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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 288 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 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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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 8745 approved meteorites from (Northwest Africa) (plus 1880 unapproved names)

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