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Northwest Africa 11523
Basic information Name: Northwest Africa 11523
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11523
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 3.36 kg
Meteoritical Bulletin:  MB 106  (2018)  Lunar (Feldsp. Breccia)
Recommended:  Lunar (Feldsp. Breccia)    [explanation]

This is 1 of 321 approved meteorites classified as Lunar (Feldsp. Breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 6 Dec 2017
Writeup from MB 106:

Northwest Africa 11523 (NWA 11523)

(Northwest Africa)

Purchased: 2017

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased in March 2017 from Aziz Habibi in Erfoud, Morocco

Physical characteristics: Single stone. A saw cut reveals a breccia dominated by white felspathic clasts set in a dark-gray groundmass, some desert caliche is present along cracks.

Petrography: (C. Agee, UNM) Microprobe examination shows fragmental breccia of olivine, pyroxene, and plagioclase. Melt veins and vesicles are present throughout. Augite and pigeonite show subparallel iron-enrichment trends. There appears to be only one population of augite and pigeonite pairs suggesting that this is a monomict breccia. Plagioclase is uniform in composition at 98.5±0.2% anorthite. Ubiquitous minor ilmenite, chromite, and Fe-Ni metal were observed.

Geochemistry: (C. Agee, UNM) Olivine Fa26.2±7.1, Fe/Mn=89±5, n=9; pigeonite Fs32.6±5.5Wo6.5±4.1, Fe/Mn=60±5, n=8; augite Fs26.6±8.6Wo36.4±4.6, Fe/Mn=55±8, n=8; plagioclase An98.5±0.2Ab1.4±0.2Or0.1±0.0, n=8; shock melt vein (proxy for bulk composition) SiO2=43.3±0.7, TiO2=0.16±0.03, Cr2O3=0.10±0.05, Al2O3=25.9±3.6, MgO=8.7±4.2, FeO=6.0±2.3, MnO=0.07±0.02, CaO=15.0±2.1, Na2O=0.30±0.07, K2O=0.03±0.01 (all wt%), n=5.

Classification: Lunar, monomict feldspathic breccia

Specimens: 20.6 g on deposit at UNM, DPitt holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2017
Mass (g):3362
Class:Lunar (Feldsp. Breccia)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):26±7.1
Ferrosilite (mol%):32.6±5.5, 26.6±8.6
Wollastonite (mol%):6.5±4.1, 36.4±4.6
Classifier:C. Agee, UNM
Type spec mass (g):20.6
Type spec location:UNM
Main mass:Darryl Pitt
Comments:Field name MVCH269; 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)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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     This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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