Northwest Africa 2913
Achondrite (Eucrite, Monomict Melt Breccia)
History: A 100.2 g complete stone was purchased in Erfoud, Morocco, in May 2005.
Petrography: (J. Wittke and T. Bunch, NAU) Specimen contains medium-grained (<2 mm), centimeter-size, cumulate basalt clasts set in a microbreccia melt matrix. Clasts are moderately shocked with partial maskelynization of plagioclase and mechanical twinning, optical mosaicism and reduced birefringence in pyroxenes. The dark matrix is a flow mixture of FeO-rich glasses, very small cumulate basalt fragments, and patches of quench-textured microbasalt.
Geochemistry: Monomict cumulate basalt: host Ca-poor pyroxene (Fs55.4-57.8Wo5.1-2.9), FeO/MnO = 28; exsolved augite (Fs24.2Wo44.7), FeO/MnO = 36; plagioclase/ maskelynite (An90.8); chromite Cr/(Cr+Al) = 0.86.
Classification: Achondrite (eucrite, monomict melt breccia); moderate shock, minimal weathering.
Specimens: A 21 g type specimen is deposited at NAU.
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