INCREDIBLE NWA 2914 EUCRITE MONOMICT BRECCIA w/ OCEANS OF OLIVE GREEN MELT!
Exceptional 38.7g NWA 2914 EUCRITE MONOMICT BRECCIA w/ OCEANS OF OLIVE GREEN SHOCK MELT, CLASTS & VESICLES!
This is an extrordinary NEW eucrite composed of an incredible Olive Green Melt filled with Breccia and VESICLES! This may be one of the most intersting eucrites to have been found in recent years. It has an extremely low TKW of only 399 grams, and in the words of the classifying Scientist is composed of "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."
This specimen was too nice to cut up into little pieces. After cutting a specimen for Scientific Study we cut this meteorite into two more pieces. At 38.7 grams, this is the largest of the two specimens. The majority of this specimen consists of a spectacular olive green pool of shock melt which was probably formed by a catastrophic asteroid impact on the parent body. The melt is filled with the most amazing breccia and vesicles! One really must see this meteorite under a 10x loop to appreciate its beauty. Interestingly, this specimen of NWA 2914 was from just one of three extremely heterogenious specimens that comprise the NWA 2914 meteorite grouping. We will be offering specimens from the other two members of this highly heterogenious meteorite in the coming weeks so please check back.
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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