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Northwest Africa 8123 | |||||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 8123 This is an OFFICIAL meteorite name. Abbreviation: NWA 8123 Observed fall: No Year found: 2013 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||||||
Classification history: |
This is the only approved meteorite classified as H(L)3.1. Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3) | ||||||||||||||||||||||||||||||||
Comments: | Approved 18 Dec 2015 | ||||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 104:
Northwest Africa 8123 (NWA 8123) (Northwest Africa) Purchased: 2013 Feb Classification: H(L)3.1 History: Purchased by Sergey Vasiliev and Marc Jost in February 2013 from a dealer in Erfoud, Morocco. Petrography: (A. Irving and S. Kuehner, UWS) Well-formed glass-bearing chondrules are set in a heavily stained, metal-bearing matrix. Geochemistry: Olivine (Fa0.3-97.1, N = 14; Cr2O3 in ferroan examples is 0.12-0.65 wt.%, mean 0.32±0.25 wt.%, N = 12), orthopyroxene (Fs2.0-12.7Wo0.5-3.8, N = 3), subcalcic augite (Fs4.7-24.0Wo35.4-32.8). Oxygen isotopes (K. Ziegler, UNM): analyses by laser fluorination of acid-washed subsamples gave, respectively δ17O 2.883, 2.644, 2.289; δ18O 4.494, 3.478, 3.942; Δ17O 0.510, 0.808, 0.208 per mil (for a TFL slope of 0.528). Magnetic susceptibility, log χ (× 10-9 m3/kg) = 4.02. Classification: Ordinary chondrite H(L)3.1. The wide range in olivine compositions and the distribution of Cr2O3 in ferroan olivine establish this specimen as a highly unequilibrated ordinary chondrite of Type 3.1, based on the scheme of Grossman and Brearley (2005). The relatively small average chondrule size and oxygen isotopes appear to establish affinity with H chondrites (despite some scatter in results for acid-washed subsamples of this relatively weathered specimen), but magnetic susceptibility is too low. Specimens: 24.7 g including one polished thin section at UWB. The remainder is held jointly by Mr. S. Vasiliev and Mr. M. Jost. | ||||||||||||||||||||||||||||||||
Bibliography: |
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Data from: MB104 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. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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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) |