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Northwest Africa 13349 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 13349 This is an OFFICIAL meteorite name. Abbreviation: NWA 13349 Observed fall: No Year found: 2019 Country: (Northwest Africa) Mass: 2.1 kg | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 276 approved meteorites classified as Eucrite-mmict. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||
Comments: | Approved 7 Jul 2020 | ||||||||||||||||||||||||||||
Writeup |
Writeup from MB 109:
Northwest Africa 13349 (NWA 13349) (Northwest Africa) Purchased: 2019 Jul Classification: HED achondrite (Eucrite, monomict) History: Purchased by Habib Naji in July 2019 from a dealer in Zouerat, Mauritania. Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Monomict breccia composed of highly shocked gabbroic eucrite clasts and related crystalline debris set within a sparse fluidal, melt-textured matrix. Minerals are unexsolved pigeonite and anorthite together with accessory silica polymorph, Ti-chromite (with quite variable Ti and Al) and troilite (as fine inclusions within chromite). Pigeonite grains consist of myriad very small subgrains zoned from more magnesian cores to more ferroan rims. Plagioclase is birefringent but exhibits a variety of textures from undulose to polycrystalline to finely quenched. Geochemistry: Pigeonite (Fs40.1-45.2Wo4.0-11.5, FeO/MnO = 29-32, N = 3; Fs33.4Wo21.4, FeO/MnO = 29), ferroan low-Ca pyroxene (Fs56.3-57.5Wo3.9-4.9, FeO/MnO = 32-34, N = 2), augite (Fs17.0Wo45.2, FeO/MnO = 24), anorthite (An91.4-92.3Or0.2-0.3, N = 2). Classification: Eucrite (monomict breccia, gabbroic, highly shocked and partially melted). The prevalence of compositionally zoned, unexsolved and highly recrystallized pyroxenes in this specimen is an anomalous feature. Specimens: 36.8 g including one polished thin section at UWB; remainder with Mr. H. Naji. | ||||||||||||||||||||||||||||
Data from: MB109 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. 109, in preparation (2020)
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Geography: |
Statistics: This is 1 of 9589 approved meteorites from (Northwest Africa) (plus 1869 unapproved names) | ||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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