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Northwest Africa 11783
Basic information Name: Northwest Africa 11783
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11783
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 65 g
Meteoritical Bulletin:  MB 107  (2018)  Lunar (Feldsp. Breccia)
Recommended:  Lunar (Feldsp. Breccia)    [explanation]

This is 1 of 312 approved meteorites classified as Lunar (Feldsp. Breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 26 May 2018
Writeup from MB 107:

Northwest Africa 11783 (NWA 11783)

(Northwest Africa)

Purchased: 20 Sep 2014

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased by Jay Piatek from a Moroccan meteorite dealer.

Physical characteristics: Several visually identical appearing pieces. No fusion crust. A saw cut reveals a fragmental breccia with white feldspathic clasts set in a dark gray ground mass.

Petrography: (C. Agee, UNM) This meteorite is a breccia of fragmental pyroxene, olivine, plagioclase grains. There are many domains that are fine-grained and cataclastic with shock melt and vesicles. Fe-metal, chromite, ilmenite, silica, and a phosphate mineral were detected.

Geochemistry: (C. Agee, UNM) olivine Fa: 28.1±4.8, Fe/Mn=100±2, n=4; clinopyroxene Fs19.0±4.4Wo23.1±17.6, Fe/Mn=52±8, n=3; plagioclase An94.6±1.3, n=3; Shock melt (20 μm defocused electron beam, proxy for bulk meteorite composition): SiO2=46.0±0.4, TiO2=0.51±0.02, Al2O3=28.0±0.5, Cr2O3=0.11±0.01, MgO=6.0±0.2, FeO=4.7±0.2, MnO=0.07±0.00, CaO=15.3±0.1, Na2O=0.61±0.03, K2O=0.16±0.01 (all wt%), n=7.

Classification: Lunar feldspathic breccia

Specimens: 13 g including a probe mount on deposit at UNM, Jay Piatek holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 20 Sep 2014
Mass (g):65
Class:Lunar (Feldsp. Breccia)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):28.1±4.8
Ferrosilite (mol%):19.0±4.4
Wollastonite (mol%):23.1±17.6
Classifier:C. Agee, UNM
Type spec mass (g):13
Type spec location:UNM
Main mass:Jay Piatek
Comments:Field name JP-29; submitted by C. Agee, UNM
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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