Lunar Meteorite: Northwest Africa 13546

northwestern Africa

from The Meteoritical Bulletin, No. 109

Northwest Africa 13546 (NWA 13546)

northwestern Africa
Purchased: 2020
Mass: 2300 g (many pieces)

Classification: Lunar meteorite (feldspathic breccia)

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

Physical characteristics: Many small greyish fragments some of which covered with fusion crust.

Petrography: The meteorite displays a grayish interior and is a feldspathic breccia composed of mineral fragments, basaltic, gabbroic, and impact melt clasts cemented by a fine-grained partly shock-melted groundmass. Most abundant minerals are calcic plagioclase, olivine of highly variable composition, and exsolved pyroxene; less abundant are and complex zoned pyroxenes. Accessories include ilmenite, and FeNi-metal. The meteorite contains shock melt veins and pockets.

Geochemistry: (A. Greshake, MNB) olivine: Fa21.3±11.1 (Fa9.9-44.3, FeO/MnO=79±8, n=26); fayalite: Fa95.5±0.2, FeO/MnO=85±3, n=6; low-Ca host to augite exsolution lamellae: Fs49.2±0.6Wo4.3±0.7 (Fs47.8-50.3Wo3.5-5.7, FeO/MnO=56±3, n=11); augite exsolution lamellae: Fs23.3±0.8Wo41.0±0.6 (Fs22.4-25.1Wo39.3-41.5, FeO/MnO=53±6, n=10); complex zoned pyroxene: Fs38.1±10.0Wo21.5±13.8 (Fs25.8-49.6Wo5.6-39.0, FeO/MnO=50±3, n=11); calcic plagioclase: An97.6±0.3 (An97.1-97.9, n=14)

Classification: Lunar meteorite (feldspathic breccia); likely paired with NWA 11273

Specimens: MNB. Larbi Chnaoui holds the main mass.

Randy Says…

I have not studied NWA 13484. I suspect that it, like NWA 11273, is another pair of NWA 8046.

More Information

Meteoritical Bulletin Database

NWA 13546

Lunar Meteorites | List of Lunar meteorites