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Northwest Africa 8632
Basic information Name: Northwest Africa 8632
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8632
Observed fall: No
Year found: 2014
Country: Morocco
Mass:help 23.8 g
Meteoritical Bulletin:  MB 103  (2014)  Lunar (basalt)
Recommended:  Lunar (basalt)    [explanation]

This is 1 of 24 approved meteorites classified as Lunar (basalt).   [show all]
Search for other: Lunar meteorites
Comments: Approved 23 Nov 2014
Writeup from MB 103:

Northwest Africa 8632 (NWA 8632)


Purchased: 2014 Jun

Classification: Lunar meteorite (basalt)

History: Purportedly found near Chwichiya in 2013 and purchased by Luc Labenne in June 2014 from a dealer in Ouarzazate, Morocco.

Physical characteristics: A single, small, dense black stone (23.8 g) with a flat, squarish shape and no fusion crust. Magnetic susceptibility log χ = 3.08 (X in nm3/kg) (J. Gattacceca, CEREGE).

Petrography: (A. Irving and S. Kuehner, UWS) Porphyritic texture. Subhedral zoned olivine phenocrysts (up to 2.3 mm long, yellowish in thin section) are set in a groundmass composed mainly of elongate, zoned clinopyroxene grains (clear with pink rims), smaller olivine grains and interstitial regions (opaque in thin section) consisting of ilmenite needles, Ti-chromite, fine clinopyroxene, fayalite and glass. No plagioclase was found. Small patches and veinlets of pale yellow devitrified glass are present.

Geochemistry: Olivine phenocrysts (cores Fa32.5-32.8, FeO/MnO = 90-100, N = 3; rim Fa48.8, FeO/MnO = 98), groundmass olivine (Fa 72.6-74.1, FeO/MnO = 91-97, N = 3), augite (Fs23.7-27.1Wo40.1-40.5, FeO/MnO = 53-55, TiO2 = 2.4-2.6 wt.%, Al2O3 = 5.9- 6.1 wt.%, N = 2), subcalcic augite (Fs26.6-27.0Wo30.8-36.1, FeO/MnO = 54-60, TiO2 = 1.9-2.1 wt.%, Al2O3 = 4.7-5.6 wt.%, N = 2), ferroan subcalcic augite rim (Fs41.9Wo34.1, FeO/MnO = 63, TiO2 = 3.2 wt.%, Al2O3 = 8.1 wt.%). Bulk composition (R. Korotev, WUSL) INAA of subsamples gave the following mean abundances (in wt.%) FeO 22.6, Na2O 0.28; (in ppm) Sc 51.1, Ni 70, La 7.8, Sm 4.7, Eu 0.89, Yb 4.1, Lu 0.58, Hf 3.4, Th 1.25.

Classification: Lunar (mare basalt).

Specimens: 4.6 g including one polished thin section, one polished thick section and one polished mount at UWB. The main mass is held by Labenne.

Data from:
  Table 0
  Line 0:
Origin or pseudonym:Chwichiya
Place of purchase:Ouarzazate
Date:P 2014 Jun
Mass (g):23.8
Class:Lunar (basalt)
Shock stage:moderate
Weathering grade:low
Magnetic suscept.:3.08
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):4.8
Type spec location:UWB
Main mass:L. Labenne
Comments:M137; submitted by A. Irving
   and collections
CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 29 Oct 2018)
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)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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     This is 1 of 1929 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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