Lunar Meteorite: Northwest Africa 13625

from The Meteoritical Bulletin, No. 109

Northwest Africa 13625 (NWA 13625)

northwestern Africa
Purchased: 2020 October
Mass: 54 g (1 piece)

Classification: Lunar meteorite (feldspathic breccia)

History: The meteorite was purchased from a dealer in Morocco.

Physical characteristics: Dark-grayish fragment without fusion crust

Petrography: Feldspathic breccia composed of mineral fragments, basaltic, and impact melt clasts cemented by a mostly shock-melted groundmass. Predominant minerals are calcic plagioclase, olivine, exsolved pyroxene, and pyroxenes showing complex patchy zoning. Minor phases are chromite, ilmenite, and FeS. No metallic was detected. Shock melt frequently shows schlieren and pronounced flow textures.

Geochemistry: (Ansgar Greshake, MNB) olivine: Fa_23.7±7.3 (Fa_16.9-44.1, FeO/MnO=83±8, n=16); fayalite: Fa_80.8±0.1, FeO/MnO=95±2, n=2; low-Ca pyroxene: Fs_19.6±0.2Wo_3.2±0.7 (Fs_19.3-19.8Wo_2.2-4.2, FeO/MnO=45±4, n=5); Ca-pyroxene: Fs_8.2±0.3Wo_44.1±0.8 (Fs_7.6-8.6Wo_42.8-45.4, FeO/MnO=28±2, n=6); complex zoned pyroxene: Fs_38.3±9.6Wo_15.4±3.2 (Fs_29.2-50.9Wo_9.3-18.6, FeO/MnO=55±8, n=5); calcic plagioclase: An_96.1±0.8 (An_95.2-97.0, n=7)

Classification: Lunar (feldspathic breccia )

Specimens: MNB. Larbi Chnaoui holds the main mass.

Randy Says…

I have not studied NWA 13625. It might be another stone of the NWA 8046 clan.

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