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Northwest Africa 13957
Basic information Name: Northwest Africa 13957
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13957
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 190 g
Meteoritical Bulletin:  MB 110  (2022)  Lunar (bas. breccia)
Recommended:  Lunar (bas. breccia)    [explanation]

This is 1 of 21 approved meteorites classified as Lunar (bas. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 29 May 2021
Writeup from MB 110:

Northwest Africa 13957 (NWA 13957)

(Northwest Africa)

Purchased: 2019 Mar

Classification: Lunar meteorite (basaltic breccia)

History: Purchased by Luc Labenne in March 2019 from a Moroccan dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia dominated by mafic lithic clasts (which are themselves breccias) in a sparse matrix of related crystalline debris. Typical feldspathic lunar lithologies appear to be absent. Minerals (mean grainsize ~0.1 mm) are anorthite, pigeonite, ferropigeonite, sub-calcic augite, olivine, rare low-Ca pyroxene, ilmenite and kamacite; glass is also present in both clasts and as separate angular fragments.

Geochemistry: Olivine (Fa25.0-49.3, FeO/MnO = 74-99, N = 4), low-Ca pyroxene (Fs39.9Wo2.2, FeO/MnO = 63), pigeonite (Fs26.8-80.1Wo8.4-19.8, FeO/MnO = 50-78, N = 3), subcalcic augite (Fs30.2Wo32.5, FeO/MnO = 51), anorthite (An93.4-97.7Or0.5-0.0, N = 4).

Classification: Lunar (basaltic breccia).

Specimens: 20.3 g in the form of a polished endcut at UWB; remainder with Mr. L. Labenne.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2019 Mar
Mass (g):190
Class:Lunar (bas. breccia)
Shock stage:low
Weathering grade:low
Fayalite (mol%):25.0-49.3
Ferrosilite (mol%):39.9; 26.8-80.1; 30.2
Wollastonite (mol%):2.2; 8.4-19.8; 32.5
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):20.3
Type spec location:UWB
Main mass:L. Labenne
Comments:Work name LAB21-7; submitted by A. Irving
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
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 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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