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Northwest Africa 8733 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 8733 This is an OFFICIAL meteorite name. Abbreviation: NWA 8733 Observed fall: No Year found: 2014 Country: (Northwest Africa) Mass: 51 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 3 approved meteorites classified as Lunar (bas/anor). [show all] Search for other: Lunar meteorites | ||||||||||||||||||||||||||||||
Comments: | Approved 4 Feb 2015 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 104:
Northwest Africa 8733 (NWA 8733) (Northwest Africa) Found: 2014 Classification: Lunar meteorite (basalt/anorthosite) History: Recovered in April 2014 near the borders of Mauritania, Western Sahara and Algeria. Purchased in Mauritania in June 2014. Physical characteristics: Six similar stones with irregular dark exteriors. Saw cuts on two of the stones reveal identical textures: a few white plagioclase grains and lithic clasts, set in a dark-gray matrix, also some bright metallic grains up to 1 mm. Petrography: (C. Agee, UNM) Microprobe examination polished mount shows a polymict breccia with numerous fragmental olivine, pyroxene, and plagioclase crystals; anorthositic and basaltic clasts throughout. Accessory Fe-metal, ilmenite, chromite, silica, and troilite. Calcite weathering products detected. Geochemistry: (C. Agee and N. Muttik, UNM). Olivine Fa35.0±10.4, Fe/Mn=96±9, range Fa17.9-64.0, n=22; clinopyroxene Fs36.4±11.1Wo17.0±7.5, Fe/Mn=57±6, range Fs22.3Wo5.6-Fs56.6Wo29.0, n=18; plagioclase An95.0±1.4Ab4.5±1.3Or0.4±0.2, n=7. Shock melt (proxy for bulk composition) SiO2=44.0±1.1, TiO2=0.37±0.10, Al2O3=25.1±4.3, Cr2O3=0.20±0.12, MgO=7.9±1.7, FeO=7.3±3.0, MnO=0.09±0.04, NiO=0.01±0.01, CaO=14.5±1.6, Na2O=0.28±0.27, K2O=0.08±0.03 (wt%), n=3. Classification: Achondrite (lunar basaltic/anorthositic breccia), moderate weathering grade, high shock stage. Specimens: A total of 10.5 g including a probe mount on deposit at UNM. DPitt holds the main mass. | ||||||||||||||||||||||||||||||
Data from: MB104 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) DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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Geography: |
Statistics: This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names) | ||||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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