E&PS_WU_logo.jpg

 

Lunar Meteorite

Northwest Africa 10509, 10798, La'gad 003, unnamed 101, & unnamed 102

northwestern Africa

 

lm_nwa10509_a.jpg
lm_nwa10509_b.jpg

Two views of Northwest Africa 10509
(photo credit: Weibiao Hsu)

lm_nwa10798BH_cut_m.jpg

The 82-g stone of Northwest Africa 10798. Click on image for enlargement.
(photo credit: Ben Hoefnagels)

lm_nwa10509_2857m.jpg

Lab sample of NWA 10509. Thanks to Weibiao Hsu for the sample.
(photo credit: Randy Korotev)

 

lm_NWA10798_3134-35_m.jpg

Two views of a lab sample of Northwest Africa 10798
(photo credit: Randy Korotev)

 

Samples from 7 pieces of La'gad 003

(photo credit: Randy Korotev)

 

from The Meteoritical Bulletin, No. 105

Northwest Africa 10509

Morocco
Find: 2014
Mass: 660 g

Classification: Lunar meteorite (anorth)

History: Purchased by Ke Zuokai in Dec. 2015 from a Moroccan dealer.

Physical characteristics: A single, irregularly shaped stone lacking fusion crust. Small white clasts are visible in a pale, finer-grained matrix.

Petrography: (W. Hsu, PMO) Fragments of plagioclase (100 μm to sub-mm) set in recrystallized matrix of fine-grained (~ 20 μm) olivine, pigeonite, and plagioclase. Olivine fragments are less abundant.

Geochemistry: Plagioclase (An86.5-98.0Ab3-13Or0-1, average: An94±4Ab5±4) (n=8), olivine (Fa22-41, FeO/MnO = 83-98), pigeonite (Fs17-59Wo3-22, FeO/MnO = 45-61).

Classification: Lunar, anorthositic breccia.

Specimens: 20 g at PMO

 

from The Meteoritical Bulletin, No. 105

Northwest Africa 10798

(Northwestern Africa)
Purchase: 2016 May, August, September
Mass: 318.6 g

Lunar meteorite (feldspathic breccia)

History: A stone was purchased by Ben Hoefnagels in May 2016 from a dealer in Ouarzazate, Morocco. Subsequently additional material was found at the same find site by the same nomad, and purchased by Ben Hoefnagels in August and September 2016.

Physical characteristics: Six larger stones (110.9, 82.1, 32.6, 30.8, 16.9, and 15.4 g) plus many smaller stones (total 29.9 g). All stones have the same distinctive appearance, lacking fusion crust but mostly coated by orange weathering products. The fresh interior exhibits whitish clasts in a light-gray matrix with visible vesicles.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia consisting of rounded to angular gabbroic anorthositic clasts, related crystalline debris, rare mare basalt clasts and very fine grained devitrified glassy clasts in a fine grained, partly vesicular matrix composed of quenchiform crystals plus glass. Minerals are anorthite, exsolved pigeonite, olivine (some forsteritic), augite, subcalcic augite, magnesian orthopyroxene, unexsolved pigeonite, ilmenite, Ti-chromite, troilite, minor primary Ba-Ca-K feldspar and secondary barite.

Geochemistry: Olivine (Fa6.0, FeO/MnO = 129; Fa53.7-60.6, FeO/MnO = 86-95; N = 4), pigeonite (Fs29.2Wo7.7, FeO/MnO = 47; Fs45.3Wo5.6, FeO/MnO = 53; N = 2), augite (Fs18.1Wo39.3, FeO/MnO = 41), orthopyroxene host (Fs59.4Wo2.1, FeO/MnO = 62), clinopyroxene exsolution lamella (Fs25.3Wo41.0, FeO/MnO = 45), plagioclase (An96.2-97.3Or0, N = 2).

Classification: Lunar (feldspathic regolith breccia).

Specimens: 20.66 g including one polished thin section at UWB; remainder with Mr. B. Hoefnagels.

 

from The Meteoritical Bulletin, No. 109

 

La'gad 003

 

Saguia el Hamra, Western Sahara

Find: 2015

Mass: 27.249 kg

 

Lunar Meteorite (feldspathic breccia)

 

History: Found in 2015 by nomads on a small hill named Grarat-Zawi, and purchased by Darryl Pitt on behalf of MMGM from Mauritanian dealers in the period August-October 2015.

 

Physical characteristics: A single, very large stone (27.249 kg) found as a group of many pieces which fit together (but with several missing pieces). The specimen lacks fusion crust, but individual pieces have thin coatings of light-brown weathering products. Fresh interiors exhibit angular, whitish clasts within a dark-gray matrix.

 

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed predominantly of mineral clasts plus rare glass clasts and basalt clasts in a finer grained, partly vesicular matrix. Minerals are anorthite, olivine, pigeonite, orthopyroxene, exsolved pigeonite, subcalcic augite, Al-rich chromite, ilmenite and baddeleyite. Minor amounts of secondary calcite and barite are present.

 

Geochemistry: Olivine (Fa30.0-52.6, FeO/MnO = 84-110, N = 4), pigeonite (Fs28.2-38.2Wo9.8-14.7, FeO/MnO = 50-54, N = 3), orthopyroxene (Fs19.3Wo4.5, FeO/MnO = 57), subcalcic augite (Fs49.6Wo28.3, FeO/MnO = 59), plagioclase (An95.2-97.1Or0.1-0.2, N = 3). Bulk composition (R. Korotev, WUSL) INAA of 10 subsamples from different portions of the reassmbled mass gave the following mean abundances: (in wt.%) FeO 5.95±0.88, Na2O 0.34±0.02, BaO 0.51; (in ppm) Sc 13.6±2.6, Cr 930±210, Ni 140±160, La 2.3±0.6, Sm 1.0±0.2, Eu 0.75±0.06, Yb 0.85±0.14, Lu 0.13±0.02, Hf 0.65±0.13, Th 0.37±0.11.

 

Classification: Lunar (feldspathic regolith breccia). Based on closely similar bulk chemical compositional data (determined by Dr. R. Korotev at WUSL utilizing the same INAA methods), it is likely that the NWA 10509 stone and the material classified as NWA 10798 are paired portions of the same disaggregated meteorite. Another lunar feldspathic meteorite from a different location in the same dense collection area received the name La’gad, but analyses by Dr. Korotev demonstrate that the La’gad stones differ from the material described here, especially in having much higher (by a factor of 6) abundances of Th and other lithophile elements.

 

Specimens: 33.21 g including two polished endcuts at UWB; main mass at MMGM.

 

Randy Says…

These stones are compositionally heterogeneous and together are, along with NWA 6888 and NWA 10495, the most contaminated with terrestrial barium among lunar meteorites.

 

More Information

Meteoritical Bulletin Database

NWA 10509 | 10798 | La'gad 003

References

Korotev R. L. and Irving A. J. (2017) Still not keeping up with the lunar meteorites – 2017. Lunar and Planetary Science XLVIII, abstract no. 1498.

 

 

Back to: Lunar Meteorites | List of Lunar Meteorites | Top of Page

 

 

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: 30 May 2019