Northwest Africa 4881 Description (excerpt from Meteoritical Bulletin):
Lunar Granulitic Breccia
Found in 2005 and purchased from a dealer in Ouarzazate, Morocco. Physical characteristics: A single, broken, irregular conical stone (606 g) partially covered by translucent, pale greenish fusion crust and with a pale grey-brown interior. Petrography: (A. Irving and S. Kuehner, UWS) Fine grained recrystallized breccia composed of larger plagioclase grains (converted partially to maskelynite) poikilitically enclosing very small grains (mostly 30-80 microns) of low-Ca pyroxenes, olivine, Ti-chromite, ilmenite, troilite and metal. Mineral compositions and geochemistry: Olivine (Fa40.4-58.8, FeO/MnO = 91-100), plagioclase (An96.1-98Or<0.1), pigeonite (Fs32.0-64.5Wo9.5-13.1, FeO/MnO = 51.1-62). Classification: Achondrite (lunar, granulitic breccia). This stone is paired with Northwest Africa 3163 (Irving et al., 2006) and Northwest Africa 4483; in combination these specimens evidently represent naturally broken pieces from a crusted lunar meteorite weighing at least 2448 g. Specimens: A total of 20 g of sample and one polished mount are on deposit at UWS. Submitted by: A. Irving, UWS.
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