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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 100 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 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:
CreditPhotos
Public domain photographs:
Anthony Love      
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 50 approved meteorites from Tindouf, Algeria (plus 1 impact crater)
     This is 1 of 1236 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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