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Northwest Africa 10798
Basic information Name: Northwest Africa 10798
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10798
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 319 g
Meteoritical Bulletin:  MB 105  (2016)  Lunar (feldsp. breccia)
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 290 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 22 Oct 2016
Writeup from MB 105:

Northwest Africa 10798 (NWA 10798)

(Northwest Africa)

Purchased: 2016 May

Classification: Lunar meteorite (feldspathic breccia)

History: A stone was purchased by Ben Hoefnagels in May 2016 from a dealer in Ouarzazate, Morocco. Subsequently additional material was found at the same find site by the same nomad, and purchased by Ben Hoefnagels in August and September 2016.

Physical characteristics: Six larger stones (110.9, 82.1, 32.6, 30.8, 16.9, and 15.4 g) plus many smaller stones (total 29.9 g). All stones have the same distinctive appearance, lacking fusion crust but mostly coated by orange weathering products. The fresh interior exhibits whitish clasts in a light-gray matrix with visible vesicles.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia consisting of rounded to angular gabbroic anorthositic clasts, related crystalline debris, rare mare basalt clasts and very fine grained devitrified glassy clasts in a fine grained, partly vesicular matrix composed of quenchiform crystals plus glass. Minerals are anorthite, exsolved pigeonite, olivine (some forsteritic), augite, subcalcic augite, magnesian orthopyroxene, unexsolved pigeonite, ilmenite, Ti-chromite, troilite, minor primary Ba-Ca-K feldspar and secondary barite.

Geochemistry: Olivine (Fa6.0, FeO/MnO = 129; Fa53.7-60.6, FeO/MnO = 86-95; N = 4), pigeonite (Fs29.2Wo7.7, FeO/MnO = 47; Fs45.3Wo5.6, FeO/MnO = 53; N = 2), augite (Fs18.1Wo39.3, FeO/MnO = 41), orthopyroxene host (Fs59.4Wo2.1, FeO/MnO = 62), clinopyroxene exsolution lamella (Fs25.3Wo41.0, FeO/MnO = 45), plagioclase (An96.2-97.3Or0, N = 2).

Classification: Lunar (feldspathic regolith breccia).

Specimens: 20.66 g including one polished thin section at UWB; remainder with Mr. B. Hoefnagels.

Data from:
  Table 0
  Line 0:
Place of purchase:Ouarzazate
Date:P 2016 May
Mass (g):318.6
Class:Lunar (feldsp. breccia)
Shock stage:low
Weathering grade:low
Fayalite (mol%):6.0; 53.7-60.6
Ferrosilite (mol%):29.2; 45.3; 18.1
Wollastonite (mol%):7.7; 5.6; 39.3
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.66
Type spec location:UWB
Main mass:B. Hoefnagels
Comments:BH001; submitted by A. Irving
   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)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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     This is 1 of 8890 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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