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Northwest Africa 8701
Basic information Name: Northwest Africa 8701
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8701
Observed fall: No
Year found: 2014
Country: Mali
Mass:help 72 g
Meteoritical Bulletin:  MB 103  (2014)  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 28 Dec 2014
Writeup from MB 103:

Northwest Africa 8701 (NWA 8701)


Purchased: 2014 Sep

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased by Stefan Ralew in September 2014 in Erfoud, Morocco.

Physical characteristics: Single stone (72 g) lacking fusion crust and composed of angular, mostly whitish clasts in a very dark gray matrix with some crosscutting veins of vesicular glass.

Petrography: (A. Irving and S. Kuehner, UWS) Fragmental olivine-poor breccia composed of mineral clasts in a finer matrix. Minerals include anorthite, pigeonite, orthopyroxene, augite, ilmenite and merrillite, along with rare olivine, Cr-armalcolite and kamacite.

Geochemistry: Orthopyroxene (Fs27.0Wo2.6; FeO/MnO = 70, N = 1), ferroan pigeonite (Fs53.0Wo16.8, FeO/MnO = 65, N = 1), pigeonite (core Fs26.5Wo19.8; FeO/MnO = 54; rim Fs71.6Wo25.2; FeO/MnO = 85), augite (Fs23.4Wo41.0, FeO/MnO = 58, N = 1), olivine (Fa30.4, FeO/MnO = 92; Fa11.3, FeO/MnO = 117, N = 2), plagioclase (An96.1-96.5Or0.1-0.5, N = 2). Bulk composition (R. Korotev, WUSL) INAA of subsamples gave the following mean abundances (in wt.%) FeO 5.2, Na2O 0.44; (in ppm) Sc 11.8, La 6.0, Sm 2.5, Eu 0.85, Yb 2.3, Lu 0.32, Th 1.7.

Classification: Lunar (feldspathic fragmental breccia). This specimen contains much less olivine than most lunar feldspathic breccias, but some of the olivine that is present is very magnesian.

Specimens: 14.4 g including one polished endcut at UWB; main mass with Ralew.

Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2014 Sep
Mass (g):72
Class:Lunar (feldsp. breccia)
Shock stage:moderate
Weathering grade:low
Fayalite (mol%):30.4; 11.3
Ferrosilite (mol%):27.0; 26.5; 23.4; 53.0
Wollastonite (mol%):2.6; 19.8; 41.0; 16.8
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):14.4
Type spec location:UWB
Main mass:S. Ralew
Comments:AB14-5; 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)
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)
Ralew: Stefan Ralew, Kunibertstra├če 29, 12524 Berlin, Germany; Website (private address)
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 79 approved meteorites from Mali (plus 2 unapproved names)

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