Meteoritical Bulletin: Entry for Northwest Africa 13865

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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: 94 g

Classification
history:

Recommended:

LL3 [explanation]

This is 1 of 469 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

Writeup

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 (Fa_23.3±12.9, range Fa_4.9-43.8, N = 10; Cr₂O₃ in ferroan olivine <0.09 wt.%), low-Ca pyroxene (Fs_16.6±8.7Wo_2.4±1.8, range Fs_2.6-25.5Wo_0.4-4.9, N = 5), pigeonite (Fs_30.5Wo_16.8), augite (Fs_4.6Wo_37.4), plagioclase in chondrule (An_82.9Or_0.2). 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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)

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:

Credit	Photos
Public domain photographs:
A. Irving

Geography:

Mali

Coordinates:

Unknown.

Statistics:
This is 1 of 104 approved meteorites from Mali (plus 2 unapproved names)

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