from The Meteoritical Bulletin, No. 108
Northwest Africa 12826 (NWA 12826)
History: The meteorite was purchased from a local meteorite dealer in Algeria.
Physical characteristics: Many brownish fragments with some fusion crust.
Petrography: (A. Greshake, MNB) The meteorite is a feldspathic breccia composed of mineral fragments, basaltic clasts, and impact melt clasts set into a fine-grained partly shock-melted groundmass. Most abundant minerals are calcic plagioclase and pigeonite; less abundant are augite and olivine. Accessories include FeS, ilmenite, and FeNi-metal. The meteorite contains shock melt veins.
Geochemistry: olivine: Fa28.3±6.7 (Fa19.7-35.1, FeO/MnO=97±10, n=15); pigeonite: Fs30.9±6.4Wo11.2±4.9 (Fs21.9-40.1Wo6.4-18.9, FeO/MnO=57±6, n=27); Ca-pyroxene: Fs12.5±0.8Wo39.8±2.3 (Fs11.7-14.6Wo33.2-41.3, FeO/MnO=40±4, n=11); calcic plagioclase: An96.9±0.6 (An95.2-97.7, n=17).
Classification: Lunar (feldspathic breccia).
Specimens: 5 g Museum für Naturkunde, Berlin, Germany.
I have not studied Northwest Africa 12826.
Meteoritical Bulletin Database