0.2g fragment. Sold in a collection box with label/certificate of authenticity
Northwest Africa 12671 (NWA 12671)
Classification: Carbonaceous chondrite (CK6)
History: The meteorite was purchased from a local meteorite dealer in Laayoune, Mauritania.
Physical characteristics: Many small dark greyish fragments some of which are partly covered with fusion crust.
Petrography: The meteorite displays a dark-grayish interior and predominantly consists of fine-grained recrystallized matrix dominated by ferrous olivine. Chondrules are only rarely encountered. Minor phases include intermediate plagioclase, low-Ca pyroxene, Ca-pyroxene, and FeNi-sulfides. Cr-rich magnetite is abundant; metal is virtually absent.
Geochemistry: olivine: Fa28.7±0.2 (FeO/MnO=100±10, n=11); low-Ca pyroxene: Fs26.8±0.9Wo0.5±0.1, n=12; Ca-pyroxene: Fs8.4±0.3Wo46.2±0.3, n=15