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased by Darryl Pitt in July 2014 from a dealer in Mauritania.

Physical characteristics: Single stone (69.9 g) composed of pale clasts in a dark-gray matrix.

Petrography: (A. Irving and S. Kuehner, UWS) Fragmental breccia composed mainly of mineral clasts (anorthite, pigeonite, olivine, subcalcic augite, minor kamacite) plus rare mare basalt clasts and glass fragments within a finer grained matrix.

Geochemistry: Olivine (Fa32.0-48.3, FeO/MnO = 85-91, N = 3), pigeonite (Fs25.6-33.0Wo6.2-7.0, FeO/MnO = 57-66, N = 3), ferroan pigeonite (Fs60.6Wo19.3, FeO/MnO = 79), subcalcic augite (Fs51.0Wo33.4, FeO/MnO = 66), plagioclase (An96.6-97.2Or0.1-0.3, N = 3). Bulk composition (R. Korotev, WUSL) INAA of subsamples gave the following mean abundances (in wt.%) FeO 8.0, Na2O 0.33; (in ppm) Sc 18.6, La 5.9, Sm 2.6, Eu 0.77, Yb 2.2, Lu 0.30, Th 1.1.

Classification: Lunar (feldspathic fragmental breccia).

Specimens: 14.1 g including one polished endcut at UWB; the remainder is held by DPitt.

 

from The Meteoritical Bulletin, No. 104

Northwest Africa 10048

(Northwest Africa)
Purchased: 2015 February
Mass: 352.3 g

Classification: Lunar meteorite

History: Found in December 2014 near the border of Western Sahara and Algeria. Purchased in Mauritania in February 2015.

Physical characteristics: Numerous identical pieces without fusion. Saw cuts show only a few scattered feldspathic clasts and metal grains set in a fairly uniform, dark gray, fine-grained matrix.

Petrography: (C. Agee, UNM) This meteorite is a very fine-grained lunar regolith breccia with some shock melt zones present. Most olivine, pyroxene and plagioclase fragments are less than 50 µm in size. Accessory Fe-Ni metal, iron oxide, chromite, and ilmenite were observed. Thin calcite weathering veins are present.

Geochemistry: (C. Agee and N. Muttik, UNM) olivine Fa31.2±8.3, Fe/Mn=95±12, n=15; pigeonite Fs29.3±6.9Wo10.3±5.4, Fe/Mn=56±5, n=15; augite Fs24.1±7.2Wo30.8±8.8, Fe/Mn=48±3, n=4; plagioclase An96.2±0.5Ab3.3±0.5Or0.4±0.1, n=3; Shock melt (20 µm defocused electron beam, proxy for bulk meteorite composition): SiO2=44.6±0.9, TiO2=0.33±0.07, Al2O3=22.8±2.2, Cr2O3=0.20±0.04, MgO=9.1±1.8, FeO=8.0±1.4, MnO=0.11±0.02, CaO=13.9±1.0, NiO=0.03±0.02, Na2O=0.34±0.03, K2O=0.10±0.02 (all wt%), Fe/Mn=71±7, Mg#=67±5, n=10.

Classification: Lunar, regolith breccia

Specimens: 20.1 g including a probe mount on deposit at UNM, DPitt holds the main mass.

 

from The Meteoritical Bulletin, No. 104

Northwest Africa 10065

(Northwest Africa)
Purchased: 2014 June
Mass: 282.8 g

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased by Darryl Pitt in July 2014 from a dealer in Mauritania.

Physical characteristics: Single stone (282.8 g) coated by orange-brown weathering products. The fresh interior is dark gray with white clasts and visible fresh metal grains.

Petrography:(A. Irving and S. Kuehner, UWS) Breccia composed of mineral clasts of anorthite, pigeonite (some exsolved), olivine, orthopyroxene, subcalcic augite, augite, ferropigeonite, Ti-Cr-bearing spinel, kamacite, troilite and rare silica polymorph, together with rare devitrified glass spheres (of anorthite+pyroxene bulk composition), in a finer grained matrix containing sparse vesicles.

Geochemistry: Olivine (Fa26.4-58.6, FeO/MnO = 94-100, N = 3), orthopyroxene (Fs11.4-19.2Wo3.7-3.5, FeO/MnO = 87-68, N = 2), pigeonite (Fs32.6Wo8.2, FeO/MnO = 65), ferropigeonite (Fs45.5-64.8Wo20.4-22.6, FeO/MnO = 65-73, N = 2), subcalcic augite (Fs22.1Wo35.8, FeO/MnO = 58), augite (Fs13.0-13.9Wo38.5-41.9, FeO/MnO = 51-56, N = 2), plagioclase (An95.4-96.3Or0.2, N = 2). Bulk composition (R. Korotev, WUSL) INAA of subsamples gave the following mean abundances (in wt.%) FeO 7.9, Na2O 0.32; (in ppm) Sc 17.4, Ni 490, La 5.1, Sm 2.29, Eu 0.73, Yb 2.0, Lu 0.28, Hf 1.7, Th 1.1.

Classification: Lunar (feldspathic regolithic breccia). Bulk abundances for many elements overlap with those for NWA 8746, suggesting pairing of these two stones.

Specimens: 21.4 g including one polished endcut at UWB. The remainder is held by DPitt.

 

from The Meteoritical Bulletin, No. 104

 

Northwest Africa 10123

 

(northwestern Africa)

Purchased: 2015 January

Mass: 149.5 g

 

Classification: Lunar meteorite (feldspathic breccia)

 

History: Purchased by Darryl Pitt in January 2015 from a dealer in Zagora, Morocco.

 

Petrography: (A. Irving and S. Kuehner, UWS) Very fine grained fragmental breccia consisting mostly of mineral clasts of olivine, anorthite, orthopyroxene, pigeonite, augite and Al-chromite set in a matrix of the same minerals plus minor kamacite and barite.

 

Geochemistry: Olivine (Fa22.2-33.9, FeO/MnO = 82-97, N = 3), low-Ca pyroxene (Fs20.4-23.4, FeO/MnO = 46-54, N = 2), pigeonite (Fs33.1Wo8.2, FeO/MnO = 53), subcalcic augite (Fs13.0Wo36.6, FeO/MnO = 45). Plagioclase >An95 by EDS analysis.

 

Classification: Lunar (feldspathic breccia).

 

Specimens: 20.1 g including one polished endcut at UWB. The remainder is held by DPitt.

 

from The Meteoritical Bulletin, No. 106

 

Northwest Africa 11193

 

(northwestern Africa)

Purchased: 2016 June

Mass: 155 g

 

Classification: Lunar meteorite (feldspathic breccia)

 

History: Purchased by Ben Hoefnagels in June 2016 from a dealer in Taliouine, Morocco..

 

Physical characteristics: A single stone (155 g) composed of angular white and light-gray clasts in a fine-grained gray matrix containing visible small grains of metal.

 

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of angular mineral grains of anorthite, olivine, orthopyroxene, zoned pigeonite, subcalcic augite, ferropigeonite, chromite, Ti-chromite, ilmenite and fayalite in a finer grained matrix containing kamacite, troilite, baddeleyite, Zr-Ca-Cr-bearing titanate and calcite.

 

Geochemistry: Olivine (Fa26.7-47.5, FeO/MnO = 94-98, N = 3), orthopyroxene (Fs21.5Wo4.5, FeO/MnO = 84), pigeonite (core Fs35.7Wo11.4; rim Fs47.2Wo13.4; FeO/MnO = 61-70), ferropigeonite (Fs69.6-69.9Wo21.6-24.6, FeO/MnO = 71-77, N = 2), subcalcic augite (Fs15.4Wo33.4, FeO/MnO = 65), plagioclase (An95.3-97.1Or0.6-0.2, N = 2). Bulk composition (R. Korotev, WUSL): INAA of subsamples gave the following mean abundances (in wt.%) FeO 7.7, Na2O 0.44; (in ppm) Sc 17.1, Ni 340, La 6.2, Sm 2.47, Eu 0.77, Yb 1.97, Lu 0.28, Hf 2.0, Th 1.4.

 

Classification: Lunar (feldspathic breccia).

 

Specimens: 20.3 g including a polished endcut at UWB; remainder with Mr. B. Hoefnagels.

 

Randy Says…

The Northwest Africa 8673 clan is compositionally indistinguishable from Dhofar 925/960 and SaU 449 from Oman.  The texture is different, however.

 

More Information

Meteoritical Bulletin Database

NWA 8673 | 8733 | 8746 | 10048 | 10065 | 10123 | 11193

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: 12-April-2017