Meteoritical Bulletin: Entry for Northwest Africa 13182

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Northwest Africa 13182

Basic information

Name: Northwest Africa 13182
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13182
Observed fall: No
Year found: 2019
Country: Mali
Mass: 83 g

Classification
history:

Recommended:

LL3 [explanation]

This is 1 of 451 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 9 Feb 2020

Writeup

Writeup from MB 109:

Northwest Africa 13182 (NWA 13182)

Mali

Purchased: 2019 Aug

Classification: Ordinary chondrite (LL3)

History: Purchased by Mbark Arjdal in August 2019 from a dealer in Timbuktu, Mali.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Well-formed, closely-packed chondrules (apparent diameter 930 ± 510 µm, N = 23) are set in a medium-grained matrix containing stained kamacite, taenite, low-Ti chromite, troilite and pentlandite.

Geochemistry: Olivine (Fa_23.6±13.7, range Fa_0.7-45.6, N = 9; Cr₂O₃ in ferroan examples 0.01-0.52 wt.%, mean0.11 wt.%, sd 0.17 wt.%, N = 13), low-Ca pyroxene (Fs_15.8±7.1Wo_0.8±1.1, range Fs_5.4-23.9Wo_0.1-3.0, N = 6), pigeonite (Fs_27.0Wo_21.9), subcalcic augite (Fs_1.7Wo_32.4), diopside (Fs_0.9Wo_44.8). Magnetic susceptibility log χ (× 10^-9 m³/kg) = 4.11.

Classification: Ordinary chondrite (LL3).

Specimens: 16.7 g including one polished thin section at UWB; remainder with Mr. M. Arjdal.

Data from:
  MB109
  Table 0
  Line 0:

Place of purchase:	Timbuktu, Mali
Date:	P 2019 Aug
Mass (g):	83
Pieces:	1
Class:	LL3
Shock stage:	S2
Weathering grade:	W1
Fayalite (mol%):	23.6±13.7
Ferrosilite (mol%):	15.8±7.1
Wollastonite (mol%):	0.8±1.1
Classifier:	A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):	16.7
Type spec location:	UWB
Main mass:	M. Arjdal
Comments:	Work name Arj AG1; 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. 109, in preparation (2020)

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Geography:

Mali

Coordinates:

Unknown.

Statistics:
This is 1 of 92 approved meteorites from Mali (plus 2 unapproved names)

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