INCREDIBLE NWA 2914 EUCRITE with MELT FLOWS, FILLED WITH VESICLES & BRECCIA!
This is an incredible, NEW Monomict Eucrite Breccia w/ Melt Flows! NWA 2914 has a low TKW of only 399 grams, and consists of three highly heterogenious stones! The first stone consists of an ocean of olive green shock melt filled with vesicles and breccia. The second stone is denser, and has dark grey melt surrounding clasts having an orange tint. The third stone consists of a conglomeration of light colored breccia. These three stones were so different in appearance that samples from all three were submitted for analysis and surprisingly, they were all determined to be the same meteorite, NWA 2914! This is certainly one of the most unusual Eucrites to have been found in recent years!
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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