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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
Classification
  history:
Recommended:  Lunar (melt breccia)    [explanation]

This is 1 of 5 approved meteorites classified as Lunar (melt breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 25 Apr 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13757 (NWA 13757)

Algeria

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:
  MB110
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P 2020 Dec
Mass (g):16974
Pieces:many
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
Finder:anonymous
Comments:Work names MVCH 601; 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)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
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Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1133 approved meteorites from Algeria (plus 27 unapproved names) (plus 4 impact craters)

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