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Northwest Africa 8732 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 8732 This is an OFFICIAL meteorite name. Abbreviation: NWA 8732 Observed fall: No Year found: 2014 Country: (Northwest Africa) Mass: 357 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 11 approved meteorites classified as Acapulcoite/Lodranite. [show all] Search for other: Acapulcoite-lodranite family, Primitive achondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 4 Feb 2015 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 104:
Northwest Africa 8732 (NWA 8732) (Northwest Africa) Found: 2014 Classification: Primitive achondrite (Acapulcoite/Lodranite) History: Recovered in April 2014 near the borders of Mauritania, Western Sahara and Algeria. Purchased in Mauritania in June 2014. Physical characteristics: A single stone with weathered exterior. A saw cut reveals a mixture of coarse-grained light colored (>1 mm), but also fine grained material, metal and oxidized metal. Petrography: (C. Agee, UNM) Microprobe examination of the deposit sample, shows a brecciated texture with highly variable pyroxene and olivine grain size. Plagioclase makes up approximately 10-20% of this meteorite. Accessory phases include Fe-Ni metal, iron oxide, and chromite. Geochemistry: (C. Agee and N. Muttik, UNM). olivine Fa13.2±0.1, Fe/Mn=25±1, n=12; low-Ca pyroxene Fs11.4±0.6Wo1.5±0.5, Fe/Mn=15±0, n=8; diopside Fs5.2±1.3Wo44.5±1.6, Fe/Mn=12±2, Cr2O3=0.69±0.09 (wt%), n=4; oligoclase plagioclase An15.7±3.0Ab81.3±2.7Or3.0±0.4, n=6; andesine plagioclase An49.4Ab49.7Or1.0, n=1. Classification: Primitive achondrite, transitional between acapulcoite and lodranite. Some domains contain coarse pyroxene crystals >1 mm (lodranite-like) whereas other domains are fine grained ~100-300 μm (acapulcoite-like); also there is a significant amount of plagioclase present indicative of acapulcoite (Goodrich et al., 2010), moderate weathering grade, high shock stage. Specimens: A total of 22 g including a probe mount on deposit at UNM. DPitt holds the main mass. | ||||||||||||||||||||||||||||||
Bibliography: |
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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 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names) | ||||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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