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Northwest Africa 11789
Basic information Name: Northwest Africa 11789
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11789
Observed fall: No
Year found: 2017
Country: Mauritania
Mass:help 5.49 kg
Meteoritical Bulletin:  MB 107  (2018)  Lunar (feldsp. breccia)
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 336 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 11789 (NWA 11789)


Purchased: 2017

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased in Mauritania by Dustin Dickens from anonymous meteorite hunter.

Physical characteristics: Seven black visually identical appearing pieces that fit back together to form a single mass with the largest piece weighing over 2 kg and the smallest under 45 g. The larger pieces show a black-brown fusion crust and thumb printing. Saw cut reveals a fragmented breccia with white feldspathic clasts set in a black ground mass.

Petrography: (C. Agee, UNM) This meteorite is a polymict breccia of fragmental feldspathic and mafic lithologies, as well as fragmental pyroxene, olivine, plagioclase grains, and shock melt.

Geochemistry: (C. Agee, UNM) Olivine Fa: 31.7±6.3, Fe/Mn=92±9, n=10; clinopyroxene Fs32.2±10.8Wo12.9±8.2, Fe/Mn=54±8, n=12; plagioclase An96.7±0.8, n=7; Shock melt (20 µm defocused electron beam, proxy for bulk meteorite composition): SiO2=43.6±0.8, TiO2=0.19±0.13, Al2O3=27.6±5.0, Cr2O3=0.12±0.08, MgO=6.7±4.4, FeO=4.3±2.9, MnO=0.06±0.04, CaO=15.7±2.3, Na2O=0.34±0.13, K2O=0.09±0.05 (all wt%), n=6.

Classification: Lunar feldspathic breccia

Specimens: 43.15 g including a probe mount on deposit at UNM, Dustin Dickens holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2017
Mass (g):5492
Class:Lunar (feldsp. breccia)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):31.7±6.3
Ferrosilite (mol%):32.2±10.8
Wollastonite (mol%):12.9±8.2
Classifier:C. Agee, UNM
Type spec mass (g):43.15
Type spec location:UNM
Main mass:Dustin Dickens
Comments:Field name DD-22; 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 221 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters)

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