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Northwest Africa 12428
Basic information Name: Northwest Africa 12428
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12428
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 2.07 kg
Meteoritical Bulletin:  MB 108  (2020)  Lunar (Feldsp. Breccia)
Recommended:  Lunar (Feldsp. Breccia)    [explanation]

This is 1 of 288 approved meteorites classified as Lunar (Feldsp. Breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 9 Feb 2019
Writeup from MB 108:

Northwest Africa 12428 (NWA 12428)

(Northwest Africa)

Find: 2017 Oct

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased in November 2017 in Nouakchott, Mauritania. Reportedly found in Algeria near the northern Mali border region, October 2017.

Physical characteristics: Single stone, no fusion crust; saw cut reveals a breccia with scattered light-colored clasts set in a predominantly dark gray groundmass.

Petrography: (C. Agee, UNM) Microprobe examination shows fragmental breccia with many diverse clasts set in fine-grained, cataclastic groundmass. Melt veins and vesicles are present throughout.

Geochemistry: (C. Agee, UNM) Olivine Fa23.5±14.5, Fe/Mn=102±20, n=9; clinopyroxene Fs25.4±12.0Wo11.0±11.1, Fe/Mn=55±7, n=21; plagioclase An96.5±0.3, n=14; shock melt veins (proxy for bulk composition) SiO2=46.1±1.2, TiO2=0.25±0.15, Cr2O3=0.16±0.08, Al2O3=24.3±2.5, MgO=9.6±2.9, FeO=6.3±2.7, MnO=0.09±0.03, CaO=13.7±1.0, Na2O=0.38±0.11, K2O=0.10±0.06 (all wt%), n=4.

Classification: Lunar, feldspathic breccia

Specimens: 23.8 g on deposit at UNM, DPitt holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Nouakchott, Mauritania
Date:2017 Oct
Mass (g):2070
Class:Lunar (Feldsp. Breccia)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):23.5±14.5
Ferrosilite (mol%):25.4±12.0
Wollastonite (mol%):11.0±11.1
Classifier:C. Agee, UNM
Type spec mass (g):23.8
Type spec location:UNM
Main mass:Darryl Pitt
Comments:Field name MVCH329; 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 Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 8745 approved meteorites from (Northwest Africa) (plus 1880 unapproved names)

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