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Northwest Africa 12646 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12646 This is an OFFICIAL meteorite name. Abbreviation: NWA 12646 Observed fall: No Year found: 2019 Country: (Northwest Africa) Mass: 7.26 kg | ||||||||||||||||||||||||||||||
Classification history: |
This is the only approved meteorite classified as LL4-7 melt breccia. Search for other: LL chondrites, LL chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||||||||
Comments: | Approved 9 Aug 2019 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 108:
Northwest Africa 12646 (NWA 12646) (Northwest Africa) Purchased: 2019 Jan Classification: LL4-7 melt breccia History: Purchased by Bob Falls in January 2019 from a Moroccan dealer. Petrography: (A. Irving, UWS and P. Carpenter, WUSL) The specimen is a breccia composed of clasts of relatively unshocked material (which is itself a breccia) within a much darker melt matrix. The unshocked breccia clasts contain a variety of equilibrated components with a range of textures from type 4 (with well-formed chondrules) to type 7 (recrystallized with no remnant chondrules). The melt matrix is very fine grained and contains numerous small grains of metal and sulfide. Geochemistry: Type 4 clast: Olivine (Fa30.6), low-Ca pyroxene (Fs25.0Wo2.4), augite (Fs9.0Wo44.4). Type 7 clast: Olivine (Fa30.6-30.9, N =3), orthopyroxene (Fs24.7-24.9Wo3.2-3.9, N = 3), augite (Fs10.7Wo43.2), plagioclase (An7.7-14.0Or2.5-5.1, N = 2). Melt matrix: Olivine (Fa30.8-31.2, N = 2), orthopyroxene (Fs25.2-25.5Wo1.9-1.4, N = 2). Classification: Ordinary chondrite (LL4-7 melt breccia). Specimens: 103.6 g including one polished thin section at UWB; remainder with Mr. R. Falls. | ||||||||||||||||||||||||||||||
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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023) |
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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 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names) | ||||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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