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Lunar Meteorite

Northwest Africa 8222, 10823, 11212, 11237, Rabt Sbayta 002, 004, 005, unnamed 106 & unnamed 115
(presumed paired stones)

northwestern Africa

 

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Northwest Africa 8222
(photo credit: Adam Aaronson)

 

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Sawn face of NWA 8222
(photo credit: Adam Aaronson)

 

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Two slices of Northwest Africa 10823. Click on image for enlargement.
(photo credit: Steve Arnold)

 

 

Northwest Africa 11212
(photo credit: Fabien Kuntz)

 

Two sides of a slice of one of the NWA 11212 pieces
(photo credit: Fabien Kuntz)

 

Lab sample of NWA 11237
(photo credit: Randy Korotev)

 

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Ahmad Ourbaa with 6.4 kg Rabt Sbayta 002
(photo credit: ?)

 

Rabt Sbayta 004
(photo credit: ?)

 

Two of the Rabt Sbayta 005 pieces
(photo credit: Jean Redelsperger)

 

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Two sides of unnamed 106
(photo credit: ?)

 

 

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Lab samples of NWA 8222
(photo credit: Randy Korotev)

 

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Lab sample of Rabt Sbayta 002
photo credit: Randy Korotev)

 

 

Lab sample of Rabt Sbayta 004
photo credit: Randy Korotev)

 

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Lab sample of unnamed 106
photo credit: Randy Korotev)

 

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Lab sample of unnamed 115
photo credit: Randy Korotev)

 

 

from The Meteoritical Bulletin, No. 103

Northwest Africa 8222

(Northwest Africa)
Purchased: 2013 Dec
Mass: 208.6 g

Classification: Lunar meteorite (feldspathic breccia)

History: The stone was purportedly found near Bir Anzarane, and was purchased in Temara, Morocco, by Adam Aaronson in December 2013.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia consisting of separated, angular mineral clasts in a finer-grained, vesicular matrix. Minerals are olivine, anorthite, exsolved pigeonite, augite, chromite, ilmenite, troilite and minor pentlandite.

Geochemistry: Olivine (Fa42.5; Fa80.6; FeO/MnO = 106-134), augite (Fs18.4Wo40.6; FeO/MnO = 54), pigeonite consists of host orthopyroxene (Fs50.1-50.9Wo2.5-5.1; FeO/MnO = 58-64) with exsolution lamellae of augite (Fs38.6Wo41.2; FeO/MnO = 67). Bulk composition (R. Korotev, WUSL) INAA of subsamples gave the following mean abundances (in wt.%) FeO 3.7, Na2O 0.37; (in ppm) Sc 7.0, Ni 90, La 1.4, Sm 0.62, Eu 0.82, Yb 0.54, Lu 0.076, Hf 0.43, Th 0.20.

Classification: Lunar (feldspathic fragmental breccia).

Specimens: A 20.1 g specimen with one polished surface is at UWB. The main mass is held by Aaronson.

 

from The Meteoritical Bulletin, No. 105

Northwest Africa 10823

(Northwestern Africa)
Purchase: 2016
Mass: 202 g

Lunar meteorite (feldspathic breccia)

History: Reportedly found in Western Sahara. Purchased by Steve Arnold from a Moroccan meteorite dealer in 2016.

Physical characteristics: Two identical appearing stones, weathered exterior with no fusion crust. Saw cuts reveal a polymict, feldspathic breccia with numerous white feldspar clasts, many in the range 1-5 mm, set in a dark gray matrix. There are also scattered cm-sized feldspathic clasts present. Some dark-colored domains have only sparse, fine grained, feldspathic clasts.

Petrography: (C. Agee, UNM) This meteorite is a mixture of domains with fine-grained groundmasses of pyroxene+olivine+plagioclase+opaques. Large fragmental plagioclase grains were observed throughout, shock melt veins are also present.

Geochemistry: (C. Agee and M.Spilde, UNM) olivine Fa47.7±9.5, Fe/Mn=95±7, n=11; pigeonite Fs41.9±9.8Wo4.9±3.3, Fe/Mn=61±8, n=12; augite Fs24.9±14.2Wo37.5±6.8, Fe/Mn=61±13, n=10; plagioclase An95.8±0.6Ab4.0±0.6Or0.2±0.1, n=7.

Classification: Lunar (feldspathic breccia).

Specimens: 20.02 g including a probe mount on deposit at UNM, Steve Arnold holds the main mass.

 

from The Meteoritical Bulletin, No. 106

Northwest Africa 11212

(Northwest Africa)
Purchased: 2016 Nov
Mass: 197.5 g

Classification: Lunar meteorite (feldspathic breccia)

History: Purportedly found buried in soil in the strewnfield near Gataa Sfar and purchased by Fabien Kuntz in November 2016 from a dealer in Zagora, Morocco.

Physical characteristics: A group of small stones (total 197.5 g) lacking fusion crust. Fresh interiors exhibit white to beige clasts in a dark gray matrix.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of angular mineral grains of anorthite, olivine, pigeonite, ferropigeonite, subcalcic augite, augite, Ti-chromite and ilmenite in a finer grained, partly vesicular matrix containing kamacite, troilite, pentlandite, Mg-ilmenite and minor barite. Small bubbles are concentrated in groups within the matrix.

Geochemistry: Olivine (Fa28.7-36.1, FeO/MnO = 102-116, N = 3), orthopyroxene (Fs53.4Wo1.7, FeO/MnO = 78), pigeonite (Fs20.6Wo7.8, FeO/MnO = 67), ferropigeonite (Fs56.3Wo21.1, FeO/MnO = 66), subcalcic augite (Fs29.4Wo26.4, FeO/MnO = 71), augite (Fs9.9Wo37.0, FeO/MnO = 68), plagioclase (An94.2-96.7Or0.3, N = 2).

Classification: Lunar (feldspathic breccia). Likely paired with Rabt Sbayta 002 and Rabt Sbayta 004.

Specimens: 20.28 g including one polished endcut at PSF; remainder with Kuntz.

 

from The Meteoritical Bulletin, No. 106

 

Northwest Africa 11237

 

(Northwestern Africa)

Purchased: 2017 January

Mass: 583 g

 

Lunar Meteorite (feldspathic breccia)

 

History: Purchased by Adam Aaronson in January 2017 from a Moroccan dealer at the Tucson Gem and Mineral Show.

 

Physical characteristics: A single stone (583 g) lacking fusion crust. The fresh interior exhibits white to beige clasts in a medium-gray matrix.

 

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of angular mineral grains of anorthite, olivine, pigeonite, exsolved pigeonite, augite, ilmenite, Ti-chromite and troilite, plus sparse glass fragments, set in a finer-grained matrix containing small vesicles and minor barite.

 

Geochemistry: Olivine (Fa30.5-36.8, FeO/MnO = 99-106, N = 3), pigeonite (Fs20.8-33.2Wo6.2-8.4, FeO/MnO = 64-69, N = 2), orthopyroxene host (Fs52.7Wo1.6, FeO/MnO = 71), augite exsolution lamella (Fs21.3Wo43.0, FeO/MnO = 66), augite (Fs19.5Wo42.6, FeO/MnO = 67), anorthite (An96.5-97.6Or0.2-0.3, N = 2).

 

Classification: Lunar (feldspathic breccia)

 

Specimens: 20.3 g including one polished endcut at UWB; remainder with Aaronson.

 

from The Meteoritical Bulletin, No. 106

Rabt Sbayta 002

Rio de Oro, Western Sahara
Find: 2016 August
Mass: 6371.9 g

Classification: Lunar meteorite (feldspathic breccia)

History: Found by Mbarek Laghfiri and Mohamed Chikh Boy near Gataa Sfar in August 2016 and shortly thereafter. Purchased by Darryl Pitt from a Morrocan dealer in Agadir.

Physical characteristics: A single large stone (6371.9 g) lacking fusion crust but with a thin desert patina on exterior surfaces. The fresh interior exhibits pale gray to whitish clasts set in a dark gray, fine grained matrix.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of angular minerals clasts of anorthite, orthopyroxene, olivine, pigeonite, exsolved pigeonite, ilmenite, chromite, fayalite and Ti-chromite in a fine grained, partly vesicular matrix of the same minerals plus troilite and minor barite. Rare quench-textured lithic clasts are present.

Geochemistry: Olivine (Fa23.4, FeO/MnO = 64; Fa43.9, FeO/MnO = 100), orthopyroxene (Fs58.6-60.4Wo2.4-1.9, FeO/MnO = 57-72, N = 2), pigeonite (Fs44.6Wo7.9, FeO/MnO = 54; Fs27.8Wo21.3, FeO/MnO = 47), augite host in exsolved pigeonite (Fs20.9Wo38.4, FeO/MnO = 54), fayalite (Fa78.1, FeO/MnO = 81), plagioclase (An96.5-97.2Or0.2, N = 2). Bulk composition (R. Korotev, WUSL) INAA of subsamples gave the following mean abundances (in wt.%) FeO 3.5, Na2O 0.37; (in ppm) Sc 7.2, Ni 90, La 1.1, Sm 0.57, Eu 0.82, Yb 0.50, Lu 0.07, Hf 0.35, Th 0.14. Magnetic susceptibility log χ (× 10-9 m3/kg) = 2.49.

Classification: Lunar (feldspathic breccia).

Specimens: 22.9 g in the form of a single polished slice at UWB; remainder with DPitt.

 

from The Meteoritical Bulletin, No. 106

Rabt Sbayta 004

Rio de Oro, Western Sahara
Find: 2016 October
Mass: 15,464 g

Classification: Lunar meteorite (feldspathic breccia)

History: Found by Mbarek Laghfiri and Mohamed Chikh Boy near Gataa Sfar in August 2016 and shortly thereafter. Purchased by Darryl Pitt from a Morrocan dealer in Agadir.

Physical characteristics: Found in October 2016 by Oubnaamar Salem in the lunar meteorite strewnfield near Gataa Sfar, and subsequently purchased by Darryl Pitt in December 2016 from a Moroccan dealer.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia consisting of angular mineral grains of anorthite, orthopyroxene, pigeonite (some exsolved), augite, olivine, ilmenite, Cr-rich chromite, Ti-chromite, silica polymorph, fayalite, kamacite and troilite in a finer grained matrix of the same minerals. Portions of the matrix are vesicular and minor calcite is present.

Geochemistry: Olivine (Fa38.5-84.1, FeO/MnO = 70-86, N = 5), low-Ca pyroxene (Fs32.7-38.9Wo2.2-5.3, FeO/MnO = 58-73, N = 4), augite (Fs8.5-20.3Wo45.7-40.7, FeO/MnO = 70-71, N = 3), plagioclase (An94.6-97.3Or0.4-0.22, N = 3).

Classification: Lunar (feldspathic breccia). Likely paired with NWA 8222 and Rabt Sbayta 002 found in the same area.

Specimens: 24.4 g in the form of a two polished endcuts at UWB; remainder with DPitt.

 

from The Meteoritical Bulletin, No. 106

Rabt Sbayta 005

Rio de Oro, Western Sahara
Find: 2016 August
Mass: 20.78 g

Classification: Lunar meteorite (feldspathic breccia)

History: The four fragments were found on a deflation surface by Salem Ben Amar and Amar Zerwal in August 2016. They were purchased from Mohamed Elguirah by Jean Redelsperger in Tan Tan in September 2016.

Physical characteristics: Uncrusted, irregular, dark stones with whitish clasts. Cut surface reveals dark interior with white clasts up to 2 mm.

Petrography: (J. Gattacceca, CEREGE) Brecciated with lithic and mineral clasts (olivine, pigeonite, plagioclase) in a very fine grained plagioclase matrix. Numerous vesicles with diameter 10-20 μm. are present in the matrix. Accessory minerals include chromite, ilmenite. Rare kamacite.

Geochemistry: Olivine Fa33.9±3.3, range Fa31.4-41.2, FeO/MnO = 85.8±9.7 (range 67-98), N=6. Pigeonite Fs40.5±0.8Wo10.2±3.1, FeO/MnO=54.0±6.5 (N=5). Plagioclase An96.5±0.6Ab3.4±0.6Or0.1±0.0 (N=4). Chromite Cr#=Cr/(Cr+Al)=0.64-0.67 (N=2). Magnetic susceptibilty log χ (× 10-9 m3/kg) = 2.58.

Classification: Lunar (feldspathic breccia). Likely paired with Rabt Sbayta 002 and Rabt Sbayta 004 found in the same area.

Specimens: 4.44 g and polished section at CEREGE. Main mass with Jean Redelsperger.

 

Randy Says…

Compositionally, Northwest Africa 8222 and pairs are typical feldspathic lunar meteorite.

 

More Information

Meteoritical Bulletin Database

NWA 8222 | 10823 | 11212 | 11237|
Rabt Sbayta 002 | 004 | 005

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.

 

 

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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: 5-June-2017