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Northwest Africa 11871
Basic information Name: Northwest Africa 11871
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11871
Observed fall: No
Year found: 2018
Country: Algeria
Mass:help 21.9 g
Meteoritical Bulletin:  MB 107  (2018)  Lunar (feldsp. breccia)
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 288 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 17 Jul 2018
Writeup from MB 107:

Northwest Africa 11871 (NWA 11871)


Purchased: 2018 May

Classification: Lunar meteorite (feldspathic breccia)

History: Purportedly found near Tindouf, Algeria and purchased by Joseph Hum in May 2018 from a dealer in Gladstone, Oregon, who obtained it from a Mauritanian source.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia consisting of mineral clasts of anorthite, olivine, exsolved pigeonite, unexsolved pigeonite,orthopyroxene, aluminous subcalcic augite, chromite, ilmenite, troilite and kamacite in a fine grained, partly vesicular matrix.

Geochemistry: Olivine (Fa19.7-51.6, FeO/MnO = 92-105, N = 3), orthopyroxene host (Fs45.7Wo3.6, FeO/MnO = 55), clinopyroxene exsolution lamella (Fs24.2Wo34.6, FeO/MnO = 54), orthopyroxene (Fs47.9Wo3.6, FeO/MnO = 59), pigeonite (Fs24.8Wo10.0, FeO/MnO = 68), aluminous subcalcic augite (Fs18.5Wo23.9, FeO/MnO = 56, Al2O3 = 15.4 wt.%, Na2O = 0.4 wt.%), plagioclase (An94.1-96.4Or0.3-0.1).

Classification: Lunar (feldspathic regolithic breccia).

Specimens: 4.73 g including a polished endcut at UWB; remainder with Mr. J. Hum.

Data from:
  Table 0
  Line 0:
Place of purchase:Gladstone, Oregon
Date:P 2018 May
Mass (g):21.9
Class:Lunar (feldsp. breccia)
Shock stage:low
Weathering grade:low
Fayalite (mol%):19.7-51.6
Ferrosilite (mol%):45.7-47.9
Wollastonite (mol%):3.6
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):4.73
Type spec location:UWB
Main mass:J. Hum
Comments:Work name Hum18-1; 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. 107, MAPS 55, 460-462
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     This is 1 of 1232 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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