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NWA 011, NWA 2976, NWA 2400
NWA 2976 (Ungrouped Achondrite)
History: A complete 219 g stone with no crust was purchased in Erfoud, Morocco in November 2005. Petrography: (T. Bunch and J. Wittke, NAU) Contains mm-sized pigeonite with exsolved augite lamellae surrounded by recrystallized plagioclase and minor amounts of relict plagioclase of similar composition. Geochemistry: Pigeonite (Fs64.8Wo6.1), FeO/MnO = 64; Augite (Fs44.2 Wo27.3); Plagioclase (An84.0 86.8). Abundant chromite is observed. The sample also contains minor amounts of Zn-bearing FeS, Cr-ulvöspinel, silica and phosphate. Classification: Achondrite (Ungrouped).
This meteorite is paired with NWA 2400 and NWA 011. Although no oxygen isotopic data has yet been obtained, the petrography is essentially identical to these two meteorites. Shock effects are minimal and internal weathering is very low. Specimens: A 23.2 g sample is on deposit at NAU.