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Northwest Africa 13673 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 13673 This is an OFFICIAL meteorite name. Abbreviation: NWA 13673 Observed fall: No Year found: 2020 Country: (Northwest Africa) Mass: 334 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 4 approved meteorites classified as Achondrite (brachinite-like). [show all] Search for other: Primitive achondrites, Ungrouped achondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 19 Mar 2022 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 111:
Northwest Africa 13673 (NWA 13673) (Northwest Africa) Purchased: 2020 Sep Classification: Achondrite (brachinite-like) History: Purchased by Habib Naji in September 2020 from a dealer in Laayoune, Morocco. Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Protogranular aggregate (mean grainsize ~0.5 mm) of predominantly olivine and low-Ca pyroxene together with subordinate augite plus accessory kamacite, troilite, low-Ti chromite, merrillite, chlorapatite and minor secondary calcite. Small orthopyroxene+kamacite symplectitic intergrowths (up to 60 µm across) occur throughout the specimen. No plagioclase was found. Geochemistry: Olivine (Fa23.3-24.2, FeO/MnO = 42-48, N = 5), low-Ca pyroxene (Fs22.6-23.0Wo2.0-2.1, FeO/MnO = 31-35, N = 5), augite (Fs8.9-9.2Wo44.1-43.9, FeO/MnO = 24-26, N = 2).Oxygen isotopes (K. Ziegler, UNM); analyses of acid-washed subsamples by laser fluorination gave, respectively, δ17O 2.545, 2.444, 2.535; δ18O 5.390, 5.200, 5.382; Δ17O -0.301, -0.302, -0.307 per mil (all data linearized). Classification: Achondrite (ultramafic, brachinite-like). Brachinite-like achondrites are more magnesian, and have more opx (vs. augite)than brachinites. The olivine composition (Fa and Fe/Mn), and opx/augite abundances also support brachinite-like rather than brachinite. See Day et al. (2012) and Goodrich et al. (2017). Specimens: 23 g including one polished thin section at UWB; remainder with Mr. H. Naji. | ||||||||||||||||||||||||||||||
Bibliography: |
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Data from: MB111 Table 0 Line 0: |
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Plots: | O isotopes: | ||||||||||||||||||||||||||||||
Institutions and collections |
UNM: Institute of Meteoritics
MSC03 2050
University of New Mexico
Albuquerque NM 87131-1126
USA, United States; Website (institutional address; updated 12 Feb 2015) 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 Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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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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