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Northwest Africa 12566 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12566 This is an OFFICIAL meteorite name. Abbreviation: NWA 12566 Observed fall: No Year found: 2018 Country: Mauritania Mass: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 2 approved meteorites classified as Mesosiderite-C3. [show all] Search for other: Class C mesosiderites, Mesosiderites, and Metal-rich meteorites | ||||||||||||||||||||||||||||||
Comments: | Approved 22 Apr 2019 | ||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 108:
Northwest Africa 12566 (NWA 12566) Mauritania Purchased: 2018 Classification: Mesosiderite-C3 History: Reportedly found in Mauritania near Zouérat. Physical characteristics: Single stone with dark fusion crust. Saw cut reveals an approximately equal mix of metal and silicate grains and clasts. Some metal and silicate grains are up to ~3 mm in size. Petrography: (C. Agee, UNM) Microprobe examination of a polished mount detected primarily pyroxene and olivine; with minor amounts of plagioclase, Cr-rich spinel, and troilite. Metal consists of kamacite and taenite. No significant brecciation observed. Geochemistry: (C. Agee, UNM) Olivine Fa14.1±0.3, Fe/Mn=40±2, n=11; low-Ca pyroxene Fs12.7±0.2Wo3.0±0.2, Fe/Mn=24±2, n=10; high-Ca pyroxene Fs5.6±0.1Wo44.0±0.2, Fe/Mn=17±1, n=2; plagioclase An83.3±0.7Ab16.0±0.7Or0.6±0.1, n=3; kamacite Fe=91.9±1.6, Ni=8.0±1.8 (wt%), n=4; taenite Fe=66.3, Ni=33.7 (wt%), n=1. Oxygen isotopes (K. Ziegler, UNM): 2 acid-washed fragments analyzed by laser fluorination gave δ18O= 3.209, 3.132; δ17O= 1.478, 1.425; Δ17O=-0.216, -0.229 (linearized, all per mil, TFL slope=0.528). Classification: Mesosiderite-C3. Presence of olivine and only minor amounts of plagioclase is consistent with group C. Segregated metal, presence of some texturally and chemically equilibrated silicates, and absence of brecciation consistent with type 3. Specimens: 24 g including a probe mount on deposit at UNM, Didi Badari holds the main mass. | ||||||||||||||||||||||||||||||
Data from: MB108 Table 0 Line 0: |
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Plots: | O isotopes: | ||||||||||||||||||||||||||||||
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. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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Geography:![]() |
Statistics: This is 1 of 212 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters) |