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Northwest Africa 13757
Basic information Name: Northwest Africa 13757
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13757
Observed fall: No
Year found: 2020
Country: Algeria
Mass:help 16.97 kg
Meteoritical Bulletin:  MB 110  (2022)  Lunar (melt breccia)
Recommended:  Lunar (melt breccia)    [explanation]

This is 1 of 28 approved meteorites classified as Lunar (melt breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 25 Apr 2021
Writeup from MB 110:

Northwest Africa 13757 (NWA 13757)


Purchased: 2020 Dec

Classification: Lunar meteorite (melt breccia)

History: Numerous stones (purportedly found at the same unspecified site in Algeria which produced NWA 13676) were purchased by Darryl Pitt in December 2020 from a dealer in Zagora, Morocco.

Physical characteristics: All of the stones (total weight 16974 g) are dark gray and relatively fine grained with an exterior shiny patina.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia composed of mineral clasts of anorthite, olivine, low-Ca pyroxene, pigeonite and augite plus mafic lithic clasts in a very fine grained matrix containing partially altered kamacite, both high-Ti and low-Ti chromite, and minor secondary barite and celestite. These specimens are richer in mafic components by comparison with typical feldspathic lunar breccias. Mafic lithic clasts include microgabbro, subophitic olivine-bearing mare basalt and quench-textured basalt lithologies. The matrix exhibits some fluidal alignment of elongate mineral clasts and is sparsely microvesicular.

Geochemistry: Olivine (Fa26.2-41.1, FeO/MnO = 81-92, N = 5), low-Ca pyroxene (Fs27.8Wo4.4, FeO/MnO = 60), pigeonite (Fs23.9-35.9Wo13.5-18.6, FeO/MnO = 43-52, N = 3), subcalcic augite (Fs43.6Wo32.4, FeO/MnO = 51), augite (Fs11.0Wo38.4, FeO/MnO = 41), anorthite (An93.8-96.6Or0.4-0.1, N = 3).

Classification: Lunar (melt breccia). This material has textural, petrologic and mineral chemical features consistent with being paired to the stone classified as NWA 13676, and was procured from the same Algerian source.

Specimens: 20.85 g in the form of a polished endcut at UWB; remainder with DPitt.

Data from:
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P 2020 Dec
Mass (g):16974
Class:Lunar (melt breccia)
Shock stage:high
Weathering grade:low
Fayalite (mol%):26.2-41.1
Ferrosilite (mol%):27.8; 23.9-35.9; 43.6; 11.0
Wollastonite (mol%):4.4; 13.5-18.6; 32.4; 38.4
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):20.85
Type spec location:UWB
Main mass:D. Pitt/S. Yousfi/A. Habibi
Comments:Work names MVCH 601; 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)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
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 from the Encyclopedia of Meteorites:
Sergey Vasiliev   
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Hao Wei Lin   
Said Yousfi   


     This is 1 of 1376 approved meteorites from Algeria (plus 31 unapproved names) (plus 4 impact craters)

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