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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
Classification
  history:
Recommended:  Lunar (bas. breccia)    [explanation]

This is 1 of 18 approved meteorites classified as Lunar (bas. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 29 May 2021
Writeuphelp
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:
  MB110
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2019 Mar
Mass (g):190
Pieces:2
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
Institutions
   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, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8495 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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