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Northwest Africa 8783
Basic information Name: Northwest Africa 8783
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8783
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 27.5 g
Classification
  history:
Meteoritical Bulletin:  MB 104  (2015)  Lunar (feldsp. breccia)
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 181 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 22 Feb 2015
Writeuphelp
Writeup from MB 104:

Northwest Africa 8783 (NWA 8783)

(Northwest Africa)

Purchased: 2014 Sep

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased by Gary Fujihara in September 2014 from a dealer in Zagora, Morocco.

Physical characteristics: A group of 24 small stones (total weight 27.5 g) lacking fusion crust and characterized by fairly closely packed, white clasts in a gray matrix.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of angular minerals clasts (anorthite, olivine, pigeonite, subcalcic augite, ilmenite, troilite, kamacite, rare baddeleyite) and sparse intersertal basalt clasts in a finer grained matrix containing minor barite. Vesicular glass veins are present in places.

Geochemistry: Olivine (Fa20.7-26.9, FeO/MnO = 89-93, N = 2), pigeonite (Fs19.9-23.8Wo6.6-5.0, FeO/MnO = 57-65; Fs47.1Wo10.6, FeO/MnO = 77; N = 3), subcalcic augite (Fs17.4Wo25.9, FeO/MnO = 77; Fs13.9-15.4Wo37.2-35.9, FeO/MnO = 56-63; N = 3), plagioclase (An94.6-96.2Or0.3, N = 2). Bulk composition (R. Korotev, WUSL) INAA of subsamples gave the following mean abundances (in wt.%) FeO 6.0, Na2O 0.56; (in ppm) Sc 10.3, La 17.2, Sm 7.8, Eu 1.03, Yb 5.3, Lu 0.72, Th 2.7.

Classification: Lunar (feldspathic breccia). Paired with NWA 8455.

Specimens: 5.5 g in the form of several stones polished on one side at UWB; Mr. G. Fujihara holds the remaining material.

Data from:
  MB104
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P 2014 Sep
Mass (g):27.5
Pieces:many
Class:Lunar (feldsp. breccia)
Shock stage:low
Weathering grade:low
Fayalite (mol%):20.7-26.9
Ferrosilite (mol%):19.9-23.8
Wollastonite (mol%):6.6-5.0
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):5.5
Type spec location:UWB
Main mass:G. Fujihara
Comments:GF14-3; submitted by A. Irving
Institutions
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Alan Mazur   
Bruno Caspirro   
Runar Sandnes   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7005 approved meteorites from (Northwest Africa) (plus 2002 unapproved names)

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