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Northwest Africa 8773
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:help 2 kg
Classification
  history:
Meteoritical Bulletin:  MB 104  (2015)  L3
MB 109  (2021)  LL3
Recommended:  LL3    [explanation]

This is 1 of 508 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
Writeuphelp
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:
Place of purchase:Zagora
Date:P 2014 Apr
Mass (g):2002
Pieces:many
Class:L3
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):4.2-39.0
Ferrosilite (mol%):2.9-32.9
Wollastonite (mol%):0.2-1.3
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):27.8
Type spec location:UWB
Main mass:S. Vasiliev
Comments:SV17; submitted by A. Irving
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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
FSU: Department of Geological Sciences, Florida State University, Tallahassee FL 32306-4100, United States (institutional address; updated 16 Dec 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
Published in Gattacceca J., McCubbin F. M., Grossman J., Bouvier A., Bullock E., Chennaoui Aoudjehane H., Debaille V., D’Orazio M., Komatsu M., Miao B. and Schrader D. L. (2021) The Meteoritical Bulletin, No. 109. Meteoritics & Planetary Science 56, 1626–1630.
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9933 approved meteorites from (Northwest Africa) (plus 1837 unapproved names)

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