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Northwest Africa 13992
Basic information Name: Northwest Africa 13992
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13992
Observed fall: No
Year found: 2021
Country: Mauritania
Mass:help 1035 g
Classification
  history:
Recommended:  Lunar (frag. breccia)    [explanation]

This is 1 of 7 approved meteorites classified as Lunar (frag. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 18 Jun 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13992 (NWA 13992)

Mauritania

Purchased: 2021

Classification: Lunar meteorite (frag. breccia)

History: Found in 2020 by Mauritanian meteorite hunters. Purchased by Douglas Chenin from a Mauritanian meteorite dealer in 2021.

Physical characteristics: Several identical large individuals and multiple medium to small identical individuals totaling 1035 g. Shiny, irregular shaped, sandblasted exteriors with patches of two colors, dark brown and light brownish-yellow, representing the main lithologies in these meteorite samples.

Petrography: (C. Agee, UNM) Electron microprobe analysis of a polished mount shows this meteorite to be a lunar polymict breccia with at least two distinct lithologies. Lithology 1: this is feldspathic breccia consisting of fragments of olivine and pyroxene, and anorthitic plagioclase, with accessory phases Fe,Ni-metal, Fe-sulfide, ilmenite, and chromite. Lithology 2: this is a basaltic textured domain with intergranular pyroxene and plagioclase grains that grades into a partially shock melted pyroxene cumulate textured domain, with minor barite, Fe-sulfide, ilmenite, and silica -- olivine is absent.

Geochemistry: (A. Ross, UNM) olivine Fa48.1±9.0, Fe/Mn=104±12, n=12; clinopyroxene Fs38.5±14.9Wo13.8±13.9, Fe/Mn=58±7, n=13; plagioclase An94.9±1.7, n=6.

Classification: Polymict fragmental lunar breccia.

Specimens: 24.05 g on deposit at UNM, DChenin holds the main mass.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2021
Mass (g):1035
Pieces:Several
Class:Lunar (frag. breccia)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):48.1±9.0
Ferrosilite (mol%):38.5±14.9
Wollastonite (mol%):13.8±13.9
Classifier:C. Agee, UNM
Type spec mass (g):24.05
Type spec location:UNM
Main mass:DChenin
Comments:Submitted by C. Agee
Institutions
   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)
DChenin: The Dr. Douglas Chenin Collection, United States; Website (institutional address; updated 15 Mar 2021)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
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Geography:

Mauritania
Coordinates:Unknown.

Statistics:
     This is 1 of 147 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters)

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