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Northwest Africa 10810
Basic information Name: Northwest Africa 10810
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10810
Observed fall: No
Year found: 2016
Country: Mauritania
Mass:help 402 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  Lunar
Recommended:  Lunar    [explanation]

This is 1 of 89 approved meteorites classified as Lunar.   [show all]
Search for other: Lunar meteorites
Comments: Approved 13 Sep 2016
Writeuphelp
Writeup from MB 105:

Northwest Africa 10810 (NWA 10810)

Mauritania

Purchased: 2016

Classification: Lunar meteorite

History: Two stones weighing 126.2 and 276.2 g were found in Mauritania and subsequently purchased in Rissani in 2015. J. Donald Cline and John Sinclair acquired the samples from a meteorite prospector at the Tucson Gem and Mineral Show in February 2016.

Physical characteristics: Sample has an irregular-ovoid shape and lacks fusion crust. The exterior surface is weathered and light orangish-gray in color. One half of the stone shows an obvious brecciated texture composed of dominant light-colored clasts in a dark matrix. The other half appears to have been buried and contains an orangish layer of caliche. One edge has a window cut into the stone showing a mixture of rounded dark and light-colored lithic and mineral clasts in a dark brown matrix. One slice contains an FeNi grain.

Petrography: Description and classification (A. Love, App): Sample is a polymict breccia composed of 5 mm sub-rounded to angular lithic clasts and mineral clasts set within a micro-vesicular black glassy matrix. Up to 5 mm subrounded to subangular clasts of olivine gabbro with exsolved pyroxenes, troctolite, subophitic olivine basalt and exsolved pyroxenes, granulitic anorthosite and poikolitic crystalline impact melt breccia are the dominant lithic fragments represented in the sample. Additionally, the sample contains mineral grains, and symplectites composed of fayalite, Si-rich grains and Ca-pyroxene in addition to glassy spherules and flow-banded agglutinates. Accessory minerals ilmenite, ferroan chromite, fayalite and a silica polymorph.

Geochemistry: (A. Love, App): Olivine (Fa23.1-45.3; FeO/MnO=95.8-114.7, N=20), pigeonite (Fs25.8-30.1Wo16.3-7.3 N=14; Fs46.4-57.2Wo20.0-7.8; FeO/MnO=54.4-73.5, N=4); augite (Fs16.5-21.5Wo23.8-38.5; FeO/MnO=47.2-52.0, N=9); fayalite (Fa90.7-97.6; FeO/MnO=93.3-96.8, N=6); plagioclase An95.0±2.7Or0.2±0.2, N=13). Bulk Composition: (R. Korotev, WUSL): INAA of 100 mg gave (in wt%) Na2O 0.4, FeO 10.9; (in ppm) Sc 19.7, Cr 17.8, Co 42.1, Ni 220, La 7.3, Sm 3.3, Eu 0.91, Yb 2.3, Lu 0.3, Hf 2.5, Th 1.1.

Classification: Lunar (mingled regolith breccia)

Specimens: PARI holds the main masses (276.2 and 89.07 g). A slice and an end cut weighing 20.82 g and one polished thin section are on deposit at App.

Data from:
  MB105
  Table 0
  Line 0:
Place of purchase:Tuscon Gem and Mineral Show
Date:P 2016
Mass (g):402.4
Pieces:2
Class:Lunar
Shock stage:moderate
Weathering grade:low
Fayalite (mol%):23.1-45.3; 90.7-97.6
Ferrosilite (mol%):25.8-30.1; 46.4-57.2; 16.5-21.5
Wollastonite (mol%):16.3-7.3; 20.0-7.8; 23.8-38.5
Classifier:A. Love, App
Type spec mass (g):20.8
Type spec location:App
Main mass:PARI
Finder:Anonymous
Comments:Submitted by Anthony Love
Institutions
   and collections
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
PARI: Pisgah Astronomical Research Institute 1 Pari Dr Rosman, NC 28772, United States (institutional address; updated 13 Sep 2016)
Catalogs:
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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Geography:

Mauritania
Coordinates:Unknown.

Statistics:
     This is 1 of 127 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters)

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