Lunar Meteorite: Northwest Africa 13785

northwestern Africa

from The Meteoritical Bulletin, No. 110

Northwest Africa 13785 (NWA 13785)

northwestern Africa
Purchased: 2021
Mass: 35 g (1 piece)

Classification: Lunar meteorite

History: The meteorite was purchased by the main mass holder from a dealer in Erfoud, Morocco.

Physical characteristics: Dark-grayish rock without fusion crust.

Petrography: (A. Greshake, MNB) The meteorite displays a dark-grayish interior and is a polymict breccia predominantly composed of lithic and mineral clasts cemented by abundant shock melted and partly vesicular matrix. Lithic clasts are gabbroic and impact melts clasts up to 5 mm in size. Dominant minerals are pigeonite, augite, olivine, and calcic plagioclase. Minor phases are ilmenite and FeS. In the matrix flow textures are abundant.

Geochemistry:  pigeonite: Fs26.6±2.2Wo10.4±3.7 (Fs23.3-30.8Wo5.5-19.0, FeO/MnO=50±3, n=16); augite: Fs22.1±2.2Wo35.3±1.6 (Fs20.0-26.3Wo33.4-37.9, FeO/MnO=49±5, n=5); olivine: Fa36.3±0.2, (Fa36.0-36.6, FeO/MnO=93±8, n=12); plagioclase: An97.4±1.1 (An96.1-98.7, n=10)

Geochemistry:  Microgabbro: olivine (Fa30.0±8.9, Fe/Mn=80.4±10.2, n=12); low Ca pyroxene (Fs24.7±2.1Wo4.1±0.6, Fe/Mn=55.6±6.5, n=5); Mineral fragments: pigeonite (Fs30.9±6.2Wo12.0±5.0, Fe/Mn=52.9±4.2, n=15); high Ca pyroxene (Fs43.6±16.2Wo27.4±4.8, Fe/Mn=56.7±7.6, n=6); plagioclase (An96.8±0.9Or0.1±0.1, n=15).

Classification: Lunar (feldsp. breccia)

Specimens: 7.1 g at MNB. Main mass: Philippe Schmitt-Kopplin

Randy Says…

I have not studied NWA 13785. From the description, it may be another NWA 8673 pair.

More Information

Meteoritical Bulletin Database

NWA 13785

Lunar Meteorites | List of Lunar meteorites