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Lunar Meteorite

Northwest Africa 10149, 10172, 10203, 10272, 10291, & Galb Inal
(assumed paired stones)

northwestern Africa

 

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Two views of Northwest Africa 10149
(photo credit: Mohamed Aid)

 

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Another side of NWA 10149
(photo credit: Darryl Pitt)

 

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The 320-gram stone of Northwest Africa 10172
(photo credit: Mohammed Hmani)

 

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Sawn face of the 328-gram stone of NWA 10172
(photo credit: Mohammed Hmani)

 

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Four of the NWA 10203 stones
(photo credit: Rob Wesel)

 

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Sawn faces of the NWA 10203 stones
(photo credit: Rob Wesel)

 

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Northwest Africa 10272
(photo credit: Fabien Kuntz)

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Northwest Africa 10291. This one is more vesicular than the others.
(photo credit: Fabien Kuntz)

 

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Galb Inal and a slice thereof
(photo credit: unknown)

 

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Lab sample of NWA 10149
(photo credit: Randy Korotev)

 

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Lab sample of NWA 10172
(photo credit: Randy Korotev)

 

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Lab sample of NWA 10203. Click on image for enlargement. . Thanks to Rob Wesel for the sample.
(photo credit: Randy Korotev)

 

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Lab sample of NWA 10272
(photo credit: Randy Korotev)

 

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Lab sample of NWA 10291
(photo credit: Randy Korotev)

 

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Lab sample of Galb Inal. Thanks to Albert Jambon for the sample.
(photo credit: Randy Korotev)

 

from The Meteoritical Bulletin, No. 104

Northwest Africa 10149

Northwestern Africa
Purchased: 2015 April
Mass: 1815 g

Lunar meteorite (feldspathic breccia)

History: Purchased by Darryl Pitt in April 2015 from a dealer in Ouarzazate, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Fragmental breccia composed of mineral clasts of anorthite, olivine, pigeonite, subcalcic augite, augite, fayalite, silica polymorph, exsolved pigeonite, Al-Ti-chromite and Ti-rich chromite, along with sparse glass fragments, in a finer-grained matrix.

Geochemistry: Olivine (Fa35.1; Fa87.0-89.9; FeO/MnO = 91-93, N = 3), pigeonite (Fs41.0Wo7.3; Fs58.3Wo21.3; Fs21.8Wo24.8; FeO/MnO =57-67, N = 3), augite (Fs14.5Wo40.2, FeO/MnO = 45).

Classification: Lunar (feldspathic breccia).

Specimens: 20.1 g included a polished endcut at UWB. The remainder is held by DPitt.

 

from The Meteoritical Bulletin, No. 104

Northwest Africa 10172

Northwestern Africa
Purchased: 2015 April
Mass: 788 g

Lunar meteorite (feldspathic breccia)

History: Purchased by Ali and Mohammed Hmani in April 2015, reportedly from Mauritania.

Physical characteristics: Several identically appearing pieces, 320, 328, and 140 g in several smaller pieces. Irregular exterior. A saw cut reveals a breccia with numerous fragmental feldspathic clasts set in a dark-gray groundmass.

Petrography: (C. Agee, UNM) This meteorite is mixture of a fine-grained cataclastic domains, large fragmental plagioclase and pyroxene crystals, smaller olivine fragments, symplectites, and shock melt veins. Accessory Fe-metal, silica, ilmenite, and chromite were observed.

Geochemistry: (C. Agee and N. Muttik, UNM) olivine Fa36.8±5.3, Fe/Mn=98±5, n=7; pigeonite Fs39.2±12.0Wo13.9±5.1, Fe/Mn=61±5, n=10; augite Fs35.8±16.2Wo36.0±5.1, Fe/Mn=66±9, n=4; plagioclase An93.3±3.7Ab6.1±3.4Or0.5±0.5, n=9; Shock melt (10 µm defocused electron beam, proxy for bulk meteorite composition): SiO2=45.0±1.5, TiO2=0.34±0.14, Al2O3=24.9±6.0, Cr2O3=0.17±0.12, MgO=7.8±3.9, FeO=7.7±4.1, MnO=0.11±0.06, CaO=14.2±2.5, NiO=0.01±0.02, Na2O=0.43±0.14, K2O=0.10±0.02 (all wt%), Fe/Mn=75±17, Mg#=64±5, MgO+FeO=15.6±7.8 (wt%), n=23.

Classification: Lunar (feldspathic breccia).

Specimens: 20.6 g including a probe mount on deposit at UNM; Ali and Mohammed Hmani hold the main mass.

 

from The Meteoritical Bulletin, No. 104

Northwest Africa 10203

Northwestern Africa
Purchased: 2015
Mass: 3300 g

Lunar meteorite

History: Purchased by Aziz Habibi in 2015; reportedly found in near the border between Mauritania and Mali.

Physical characteristics: Twenty-seven identically appearing pieces reportedly found together. Irregular exterior, no fusion crust. A saw cut reveals a polymict breccia with numerous fragmental light and dark clasts.

Petrography: (C. Agee, UNM) This polymict breccia has at least four distinct lithologies. 1) unbrecciated olivine gabbro with zoned clinopyroxene (~75%), acicular, plumose plagioclase (~15%), olivine (~5%), and minor titanomagnetite; 2) fragmental anorthositic gabbro breccia with ~75% plagioclase; 3) fragmental gabbroic breccia with approximately equal proportions of plagioclase, pyroxene and olivine; 4) shock melt veins and pools, some of which are vesicular. Accessory FeNi-metal, silica, ilmenite, troilite, chromite, and phosphate were observed in the fragmental breccias.

Geochemistry: (C. Agee and N. Muttik, UNM) Olivine gabbro: olivine Fa52.9.8±7.1, Fe/Mn=100±12, n=6; clinopyroxene Fs31.1±15.8Wo22.1±7.6, Fe/Mn=41±10, n=7; plagioclase An89.9±3.8Ab8.9±3.4Or1.1±0.8, n=3; anorthositic gabbro breccia: olivine Fa30.6±3.0, Fe/Mn=104±7, n=21; clinopyroxene Fs39.4±15.8Wo21.7±10.9, Fe/Mn=66±11, n=21; plagioclase An96.2±0.8Ab3.5±0.8Or0.2±0.1, n=6; gabbroic breccia: olivine Fa40.3±2.9, Fe/Mn=98±5, n=6; clinopyroxene Fs35.4±14.3Wo23.3±10.0, Fe/Mn=63±10, n=9; plagioclase An93.0±1.6Ab6.6±1.6Or0.4±0.1, n=4; Shock melt (10 µm defocused electron beam, proxy for bulk meteorite composition): SiO2=45.1±2.0, TiO2=0.54±0.38, Al2O3=24.3±6.2, Cr2O3=0.21±0.19, MgO=6.5±2.9, FeO=8.2±3.8, MnO=0.11±0.05, CaO=14.9±1.9, NiO=0.03±0.07, Na2O=0.49±0.13, K2O=0.10±0.03 (all wt%), n=40.

Classification: Lunar (polymict breccia).

Specimens: 24 g including a probe mount on deposit at UNM; Aziz Habibi holds the main mass.

 

from The Meteoritical Bulletin, No. 104

Northwest Africa 10272

(Northwestern Africa)
Purchased: 2015 May
Mass: 74.25 g

Lunar meteorite (feldspathic breccia)

History: Purchased by Pierre-Marie Pelé and Fabien Kuntz in May 2015 from a dealer in Agadir, Morocco.

Physical characteristics: No fusion crust is evident. The interior consists of white to light-gray clasts set in a dark-gray matrix.

Petrography: (A. Irving and S. Kuehner, UWS) Fragmental breccia composed of angular mineral clasts of calcic plagioclase, pigeonite, olivine, orthopyroxene, subcalcic augite, augite, fayalite, silica polymorph, Ti-Cr-rich spinel, Al-Ti-chromite, ilmenite, rare baddeleyite and rare troilite in a finer grained matrix.

Geochemistry: Olivine (Fa18.5-35.8, FeO/MnO = 90-109, N = 3), orthopyroxene (Fs44.9Wo1.8, FeO/MnO = 70), pigeonite (Fs30.3Wo5.7; Fs25.8Wo12.1; FeO/MnO = 55-54), subcalcic augite (Fs56.5Wo25.1, FeO/MnO = 65), augite (Fs18.0Wo37.1, FeO/MnO = 56), fayalite (Fa95.6, FeO/MnO = 96), plagioclase (An88.0-96.9Or0.5-0.2, N = 3).

Classification: Lunar (feldspathic breccia).

Specimens: 15.15 g including one polished endcut at PSF; main mass is held jointly by Mr. P. Pelé and Kuntz.

 

from The Meteoritical Bulletin, No. 104

Northwest Africa 10291

(Northwestern Africa)
Purchased: 2015 May
Mass: 10.01 g

Lunar meteorite (feldspathic breccia)

History: Purchased by Fabien Kuntz in May 2015 from a dealer in Erfoud, Morocco.

Physical characteristics: No fusion crust is present on these three small very similar stones. The interior of each one consists of sparse white to beige clasts in a dark gray matrix containing vesicles.

Petrography: (A. Irving and S. Kuehner, UWS) Mineral fragments of plagioclase, olivine, orthopyroxene, pigeonite (some exsolved), augite, fayalite, silica polymorph, ilmenite, Ti-chromite and troilite, plus rare intersertal basalt clasts, are set in a finer grained vesicular matrix.

Geochemistry: Olivine (Fa30.1-33.7, FeO/MnO = 87-90, N = 3), orthopyroxene (Fs29.2Wo3.6, FeO/MnO = 59), pigeonite (Fs26.4Wo10.3, FeO/MnO = 61), augite (Fs17.9-52.1Wo38.0-40.0, FeO/MnO = 43-75, N = 2), clinopyroxene host (Fs26.9Wo35.8, FeO/MnO = 49), low-Ca pyroxene exsolution lamellae (Fs44.0Wo6.5, FeO/MnO = 63), fayalite (Fa71.0, FeO/MnO = 100), plagioclase (An93.6Or0.1; An61.5Or2.0).

Classification: Lunar (feldspathic regolithic breccia).

Specimens: 2.52 g including a polished slice at PSF; remainder with Kuntz.

 

from The Meteoritical Bulletin, No. 105

Galb Inal

Inchiri, Mauritania
Find: January 2011
Mass: 4050 g

Classification: Lunar meteorite (feldspathic breccia)

History: (H. Chennaoui Aoudjehane, A. Jambon) Found in 2011 by nomads, in a sandy area close to the village of Inal, Mauritania, south of Tichla. The stone was found north of the railway and south of the frontier.  The stone was given the provisional name "Northwest Africa 7173" in Jan 2012, prior to documentation of the find location.

Physical characteristics: A 4 kg crust-free and minimally weathered stone, broken in two pieces. The black lustered stone has up to centimeter-sized white lithic clasts. The surface is sand blasted. Magnetic susceptibility (UPVI): log χ (× 10-9 m3/kg)= 3.93.

Petrography: (A. Jambon, O. Boudouma, UPVI) Feldspathic breccia with a significant melt matrix containing petrographically diverse areas. Lithic (ferro anorthosite, troctolite, spinel troctolite, norite; hedenbergite-fayalite-silica; rare clasts of silica associated with K-feldspar) and mineral fragments, shocked clasts, impact melt pockets, devitrified glassy clasts and glass beads. Contains ilmenite, ulvöspinel, chromite, ilmenite, rutile, (F-Cl) apatite. Rare small grains of troilite, kamacite and schreibersite.

Geochemistry: (A. Jambon, UPVI and R. Korotev, WUSL) Orthocumulate olivine Fa19 (FeO/MnO = 90), plagioclase An94, subcalcic augite Fs22Wo30, Pigeonite Fs27-33Wo5-15 and Fs35-4Wo12-19, Ca-pyroxene core, Fs16Wo31 and rim, Fs41Wo14. Bulk composition: XRF (UPVI) INAA (WUSL). INAA : Na2O = 0.45 wt %; Sc = 21 ppm; Cr = 1400 ppm; FeO = 9.5 wt %; Ni = 200 ppm; Sm = 3.5 ppm, Eu = 0.95 and Ba = 250 ppm. XRF wt %: SiO2 = 45.7; Al2O3 = 21.6; Cr2O3 = 0.2; TiO2 = 0.48; FeO = 9.6; MgO = 4.1; CaO = 17.4; K2O = 0.41. Oxygen isotopes (R. Greenwood, OU) : δ17O‰= 3.238, δ18O‰= 6.198, Δ17O‰= 0.015.

Classification: Lunar regolith breccia. Despite a chemical kinship with NWA 2995 the physical aspect and texture do not favor pairing of these two finds.

Specimens: A 21.5 g type specimen is on deposit at UPVI. Anonymous finder holds the main mass.

 

Randy Says…

These stones may all be paired with the NWA 7834 pair group.

 

More Information

Meteoritical Bulletin Database

NWA 10149 | 10172 | 10203 |10272 | 10291 | Galb Inal

References

Korotev R. L. and Irving A. J. (2014) Keeping up with the lunar meteorites — 2014 (abstract). 45th Lunar and Planetary Science Conference, abstract no. 1405.

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: 22-November-2016