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Northwest Africa 12566
Basic information Name: Northwest Africa 12566
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12566
Observed fall: No
Year found: 2018
Country: Mauritania
Mass:help 2.9 kg
Meteoritical Bulletin:  MB 108  (2020)  Mesosiderite-C3
Recommended:  Mesosiderite-C3    [explanation]

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 from MB 108:

Northwest Africa 12566 (NWA 12566)


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:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2018
Mass (g):2900
Shock stage:low
Weathering grade:low
Fayalite (mol%):14.1±0.3
Ferrosilite (mol%):12.7±0.2, 5.6±0.1
Wollastonite (mol%):3.0±0.2, 44.0±0.2
Classifier:C. Agee, UNM
Type spec mass (g):24
Type spec location:UNM
Main mass:Didi Baidari
Comments:Submitted by C. Agee
Plots: O isotopes:  
   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)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 221 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters)

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