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Northwest Africa 13739
Basic information Name: Northwest Africa 13739
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13739
Observed fall: No
Year found: 2020
Country: Algeria
Mass:help 712 g
Classification
  history:
Recommended:  Lunar    [explanation]

This is 1 of 96 approved meteorites classified as Lunar.   [show all]
Search for other: Lunar meteorites
Comments: Approved 28 Mar 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13739 (NWA 13739)

Tindouf, Algeria

Purchased: 2020

Classification: Lunar meteorite

History: Many fragments weighing a total of 712 g were found near Tindouf, Algeria, by locals. Carlos Muñecas (Expometeoritos) and Adrian Contreras purchased these samples from a dealer in Tindouf in November 2020.

Physical characteristics: Samples are irregularly shaped and lack fusion crust. Most samples are covered with a coating of caliche that also occurs within the interior of the samples in fractures. The interior is a dark-colored, fine-grained breccia.

Petrography: Description and classification (A. Love, App) Sample is a complex breccia composed of fine-grained (250 µm avg.) lithic and olivine, low- and high-Ca pyroxene, pigeonite and mineral fragments: gabbroic clasts, brecciated feldspathic clasts, FeNi metal and rare symplectites composed of fayalitic olivine and silica. This assemblage is crosscut by a several generations of crosscutting melt veins. Additional Minerals are sulfides, chromite, ilmenite, rare phosphates and secondary calcite.

Geochemistry: Microgabbro: olivine (Fa30.0±8.9, Fe/Mn=80.4±10.2, n=12); low Ca pyroxene (Fs24.7±2.1Wo4.1±0.6, Fe/Mn=55.6±6.5, n=5); Mineral fragments: pigeonite (Fs30.9±6.2Wo12.0±5.0, Fe/Mn=52.9±4.2, n=15); high Ca pyroxene (Fs43.6±16.2Wo27.4±4.8, Fe/Mn=56.7±7.6, n=6); plagioclase (An96.8±0.9Or0.1±0.1, n=15).

Classification: Lunar (feldspathic breccia) Based on textures and mineral compositions, this sample is a lunar feldspathic breccia.

Specimens: Carlos Muñecas (Expometeoritos) holds the 228 g main mass and Adrian Contreras and Carlos Muñecas jointly hold the remaining 484 g. Eleven small fragments weighing a total of 23.47 g and a polished thin section are on deposit at App.

Data from:
  MB110
  Table 0
  Line 0:
State/Prov/County:Tindouf
Place of purchase:Tindouf
Date:P 2020
Mass (g):712
Pieces:Many
Class:Lunar
Shock stage:A-S3
Weathering grade:moderate
Fayalite (mol%):30.0±8.9
Ferrosilite (mol%):24.7±2.1; 30.9±6.2; 43.6±16.2
Wollastonite (mol%):4.1±0.6; 12.0±5.0; 27.4±4.8
Classifier:A. Love, App
Type spec mass (g):23.47
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:
Photos:
CreditPhotos
Public domain photographs:
Anthony Love      
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 43 approved meteorites from Tindouf, Algeria (plus 1 impact crater)
     This is 1 of 1133 approved meteorites from Algeria (plus 27 unapproved names) (plus 4 impact craters)

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