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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 431 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 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:
A. Irving   
Geography:

Mali
Coordinates:Unknown.

Statistics:
     This is 1 of 79 approved meteorites from Mali (plus 2 unapproved names)

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