Northwest Africa 6221 (NWA 6221)
(Northwest Africa)
Purchased: Apr 2010
Classification: Lunar meteorite (feldspathic breccia)
History: Purchased by P. Thomas in April 2010 from a dealer who reported that this stone was found near Geltat Zemmour.
Physical characteristics: One single stone, dark gray with white clasts.
Petrography: (A. Jambon, O. Boudouma, D. Badia) Small mineral clasts in a fine-grained matrix with some heterogeneous glass (impact melt glass). Contains plagioclase, pigeonite, augite, ilmenite, olivine, merrilite. Rare lithic clasts.
Geochemistry: Feldspar An96-89. Augite (Fs27-22Wo40-30, Fe/Mn=60). Olivine (Fa=12-29, Fe/Mn=60). Ilmenite with 6% MgO. Bulk composition (R. Korotev, WUSL): FeO 6.6 wt%, Sc 9.7 ppm, Ni 1120 ppm, Sm 5.7 ppm, Th 1.7 ppm.
Classification: Lunar (feldspathic breccia). Probably paired with NWA 4936 and NWA 5406.