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Northwest Africa 12758 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12758 This is an OFFICIAL meteorite name. Abbreviation: NWA 12758 Observed fall: No Year found: 2019 Country: Mali Mass: 2.4 kg | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 142 approved meteorites classified as Achondrite-ung. [show all] Search for other: Achondrites, Ungrouped achondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 3 Sep 2019 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 108:
Northwest Africa 12758 (NWA 12758) Mali Purchased: 2019 Jan Classification: Ungrouped achondrite History: Purportedly found in Mali and purchased in Agadir, Morocco, by Aziz Habibi in January 2019. Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Protogranular aggregate (mean grainsize 0.8 mm) of predominantly low-Ca pyroxene (~70 vol.%) and magnesian olivine (~30 vol.%) with accessory Si-bearing kamacite and Cr-bearing troilite. Plagioclase is absent. Minor secondary Fe hydroxides coat grain boundaries. Geochemistry: Low-Ca pyroxene (Fs5.9-6.0Wo4.7-4.9, FeO/MnO = 20-22, N = 3), olivine (Fa6.5-6.9, FeO/MnO = 29-39, N = 4), metal (Ni = 6.5 wt.%, Si = 1.1 wt.%). Oxygen isotopes (K. Ziegler, UNM); analyses of acid-washed subsamples by laser fluorination gave, respectively, δ17O -1.168, -1.115, -1.099; δ18O 1.422, 1.429, 1.557; Δ17O -1.918, -1.869, -1.921 per mil. Classification: Achondrite (ungrouped, ultramafic). Specimens: 22.7 g including one polished thin section at UWB; remainder with A. Habibi. | ||||||||||||||||||||||||||||||
Data from: MB108 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 Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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Geography: |
Statistics: This is 1 of 111 approved meteorites from Mali (plus 2 unapproved names) | ||||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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