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Northwest Africa 13951
Basic information Name: Northwest Africa 13951
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13951
Observed fall: No
Year found: 2021
Country: Mauritania
Mass:help 4.3 kg
Meteoritical Bulletin:  MB 110  (2022)  Lunar (feldsp. breccia)
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 341 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 29 May 2021
Writeup from MB 110:

Northwest Africa 13951 (NWA 13951)


Purchased: 2021

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased in January 2021 by Mark Lyon from a dealer in Mauritania.

Physical characteristics: Two identically appearing masses (2.5 and 1.8 kg) found together. Saw cut surface shows numerous clasts with gray and white grains, bounded by abundant darker gray melt veins. No fusion crust is present.

Petrography: (C. Agee, UNM) Electron microprobe analysis and imaging reveal a very fine-grained brecciated mix of plagioclase, pyroxene, olivine and melt. Numerous Fe-Ni metal grains are scattered throughout, some as large as 1 mm.

Geochemistry: (C. Agee, UNM) Plagioclase An96.5±1.7Ab4.0±1.7Or0.4±0.2, n=6; pigeonite Fs31.9±4.0Wo9.7±3.5, Fe/Mn=52±4, n=9; augite Fs14.9Wo38.2, Fe/Mn=49, n=1; subcalcic ferroaugite Fs45.4±2.6Wo29.5±5.2, Fe/Mn=59±1, n=3; olivine Fa34.3±6.3, Fe/Mn=96±9, n=13; metal Fe=93.4±2.0, Ni=6.6±1.7 wt%, n=4.

Classification: Lunar feldspathic breccia

Specimens: 21.5 g on deposit at UNM, Sean Mahoney and Juan Poblador hold the 2.5 kg mass, Paul Hoyt holds 740 g of the 1.8 kg mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2021
Mass (g):4.3 kg
Class:Lunar (feldsp. breccia)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):34.3±6.3
Ferrosilite (mol%):31.9±4.0, 45.4±2.6
Wollastonite (mol%):9.7±3.5, 29.5±5.2
Classifier:C. Agee, UNM
Type spec mass (g):21.5
Type spec location:UNM
Main mass:Sean Mahoney and Juan Poblador
Comments:Submitted by C. Agee
   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 Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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     This is 1 of 225 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters)

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