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Northwest Africa 13942
Basic information Name: Northwest Africa 13942
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13942
Observed fall: No
Year found: 2021
Country: Algeria
Mass:help 1036 g
Classification
  history:
Recommended:  Lunar    [explanation]

This is 1 of 97 approved meteorites classified as Lunar.   [show all]
Search for other: Lunar meteorites
Comments: Approved 29 May 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13942 (NWA 13942)

Algeria

Purchased: 2021

Classification: Lunar meteorite

History: (C. Muñecas, Expometeoritos) A single piece was found by a nomad in a place in northwest Africa of unknown coordinates. The meteorite was eventually purchased by Carlos Muñecas from a dealer in Tindouf in March of 2021.

Physical characteristics: Sample is irregular-shaped and has a light orangish grey exterior. The cut face shows the interior is darker gray and shows a brecciated, microvesicular texture with visible Fe metal grains.

Petrography: Description and classification (A. Love, App) Sample is a breccia composed of rounded lithic and anhedral mineral clasts surrounded by a melt matrix. Lithic clasts include: anorthosite, norite, troctolite, brecciated and shock melted clasts. Mineral clasts are dominantly anorthite with minor olivine, some of which is zoned. Matrix areas within the thin section show some regions with schlieren textures and fine vesicles. Additional minerals are: <1 vol% FeNi grains, chromite, ilmenite, sulfide, secondary gypsum and calcite.

Geochemistry: Olivine (Fa26.5±3.7, Fe/Mn=80.7±3.4, n=16); low Ca pyroxene (Fs22.7±1.7Wo4.3±0.5, Fe/Mn=50.6±2.0, n=6); pigeonite (Fs24.0±2.8Wo7.2±1.7, Fe/Mn=48.4±4.6, n=12); high Ca Pyroxene (Fs15.5±1.2Wo35.6±6.0, Fe/Mn=46.5±0.5, n=8); plagioclase (An97.5±0.5Or0.1±0.1, n=10).

Classification: Lunar (feldspathic melt breccia). Textures and mineral compositions indicate this sample is a melt breccia containing anorthositic to mafic clasts.

Specimens: Carlos Muñecas (Expometeoritos) and Adrian Contreras hold the 1008 g main mass. An endcut and two fragments weighing 26.30 g and a polished thin section are on deposit at App.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Tindouf
Date:P 2021
Mass (g):1036
Pieces:1
Class:Lunar
Shock stage:A-S3
Weathering grade:low
Fayalite (mol%):26.5±3.7
Ferrosilite (mol%):22.7±1.7;15.5±1.2
Wollastonite (mol%):4.3±0.5; 35.6±6.0
Classifier:Anthony Love
Type spec mass (g):26.3
Type spec location:App
Main mass:Carlos Muñecas (Expometeoritos)
Comments:Submitted by Anthony Love
Institutions
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1166 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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