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Northwest Africa 11851
Basic information Name: Northwest Africa 11851
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11851
Observed fall: No
Year found: 2018
Country: Mali
Mass:help 227 g
Meteoritical Bulletin:  MB 107  (2018)  Lunar (feldsp. breccia)
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 334 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 4 Jul 2018
Writeup from MB 107:

Northwest Africa 11851 (NWA 11851)


Purchased: 2018 Mar

Classification: Lunar meteorite (feldspathic breccia)

History: Found in the Azawad region of northern Mali and purchased by Habib Naji in March 2018.

Physical characteristics: A fine grained, medium gray stone (227 g) with macroscopically indistinct clasts; partly coated by light brown weathering products.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Polymict breccia consisting of small mineral clasts (anorthite, olivine, pigeonite, augite, orthopyroxene, ilmenite, Ti-Cr-Mg-Al spinel, troilite, merrillite, kamacite) and small lithic clasts (including gabbroic lithologies and quench-textured melt rocks) in a finer grained matrix.

Geochemistry: Olivine (Fa17.8-23.5, FeO/MnO = 90-127, N = 3), orthopyroxene (Fs16.1Wo3.8, FeO/MnO = 53), pigeonite (Fs25.4-37.2Wo8.1-13.0, FeO/MnO = 54-60, N = 3), augite (Fs44.1Wo35.6, FeO/MnO = 62), plagioclase (An95.5-95.7Or0.5-0.3, N = 2).

Classification: Lunar (feldspathic breccia).

Specimens: 22 g including one polished thin section at UWB; remainder with Mr. H. Naji.

Data from:
  Table 0
  Line 0:
Place of purchase:Mali
Date:P 2018 Mar
Mass (g):227
Class:Lunar (feldsp. breccia)
Shock stage:moderate
Weathering grade:low
Fayalite (mol%):17.8-23.5
Ferrosilite (mol%):25.4-37.2
Wollastonite (mol%):8.1-13.0
Classifier:A. Irving & P. Carpenter
Type spec mass (g):22
Type spec location:UWB
Main mass:H. Naji
Comments:Work name HN-713; 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)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     This is 1 of 111 approved meteorites from Mali (plus 2 unapproved names)

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