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Northwest Africa 8773 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 8773 This is an OFFICIAL meteorite name. Abbreviation: NWA 8773 Observed fall: No Year found: 2014 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 462 approved meteorites classified as LL3. [show all] Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3) | ||||||||||||||||||||||||||||||
Comments: |
Approved 29 Jan 2015 Revised 7 Oct 2020: reclassified as LL | ||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 104:
Northwest Africa 8773 (NWA 8773) (Northwest Africa) Purchased: 2014 Apr Classification: Ordinary chondrite (L3) History: Purchased by Sergey Vasiliev in April 2014 from a dealer in Zagora, Morocco. Petrography: (A. Irving and S. Kuehner, UWS) Closely packed, round chondrules (1.3±0.7 mm) occur within a finer matrix containing stained metal. Geochemistry: Olivine, Fa4.2-39.0; Cr2O3 in ferroan examples = 0.06-0.15 wt.% Cr2O3, mean 0.09±0.03 wt.%, N = 8; orthopyroxene, Fs2.9-32.9Wo0.2-1.3, N = 3; subcalcic augite, Fs7.2-23.1Wo33.9-34.5, N = 2. Classification: Ordinary chondrite (L3). Specimens: 27.8 g including one polished thin section at UWB; main mass with Mr. S. Vasiliev. Writeup from MB 109: Northwest Africa 8773 (NWA 8773) Reclassification: (D. Sheikh, FSU) NWA 8773 has a magnetic susceptibility of the log χ (× 10-9 m3/kg) = 3.80. Oxygen isotopes (K. Ziegler, UNM), analyses of 5 acid-washed subsamples by laser fluorination gave, δ17O 3.953, 3.745, 4.087, 4.084, 4.458; δ18O 5.927, 5.316, 6.154, 5.985, 5.869; Δ17O 0.824, 0.938, 0.837, 0.924, 1.359 per mil. The mean observed chondrule size in the sample is 1.1±0.6 mm (n=22). The combination of these data favor a reclassification from L3 to LL3. | ||||||||||||||||||||||||||||||
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) FSU: Department of Geological Sciences, Florida State University, Tallahassee FL 32306-4100, United States (institutional address; updated 16 Dec 2010) |
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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 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) |