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Northwest Africa 13865
Basic information Name: Northwest Africa 13865
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13865
Observed fall: No
Year found: 2020
Country: Mali
Mass:help 94 g
Classification
  history:
Recommended:  LL3    [explanation]

This is 1 of 418 approved meteorites classified as LL3.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 20 Dec 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13865 (NWA 13865)

Mali

Purchased: 2020 Jan

Classification: Ordinary chondrite (LL3)

History: Purchased by Mbark Arjdal in January 2020 from a dealer in Timbuktu, Mali.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Very closely packed, well-formed glass-bearing chondrules (apparent diameter 1510±960 µm, N = 24) are set in a very sparse fine grained matrix. Accessory phases include troilite, kamacite and taenite.

Geochemistry: Olivine (Fa23.3±12.9, range Fa4.9-43.8, N = 10; Cr2O3 in ferroan olivine <0.09 wt.%), low-Ca pyroxene (Fs16.6±8.7Wo2.4±1.8, range Fs2.6-25.5Wo0.4-4.9, N = 5), pigeonite (Fs30.5Wo16.8), augite (Fs4.6Wo37.4), plagioclase in chondrule (An82.9Or0.2). Magnetic susceptibility log χ (× 10-9 m3/kg) = 4.25.

Classification: Ordinary chondrite (LL3).

Specimens: 21.6 g including one polished thin section at UWB; remainder with Mr. M. Arjdal.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Timbuktu, Mali
Date:P 2020 Jan
Mass (g):94
Pieces:1
Class:LL3
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):23.3±12.9
Ferrosilite (mol%):16.6±8.7
Wollastonite (mol%):2.4±1.8
Magnetic suscept.:4.25
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):21.6
Type spec location:UWB
Main mass:M. Arjdal
Comments:Work name Arj ZM 571; submitted by A. Irving
Institutions
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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Photos:
CreditPhotos
Public domain photographs:
A. Irving   
Geography:

Mali
Coordinates:Unknown.

Statistics:
     This is 1 of 69 approved meteorites from Mali (plus 1 unapproved name)

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