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Northwest Africa 8586
Basic information Name: Northwest Africa 8586
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8586
Observed fall: No
Year found: 2014
Country: Mauritania
Mass:help 705 g
Meteoritical Bulletin:  MB 103  (2014)  Lunar (feldsp. breccia)
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 321 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 10 Nov 2014
Writeup from MB 103:

Northwest Africa 8586 (NWA 8586)


Purchased: 2014 Feb

Classification: Lunar meteorite (feldspathic breccia)

History: Purportedly found in Mauritania and purchased by Darryl Pitt in February 2014 from a dealer in Nouadhibou, Mauritania.

Physical characteristics: Single stone (704.5 g) composed of light gray to beige clasts in a dark gray matrix.

Petrography: (A. Irving and S. Kuehner, UWS) Fragmental breccia consisting of angular clasts in a finer grained matrix. Minerals are olivine orthopyroxene, subcalcic augite, augite, diopside), anorthite, ilmenite, troilite, rare kamacite and taenite. Several small mare basalt clasts were observed.

Geochemistry: Olivine (Fa21.7-47.0, FeO/MnO = 80-85, N = 3), orthopyroxene (Fs32.3-47.7Wo2.9-2.7, FeO/MnO = 53-65), subcalcic augite (Fs45.3-51.6Wo25.6-21.4, FeO/MnO = 55-59), augite (Fs13.7-14.2Wo44.3-44.0, FeO/MnO = 36-39), diopside (Fs8.7Wo40.8, FeO/MnO = 38), plagioclase (An96.9-97.4Or0.1-0.2). Bulk composition (R. Korotev, WUSL) INAA of subsamples gave the following mean abundances (in wt.%) FeO 4.3, Na2O 0.39; (in ppm) Sc 8.5, Ni 66, La 2.7, Sm 1.18, Eu 0.81, Yb 1.10, Lu 0.156, Hf 0.94, Th 0.7.

Classification: Lunar (feldspathic fragmental breccia).

Specimens: 20.1 g including one polished thin section at UWB. The main mass is held by DPitt.

Data from:
  Table 0
  Line 0:
Place of purchase:Nouadhibou
Date:P 2014 Feb
Mass (g):704.5
Class:Lunar (feldsp. breccia)
Shock stage:low
Weathering grade:low
Fayalite (mol%):21.7-47.0
Ferrosilite (mol%):32.3-47.7
Wollastonite (mol%):2.9-2.7
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.1
Type spec location:UWB
Main mass:D. Pitt
Comments:MAC 42; 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)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; 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 200 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters)

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