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Northwest Africa 11421 (NWA 11421)
Classification: Lunar meteorite
History: The meteorite was bought in 2017 from a meteorite dealer in Erfoud, Morocco.
Physical characteristics: Many small grayish individuals lacking any fusion crust. White to beige clasts in greyish matrix are visible at the surface.
Petrography: The meteorite is a breccia composed of angular to subrounded whitish clasts up to 1 cm in size set into a greyish vitreous groundmass. Mineral fragments are also present in the matrix. Dominant mineral phases are low-Ca pyroxene, Ca- pyroxene, olivine and calcic plagioclase. Minor phases include chromite, ilmenite, fayalite, pyrrhotite, FeNi metal, and barite. Contains some melt regions displaying quenching textures of dendritic pyroxene and plagioclase.
Geochemistry: olivine: Fa30.1±10.4 (Fa18.4-52, n=16, FeO/MnO=79-112); low-Ca pyroxene: Fs33.3±2,8Wo2.5±1.0 (Fs30.4-36.4Wo1.4-3.8, n=10, FeO/MnO=55-64); Ca-pyroxene: Fs16.1±4.0Wo40.0±4.2 (Fs8.9-23.2Wo31.3-45.1, n=14, FeO/MnO=36-64); calcic plagioclase: An96.4±0.8 (An95.4-98.0, n=16)
Classification: Lunar (feldspathic breccia)
Place of purchase: Erfoud, Morocco
Date: P 2017
Mass (g): 912
Shock stage: moderate
Weathering grade: low
Fayalite (mol%): 30.1
Ferrosilite (mol%): 33.3; 16.1
Wollastonite (mol%): 2.5; 40.0
Classifier: A. Greshake, MNB
Type spec mass (g): 21.4
Type spec location: MNB
Main mass: Tomasz Jakubowski and Marcin Cimala
Comments: Submitted by Ansgar Greshake