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Lunar Meteorite

Lahmada 020 & 046
(assumed pairs)

Western Sahara

 

A large slice of Lahmada 020. Mendy says “The strange looking "scratches" appear to be contraction cracks. They are not due to the polish or prep.” Click on image for enlargement.
(photo credit: Mendy Ouzillou)

 

Lahmada 020: A large FeNi metal grain (top left), a larger anorthosite clast (bottom right). and veins filled with terrestrial evaporite minerals.
(photo credit: Mendy Ouzillou)

 

Lahmada 020: Glassy melt with vesicles.
(photo credit: Mendy Ouzillou)

 

Slice of Lahmada 020
(photo credit: M. Lyon)

 

from The Meteoritical Bulletin, No. 108

 

Lahmada 020

 

Western Sahara

Find: 2018 November

Mass: 12,168 g

 

Lunar Meteorite (feldspathic breccia))

 

History: Found at a location north of Jdiriya, Morocco, near Oued Skikima, in November 2018. Material was obtained by Ahmad Bouragaa and Aziz Habibi, and some was purchased by Mark Lyon and Mendy Ouzillou in November 2018.

 

Physical characteristics: Multiple pieces (total 12.168 kg) of the same distinctive very fine grained, dark gray microvesicular material with sparse, irregularly distributed small milky clasts.

 

Petrography: (A. Irving and S. Kuehner, UWS) Sparse, very small mineral clasts of anorthite, olivine, pigeonite and augite occur within a dominant extremely fine grained, microvesicular matrix containing accessory kamacite, troilite and minor barite.

 

Geochemistry: Olivine (Fa34.0-35.8, FeO/MnO = 86-94, N = 2), pigeonite (Fs22.7-28.6Wo8.2-8.8, FeO/MnO = 49-59, N = 2), augite (Fs17.1-17.4Wo38.5-36.6, FeO/MnO = 51-54, N = 2), anorthite (An95.8-96.9Wo0.4-0.2, N = 2).

 

Classification: Lunar (feldspathic regolith melt breccia).

 

Specimens: 20.62 g including a polished slice and one polished thin section at UWB; remainder with A. Bouragaa, A. Habibi, M. Lyon and M. Ouzillou.

 

from The Meteoritical Bulletin, No. 108

 

Lahmada 046

 

Western Sahara

Find: 2018 October 11

Mass: 71.24 g

 

Lunar Meteorite (feldspathic breccia))

 

History: Bought from Amar Nogout in Erfoud in May 2015. [sic]

 

Physical characteristics: Gray rock without fusion crust. Cut surface reveals black interior with mm-sized, whitish clasts.

 

Petrography: (J. Gattacceca, CEREGE) Sparse mineral clasts (anorthite, olivine, pyroxene) in a melt-rock matrix. Melt rock has numerous vesicles with typical sizes 50 µm. Troilite and rare metal are found in the melt rock.

 

Geochemistry: Anorthite An96.8Ab3.0Or0.2 (n=2). Augite Fs16.8±0.3Wo36.3±0.1, FeO/MnO = 59.0 (n=2). Olivine Fa33.4±1.5, FeO/MnO=72.3±7.2 (n=3)

 

Classification: Lunar (feldspathic melt breccia). Possibly paired with Lahmada 020

 

Specimens: Type specimen at CEREGE. Main mass with Pierre-Marie Pelé.

 

 

Randy Says…

I have not studied either of these. They may not be paired, but I list them together here because of the suggestion in the Lahmada 046 “Classification” statement.

 

More Information

Meteoritical Bulletin Database

Lahmada 020 | 046

References

 

 

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: 9 July 2019