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Northwest Africa 5766
Basic information Name: Northwest Africa 5766
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 5766
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 298 g
Meteoritical Bulletin:  MB 106  (2018)  Mesosiderite-an
Recommended:  Mesosiderite-an    [explanation]

This is 1 of 7 approved meteorites classified as Mesosiderite-an.   [show all]
Search for other: Mesosiderites, Metal-rich meteorites
Comments: Approved 14 Mar 2017
Writeup from MB 106:

Northwest Africa 5766 (NWA 5766)

(Northwest Africa)

Purchased: 2005

Classification: Mesosiderite (anomalous)

History: Purchased by Fabien Kuntz in 2005 from a dealer in Midelt, Morocco.

Physical characteristics: A group of small brown stones (total weight 298 g). Fresher interiors are gray with visible partly altered metal.

Petrography: (A. Irving and S. Kuehner, UWS) Aggregate of predominantly calcic plagioclase (~35 vol%), unexsolved pigeonite and altered kamacite (25 vol.%) with minor orthopyroxene, augite, silica polymorph, taenite and rare schreibersite. Thin iron hydroxide veinlets are present.

Geochemistry: Pigeonite (Fs37.4-37.7Wo10.3-8.7, FeO/MnO = 26-27, N = 3, orthopyroxene (Fs36.1Wo1.4, FeO/MnO =21), augite (Fs20.6Wo39.3, FeO/MnO = 19), plagioclase An931.3-92.4Or0.4 (N=2).

Classification: Mesosiderite, anomalous . The dominant pyroxene is relatively magnesian pigeonite, which is anomalous for mesosiderites.

Specimens: 20.9 g including one polished piece at PSF; remaining material with Kuntz.

Data from:
  Table 0
  Line 0:
Place of purchase:Midelt
Date:P 2005
Mass (g):298
Shock stage:low
Weathering grade:moderate
Ferrosilite (mol%):36.1; 37.4-37.7
Wollastonite (mol%):1.4; 10.3-8.7
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.9
Type spec location:PSF
Main mass:F. Kuntz
Comments:K100; submitted by A. Irving
   and collections
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
Kuntz: Fabien Kuntz, France; Website (private address)
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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     This is 1 of 8777 approved meteorites from (Northwest Africa) (plus 1879 unapproved names)

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