Northwest Africa 2914
Find: April 2005
Achondrite (eucrite, monomict breccia)
History: Three paired partial stones weighing a total of 399 g were purchased in Erfoud, Morocco, in April 2005.
Petrography: (T. Bunch and J. Wittke, NAU) Cataclastic cumulate basalt that shows a remarkable range of shock features that include alternating bands of cataclastic and melt flows, mylonite-like swirls and lenticular masses, and rounded, finely crushed breccia clasts that are separated by dark, glassy to cryptocrystalline bands.
Geochemistry: Host: orthopyroxene (Fs59.3-62.7Wo3.1-1.9; FeO/MnO = 31), exsolved augite (Fs26.8-27.8Wo43-42.1; FeO/ MnO = 28), plagioclase (An92); chromite (Cr/(Cr+Al) = 0.88). Classification: Achondrite (eucrite monomict breccia) with moderate to high degree of shock and low degree of weathering.
Specimens: A 21.1 g type specimen is on deposit at NAU.
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