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Northwest Africa 10656
Basic information Name: Northwest Africa 10656
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10656
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 263 g
Meteoritical Bulletin:  MB 105  (2016)  Lunar (diabase)
Recommended:  Lunar    [explanation]

This is 1 of 101 approved meteorites classified as Lunar.   [show all]
Search for other: Lunar meteorites
Comments: Approved 30 Sep 2016
Writeup from MB 105:

Northwest Africa 10656 (NWA 10656)

(Northwest Africa)

Purchased: 2016 Jan

Classification: Lunar (diabase)

History: Purchased by Darryl Pitt in January 2016 from a Mauritanian dealer.

Physical characteristics: A single stone (262.5 g) lacking fusion crust. The fresh interior is relatively coarse grained and is dominated by brown, pale green and white grains.

Petrography: (A. Irving and S. Kuehner, UWS) Intersertal texture (mean grainsize ~1.5 mm). Composed of simply-twinned clinopyroxene (both pigeonite and subcalcic augite), olivine (with secondary brown staining along fractures), laths of calcic plagioclase (birefringent but with undulose extinction) and accessory ilmenite, chromite, baddeleyite and zirconolite.

Geochemistry: Olivine (Fa33.8-34.0, FeO/MnO = 92; Fa45.9, FeO/MnO = 87; N = 3), pigeonite (Fs25.3Wo9.7; Fs33.6Wo11.9; FeO/MnO = 48-51, N = 2), subcalcic augite (Fs15.8-17.5Wo36.3-34.2, FeO/MnO = 38-41, N = 3), plagioclase (An88.3-91.6Or4.1-3.4, N = 2). Bulk composition (R. Korotev, WUSL) INAA of whole rock powder gave (in wt.%) FeO 19.7, Na2O 0.18; (in ppm) Sc 34.3, Cr 3190, La 12.4, Sm 5.9, Eu 0.43, Yb 4.0, Lu 0.59, Hf 4.3, Th 1.9.

Classification: Lunar (olivine diabase). This specimen has affinities with NWA 2977, NWA 6950 and NWA 8127 based on mineralogical and bulk compositional similarities, but differs in texture from those meteorites

Specimens: 22 g including one polished thin section at UWB; remainder with DPitt.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2016 Jan
Mass (g):262.5
Class:Lunar (diabase)
Shock stage:moderate
Weathering grade:low
Fayalite (mol%):33.8; 45.9
Ferrosilite (mol%):25.3; 33.6; 15.8-17.5
Wollastonite (mol%):9.7; 11.9; 36.3-34.2
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):22
Type spec location:UWB
Main mass:D. Pitt
Comments:MCVICH 32; 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. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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