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Northwest Africa 8343 | |||||||||||||||||||||
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Basic information | Name: Northwest Africa 8343 This is an OFFICIAL meteorite name. Abbreviation: NWA 8343 Observed fall: No Year found: 2013 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||
Classification history: |
This is 1 of 453 approved meteorites classified as Howardite. [show all] Search for other: Achondrites, HED achondrites, and Howardites | ||||||||||||||||||||
Comments: | Approved 27 Apr 2014 | ||||||||||||||||||||
Writeup![]() |
Writeup from MB 103:
Northwest Africa 8343 (NWA 8343) (Northwest Africa) Purchased: 2013 Classification: HED achondrite (Howardite) History: Purchased by Brahim Tahiri from a Moroccan hunter and sent to his partner Sean Tutorow for classification, 2013. Physical characteristics: Four stones with identical appearance (338.70 g, 192.18 g, 96.79 g, 73.25 g), irregular dark brown weathered exterior. Saw cut reveals breccia with white, green, and dark gray clasts. Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows a fragmental to cataclastic breccia with equilibrated (exsolution lamellae) and unequilibrated (igneous zoned) pyroxenes throughout. Silica, ilmenite, chromite, and iron-nickel metal present. Approximately 30% of this meteorite is diogenitic, ~60% is basaltic eucrite, and ~10% is cumulate eucrite. Geochemistry: (C. Agee and N. Muttik, UNM) Diogenite minerals: low-Ca pyroxene Fs29.5±5.2Wo3.6±1.3, Fe/Mn=30±3, n=4; olivine Fa33.5, Fe/Mn=61, n=1; plagioclase An93.2±0.7Ab6.5±0.6Or0.3±0.1, n=3. Basaltic eucrite minerals: low-Ca pyroxene Fs55.3±2.7Wo8.1±2.9, Fe/Mn=32±0, n=9; augite Fs39.1±1.2Wo39.8±0.5, Fe/Mn=33±1, n=2, olivine Fa77.4, Fe/Mn=41, n=1; plagioclase An88.4±2.2Ab11.1±2.2Or0.5±0.0, n=2. Cumulate eucrite minerals: low-Ca pyroxene Fs37.9.3±2.2Wo5.0±2.0, Fe/Mn=30±1, n=3; plagioclase An91.5±0.3Ab8.0±0.3Or0.5±0.1, n=2. Classification: Achondrite (howardite) Specimens: 22.5 g including a probe mount on deposit at UNM, Sean Tutorow holds the main mass. | ||||||||||||||||||||
Data from: MB103 Table 0 Line 0: |
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Institutions and collections |
UNM: Institute of Meteoritics
MSC03 2050
University of New Mexico
Albuquerque NM 87131-1126
USA, United States; Website (institutional address; updated 12 Feb 2015) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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Geography: |
Statistics: This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names) |