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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
Recommended:  LL3    [explanation]

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
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, 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)
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 Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Sergey Vasiliev   
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Russ Opdahl   
Solar Anamnesis      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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