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Northwest Africa 12691 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12691 This is an OFFICIAL meteorite name. Abbreviation: NWA 12691 Observed fall: No Year found: 2017 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 276 approved meteorites classified as Lunar (feldsp. breccia). [show all] Search for other: Lunar meteorites | ||||||||||||||||||||||||||||||
Comments: | Approved 31 Aug 2019 | ||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 108:
Northwest Africa 12691 (NWA 12691) (Northwest Africa) Find: 2017 Jan Classification: Lunar meteorite (feldspathic breccia) History: Scores of specimens (total weight 103.770 kg) were found in January 2017 in Western Sahara or the Western Sahara/Algeria border region, and purchased by Darryl Pitt in February 2017 from a Mauritanian dealer. The largest specimens weigh 15.555 kg, 15.435 kg, 13.650 kg, 12.480 kg, 8.960 kg and 3.460 kg; nine specimens weigh between 1-4 kg, 31 specimens weigh between 100-500 g, and there are numerous smaller fragments. Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia composed of angular mineral clasts of anorthite, olivine, pigeonite, subcalcic augite, chromite and ilmenite, together with some quench-textured lithic clasts, set in a sparsely vesicular, parly vitreous matrix containing minor troilite, kamacite and taenite. Geochemistry: Olivine (Fa21.5-47.7, FeO/MnO = 87-102, N = 4), pigeonite (Fs38.5-43.0Wo7.1-5.3, FeO/MnO = 57-58, N = 2), subcalcic augite (Fs38.4Wo24.0, FeO/MnO = 53), plagioclase (An96.7Or0.1). Classification: Lunar (feldspathic breccia). Specimens: 20.3 g including four polished endcuts from separate stones at UWB; remainder with DPitt. | ||||||||||||||||||||||||||||||
Data from: MB108 Table 0 Line 0: |
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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) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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Geography: |
Statistics: This is 1 of 8509 approved meteorites from (Northwest Africa) (plus 1899 unapproved names) |