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Northwest Africa 11517
Basic information Name: Northwest Africa 11517
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11517
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 88 g
Meteoritical Bulletin:  MB 107  (2018)  Lunar (feldsp. breccia)
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 340 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 24 Feb 2018
Writeup from MB 107:

Northwest Africa 11517 (NWA 11517)

Northwest Africa

Purchased: 2017

Classification: Lunar meteorite (feldspathic breccia)

History: Four individuals weighing a total of 88 g were found near Tindouf, Algeria. John Sinclair purchased the stones from a Moroccan meteorite hunter at the Sainte Marie Aux Mines mineral show in France during June of 2017.

Physical characteristics: Sample is irregular-ovoid shaped and lacks fusion crust. The exterior surface is weathered and light orangish-gray in color. The stone shows brecciated texture composed of dominant light-colored clasts in a dark grey matrix. FeNi grains are present in several slices. Pits from weathering of clasts and vesicles contain orange caliche.

Petrography: Description and classification (A. Love, App) Sample is a polymict breccia composed of 0.5-3 mm irregularly shaped lithic and mineral clasts set within a micro-vesiclar, melt matrix. Clasts are composed of poikilitic gabbro, vitrophyric, anorthosite, crystalline impact melt, and basaltic lithologies. Minerals clasts include olivine, exsolved Ca-rich and Ca-poor pyroxene, baddeleyite, ulvospinel, ilmenite, chromite, FeS, kamacite, taenite, Si-polymorph.

Geochemistry: (A. Love, App) Olivine (Fa18.65-53.01, FeO/MnO=83.29-109.49, N=12), Opx (Fs16.43-42.54 Wo2.92-4.47, FeO/MnO=53.16-60.73, N=5), pigeonite (Fs40.64-67.00 Wo5.14-11.16, FeO/MnO=54.93-67.00, N=8); augite (Fs17.44-36.61 Wo19.71-43.48, N=8); pyroxeferroite Fs70.28 Wo5.8, FeO/MnO=60.5, N=1); plagioclase An95.55-98.72 Or0.00-0.27, N=15).

Classification: Lunar (feldspathic breccia). Textures and mineral compositions indicate this sample is a feldspathic breccia. FeO/MnO ratios from olivine and pyroxene and An-content of plagioclase suggest this sample is a lunar feldspathic breccia.

Specimens: J. Sinclair holds the main masses. An individual and a slice weighing 17.6 g and one polished thin section are on deposit at App.

Data from:
  Table 0
  Line 0:
Place of purchase:St. Marie aux Mines
Date:P 2017
Mass (g):88
Class:Lunar (feldsp. breccia)
Shock stage:moderate
Weathering grade:low
Fayalite (mol%):18.6-53.0
Ferrosilite (mol%):16.4-42.5; 40.6-67.0; 17.4-36.6
Wollastonite (mol%):2.9-5.8; 5.9-26.2; 30.7-43.5
Classifier:A. Love, App
Type spec mass (g):17.6
Type spec location:App
Main mass:J. Sinclair
Comments:Submitted by Anthony Love
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)

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