Lunar Meteorite: Northeast Africa 075
from The Meteoritical Bulletin, No. 114 Northeast Africa 075 (NEA 075)Sudan Lunar meteorite (fragmenta breccia) Physical Characteristics: Gray stone with diverse lithic and monomineralic clasts measuring <1.5 cm visible on the cut surface. The stone is heavily fractured and no fusion crust is seen on the type specimen. Petrography: (J. T. Mitchell, UMinn) Fragmental breccia composed of angular to sub-angular clasts (<14.5 mm, typically ~4 mm) of multiple lithologies including basalt, anorthosite, and granoblastic material, and mineral fragments of varying sizes which include feldspar, zoned/exsolved pyroxene, and lesser amounts of olivine. Accessory iron sulfide and ilmenite is observed. The matrix is composed of small amounts of melt and is dominated by fine dust and fragments. The sample is somewhat fractured but displays minimal terrestrial weathering infill. Geochemistry: Plagioclase An89.7-96.0Or0.1-0.4, mean An92.3±1.9Or0.2±0.1 (n=18). Olivine Fa25.6-26.8, mean Fa26.2±0.5, Fe/Mn 92.8 (n=6). Low-Ca pyroxene Fs27.6-64.4Wo1.9-22.0, mean Fs39.6±15.4Wo12.9±5.7 Fe/Mn 62.8±10.5 (n=11). High-Ca pyroxene Fs22.6-50.4Wo32.5-40.1, mean Fs32.7±15.4Wo36.5±3.8, Fe/Mn 89.6 (n=5). Classification: Lunar meteorite (fragmenta breccia). Specimens: 7.6 g at UMinn; main mass with Craig Zlimen. |
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More InformationMeteoritical Bulletin Database NEA 075 |