Lunar Meteorite: Northwest Africa 13837

from The Meteoritical Bulletin, No. 110

Northwest Africa 13837 (13837)

northwestern Africa
Purchased: 2020 October
Mass: 20.31 g (7 pieces)

Classification: Lunar meteorite (troctolite)

Physical characteristics: Brownish stone. Interior is almost black.

Petrography: (J. Gattacceca, CEREGE) Granular igneous rock with grain size 600 µm. The main mineral is olivine. Other minerals are pyroxene and plagioclase, accessory chromite and ilmenite (to 200 µm), minor troilite (100 µm) and kamacite (to 50 µm).

Geochemistry: Olivine Fa _37.8±2.6, FeO/MnO 111.2±18.4 (n=6). Pyroxene Fs_28.8±6.7Wo_14.7±9.5, FeO/MnO = 64.4±7.5 (n=4). Plagioclase An_84.8±5.1Ab_13.8±3.8Or_1.4±1.4 (n=8). Chromite Cr# = 0.77 (n=1).

Classification: Achondrite (lunar troctolite)

Specimens: Type specimen at CEREGE. Main mass with Kuntz.

Randy Says…

I have not studied NWA 13785. From the description and photo, it is not self-evidently paired with the NWA 773-clan troctolites, the NWA 5744 clan, or NWA 12971.

More Information

Meteoritical Bulletin Database

NWA 13837