Lunar Meteorite: Bir Ounane 005
| from The Meteoritical Bulletin, No. 113 Bir Ounane 005Gao, Mali Lunar meteorite History: Found in 2022 during a search of meteorites in the desert; later acquired by Jose Garcia in 2022. Physical Characteristics: Two pieces with minor fusion crust. Petrography: (D. Sheikh, Cascadia) Sample is a polymict breccia comprised of mm-sized lithic and mineral clasts/fragments, and impact glass spherules, set within a fine-grained matrix. Lithic clast lithologies identified include: anorthosites, basalts, impact melt clasts, noritic anorthosites, norites, and high-Fe clasts; mineral clast fragments of irregularly zoned pyroxenes, fayalitic olivine, pleonaste spinel, and silica are also present. Accessory phases identified include Ca-phosphates and troilite. Geochemistry: Olivine (Fa67.7±29.2, range Fa14.0-97.8, Fe/Mn=82±6, n=14), Pigeonite (Fs47.2±12.3Wo17.8±3.9, range Fs30.0-83.3Wo9.9-24.5, Fe/Mn=54±6, n=20), High-Ca Pyroxene (Fs35.7±11.8Wo33.2±4.9, range Fs11.8-55.2Wo25.2-41.1, Fe/Mn=53±8, n=16), Calcic Plagioclase (An94.3±2.2, range An90.0-97.1, n=21). Classification: Lunar Lunar (regolith breccia) due to its brecciated nature, clast diversity, and the presence of impact glass spherules. Specimens: 4.8 g at Cascadia, main mass and one thin section with Jose Garcia in MCM. |
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