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Northwest Africa 13457 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 13457 This is an OFFICIAL meteorite name. Abbreviation: NWA 13457 Observed fall: No Year found: 2020 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 587 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 28 Nov 2020 | ||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 109:
Northwest Africa 13457 (NWA 13457) (Northwest Africa) Purchased: June, 2020 Classification: HED achondrite (Eucrite) History: The meteorite was purchased from a local meteorite dealer in Algeria. Physical characteristics: Light-brownish rock without fusion crust. Petrography: The meteorite is an unbrecciated coarse-grained achondrite of dominantly up to 1 mm sized exsolved pyroxene and calcic plagioclase grains. Low-Ca pyroxene contains both, sub-micrometer sized and up to 200 µm wide augite exsolution lamellae. Minor phases are silica, chromite, FeS, and FeNi metal. Geochemistry: low-Ca pyroxene: Fs52.0±0.6Wo7.1±0.7 (Fs51.3-53.1Wo6.2-8.1, n=12, FeO/MnO=27-29); Ca-pyroxene: Fs26.2±0.2Wo40.8±0.1 (Fs25.9-26.5Wo40.6-41.0, n=13, FeO/MnO=24-29); calcic plagioclase: An92.1±0.6 (An91.0-93.1, n=13); Oxygen isotopes (K. Ziegler, UNM): 3 acid-washed fragments analyzed by laser fluorination gave: δ18O=3.657, 4.125, 3.787; δ17O=1.655, 1.875, 1.717; Δ17O= -0.276, -0.303, -0.283 (all per mil) Classification: Achondrite (eucrite). | ||||||||||||||||||||||||||||||
Data from: MB109 Table 0 Line 0: |
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Plots: | O isotopes: | ||||||||||||||||||||||||||||||
Institutions and collections |
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011) UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Photos: |
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Geography: |
Statistics: This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names) |