Meteoritical Bulletin, No. 108
Northwest Africa 12427
Meteorite (Lunar meteorite (feldspathic breccia))
History: Purchased in November 2017 in Nouakchott, Mauritania.
Reportedly found in northeastern Western Sahara September 2017.
Physical characteristics: Single
stone, no fusion crust; saw cut reveals a breccia with white feldspathic
clasts set in a dark gray groundmass. Some of the feldspathic clasts appear
to be aligned suggesting a mild deformation fabric.
Petrography: (C. Agee, UNM) Microprobe examination shows
fragmental breccia with many anorthositic olivine gabbro clasts set in
fine-grained, cataclastic groundmass. Melt veins
and vesicles are present throughout.
Geochemistry: (C. Agee, UNM) Olivine Fa42.7±6.8,
Fe/Mn=94±5, n=15; clinopyroxene Fs31.4±6.7Wo15.7±6.4,
Fe/Mn=54±5, n=14; plagioclase An96.9±0.2, n=6; shock melt veins
(proxy for bulk composition) SiO2=46.5±2.5, TiO2=0.30±0.15,
MgO=5.2±3.4, FeO=5.5±3.2, MnO=0.08±0.06, CaO=15.6±2.6, Na2O=0.27±0.07,
K2O=0.05±0.02 (all wt%), n=6.
Specimens: 20.2 g on
deposit at UNM, DPitt holds
the main mass.