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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:
Meteoritical Bulletin:  MB 110  (2022)  Lunar (frag. breccia)
Recommended:  Lunar (frag. breccia)    [explanation]

This is 1 of 32 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 Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
chen wang      
Eric Escrich         
Richard C Cavalieri   
Ryan Upchurch   
Geography:

Mauritania
Coordinates:Unknown.

Statistics:
     This is 1 of 221 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters)
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