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Northwest Africa 7931
Basic information Name: Northwest Africa 7931
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7931
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 5.9 g
Meteoritical Bulletin:  MB 102  (2013)  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 30 Nov 2013
Writeup from MB 102:

Northwest Africa 7931 (NWA 7931)

(Northwest Africa)

Purchased: 2013 May

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased by Alexandre Debienne in May 2013 from a dealer in Agadir, Morocco.

Physical characteristics: A single small stone (5.92 g) lacking fusion crust.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia consisting of numerous small mineral clasts in partly glassy, vesicular matrix. Minerals are anorthite, olivine, fayalite, pigeonite, ilmenite (with rare baddeleyite inclusions), Ti-rich chromite, troilite and minor kamacite.

Geochemistry: Olivine (Fa44.3-50.2; FeO/MnO = 85-96), orthopyroxene (Fs28.6Wo1.8; FeO/MnO = 60), pigeonite (Fs29.8-41.1Wo11.3-6.6; FeO/MnO = 52-62), ferroan subcalcic augite (Fs54.4Wo36.4; FeO/MnO = 63). Bulk composition (R. Korotev, WUSL): INAA of subsamples gave mean abundances of FeO 7.5 wt.%, and (in ppm) Sc 18, La 3.9, Sm 1.9, Eu 0.74, Yb 1.6, Th 0.6.

Classification: Lunar (feldspathic regolithic breccia).

Specimens: 1.2 g of material is at PSF. The remaining material is with ADebienne

Data from:
  Table 0
  Line 0:
Place of purchase:Agadir
Date:P 2013 May
Mass (g):5.92
Class:Lunar (feldsp. breccia)
Shock stage:low
Weathering grade:low
Fayalite (mol%):44.3-50.2
Ferrosilite (mol%):28.6; 29.8-41.1
Wollastonite (mol%):1.8; 11.3-6.6
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):1.2
Type spec location:PSF
Main mass:ADebienne
Comments:AD13201; submitted by P. Sipiera
   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)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
ADebienne: Rue de la Station 60, 6210 Reves, Belgium (private address; updated 29 Nov 2013)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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     This is 1 of 8890 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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