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Northwest Africa 13964
Basic information Name: Northwest Africa 13964
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13964
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 6.5 kg
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 280 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 21 Jun 2021
Writeup from MB 110:

Northwest Africa 13964 (NWA 13964)

(Northwest Africa)

Purchased: 2021 Mar

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased by Craig Zlimen and Mark Lyon in March 2021 from an Algerian dealer. The main mass plus an additional piece were subsequently acquired by Alan Ginsberg.

Physical characteristics: Two similar-appearing pieces (4630 g, 1900 g) lacking fusion crust, which are naturally broken portions of a single meteorite stone. The material is composed of relatively large beige and light gray, angular clasts in a medium gray matrix.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Anorthositic breccia composed of >95 vol.% anorthitic plagioclase as both polymineralic lithic clasts (anorthosite, plagioclase-rich basalt) and mineral grains within a fine grained matrix. The most common mafic phase is olivine, but orthopyroxene, augite and pigeonite are also present, along with accessory Ti-chromite, troilite, rare armalcolite and minor secondary barite.

Geochemistry: Olivine (Fa23.2-33.3, FeO/MnO = 88-102, N = 4), low-Ca pyroxene (Fs28.6-35.8Wo2.0-3.5, FeO/MnO = 51-59, N = 3), pigeonite (Fs24.4-29.4Wo9.2-9.5, FeO/MnO = 44-48, N =2), augite (Fs11.9-20.1Wo38.9-43.8, FeO/MnO = 45-56, N = 2), anorthite (An95.9-96.8Or0.1±0.0, N = 3), armalcolite (Mg0.4Fe0.46Cr0.06Al0.07Ti1.97O5).

Classification: Lunar (anorthositic breccia).

Specimens: 26.1 g including one polished thin section at UWB; 4630 g stone plus a 441 g piece from the 1900 g stone with Mr. A. Ginsberg; remainder held jointly by Mr. C. Zlimen and Mr. M. Lyon.

Data from:
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2021 Mar
Mass (g):6500
Class:Lunar (feldsp. breccia)
Shock stage:low
Weathering grade:low
Fayalite (mol%):23.2-33.3
Ferrosilite (mol%):28.6-35.8; 24.4-29.4; 11.9-20.1
Wollastonite (mol%):2.0-3.5; 9.2-9.5; 38.9-43.8
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):26.1
Type spec location:UWB
Main mass:A. Ginsberg/C. Zlimen/M. Lyon
Comments:Work name ZLI035; 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, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Dirk Hohmann      
Robert Smart   
Ryan Upchurch   

     This is 1 of 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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