from The Meteoritical Bulletin, No. 112
Northwest Africa 15800 (NWA 15800)
Lunar meteorite (feldspathic breccia)
History: The meteorite was purchased from a group of meteorites hunters in Nouadhibou, Mauritania, in January, 2023.
Physical Characteristics: Dark grayish rock lacking fusion crust.
Petrography: (A. Greshake, MNB)Polymict breccia composed of up to 1 cm sized feldspathic melt clasts and a great diversity of up to 8 mm sized mineral fragments set in a fine-grained partly shock molten matrix. Dominant minerals are olivine of different chemical composition, low-Ca pyroxene, exsolved pyroxene, spinel, and anorthite that has been completely coverted into maskelynite. Minor phases include ilmenite, troilite, and FeNi metal.
Geochemistry: (A. Greshake, MNB) Compositions of olivine: Fa11.2±0.1, FeO/MnO=77±9, n=10; Fa19.9±0.2, FeO/MnO=84±7, n=10; Fa34.0±0.6, FeO/MnO=93±7, n=7; Fa53.8±0.3, FeO/MnO=97±4, n=5; zoned olivine: Fa14.8±3.5 (Fa10.4-20.1, FeO/MnO=93±19, n=10); low-Ca pyroxene: Fs9.7±0.1Wo4.2±0.1, FeO/MnO=52±4, n=10); low-Ca pyroxene host to exsolution lamellae: Fs50.0±0.3Wo2.4±0.2 (Fs49.8-50.5Wo2.2-2.7, FeO/MnO=60±3, n=7); Ca-pyroxene exsolution lamellae: Fs6.4±0.1Wo42.5±0.2 (Fs6.2-6.6Wo42.4-43.0, FeO/MnO=36±8, n=7); calcic plagioclase: An95.9±0.5 (An95.1-96.9, n=10); spinel: Cr#3.5±0.1, Mg#85.7±1.3, n=10.
Classification: Lunar feldspathic breccia.
Specimens: 5.2 g at MNB. Main mass with Salamu Ali.
I have not studied Northwest Africa 15800.
Meteoritical Bulletin Database