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Northwest Africa 12628 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12628 This is an OFFICIAL meteorite name. Abbreviation: NWA 12628 Observed fall: No Year found: 2019 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 131 approved meteorites classified as Achondrite-ung. [show all] Search for other: Achondrites, Ungrouped achondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 20 Oct 2019 | ||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 108:
Northwest Africa 12628 (NWA 12628) (Northwest Africa) Purchased: 2019 Mar Classification: Ungrouped achondrite History: Purchased in March 2019 by Ke Zuokai from Moroccan dealer Habib Naji. Physical characteristics: A single fusion-crusted, beige-colored stone (73.5 g) found as seven broken fragments. Petrography: (A. Irving and S. Kuehner, UWS) Intersertal igneous texture. Composed predominantly of patchily zoned clinopyroxene (pigeonite and subcalcic augite) and sodic plagioclase with accessory fayalitic olivine, silica polymorph, ilmenite, Ti-chromite, troilite, Ni-free metal (no Ni detected in the EDS spectra), and rare phosphates (merrillite and chlorapatite). Several thin shock melt veinlets are present. Geochemistry: Pigeonite (Fs24.8-28.2Wo5.5-6.2, FeO/MnO=33-36, N=3), subcalcic augite (Fs23.2Wo25.6; Fs26.5Wo34.6; FeO/MnO=33-38; N = 2), fayalite (Fa84.9-85.3, FeO/MnO=59-64, N=2), plagioclase (Ab78.1-80.4An18.1-20.7Or1.2-1.5, N = 2). Oxygen isotopes (K. Ziegler, UNM): analysis of acid-washed subsamples by laser fluorination gave, respectively, δ17O 4.075, 4.298, 4.089; δ18O 5.427, 5.954, 5.452; Δ17O 1.210, 1.154, 1.210 per mil. Classification: Ungrouped igneous achondrite with isotopic affinities to LL chondrites. Specimens: 15.0 g including one polished thin section at UWB; remainder with Mr. K. Zuokai. | ||||||||||||||||||||||||||||||
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) UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012) |
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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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Photos: |
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Geography: |
Statistics: This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names) |