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Northwest Africa 12427
Basic information Name: Northwest Africa 12427
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12427
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 3.47 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 12427 (NWA 12427)

(Northwest Africa)

Find: 2017

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased in November 2017 in Nouakchott, Mauritania. Reportedly found in northeastern Western Sahara September 2017.

Physical characteristics: Single stone, no fusion crust; saw cut reveals a breccia with white feldspathic clasts set in a dark gray groundmass. Some of the feldspathic clasts appear to be aligned suggesting a mild deformation fabric.

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

Geochemistry: (C. Agee, UNM) Olivine Fa42.7±6.8, Fe/Mn=94±5, n=15; clinopyroxene Fs31.4±6.7Wo15.7±6.4, Fe/Mn=54±5, n=14; plagioclase An96.9±0.2, n=6; shock melt veins (proxy for bulk composition) SiO2=46.5±2.5, TiO2=0.30±0.15, Cr2O3=0.15±0.10, Al2O3=27.9±6.3, MgO=5.2±3.4, FeO=5.5±3.2, MnO=0.08±0.06, CaO=15.6±2.6, Na2O=0.27±0.07, K2O=0.05±0.02 (all wt%), n=6.

Classification: Lunar, feldspathic breccia

Specimens: 20.2 g on deposit at UNM, DPitt holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Nouakchott, Mauritania
Mass (g):3469
Class:Lunar (Feldsp. Breccia)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):42.7±6.8
Ferrosilite (mol%):31.4±6.7
Wollastonite (mol%):15.7±6.4
Classifier:C. Agee, UNM
Type spec mass (g):20.2
Type spec location:UNM
Main mass:Darryl Pitt
Comments:Field name MVCH328; 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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