Meteoritical Bulletin: Entry for Northwest Africa 13755

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Northwest Africa 13755

Basic information

Name: Northwest Africa 13755
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13755
Observed fall: No
Year found: 2020
Country: Mali
Mass: 125 g

Classification
history:

Recommended:

LL3 [explanation]

This is 1 of 365 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 21 Feb 2021

Writeup

Writeup from MB 110:

Northwest Africa 13755 (NWA 13755)

Mali

Purchased: 2020 Jan

Classification: Ordinary chondrite (LL3)

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

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Well-formed, closely-packed glass-bearing chondrules (apparent diameter 920±510 µm, N = 25) are set in a fine grained matrix containing stained kamacite, troilite, taenite and low-Ti chromite.

Geochemistry: Olivine (Fa_24.9±14.7, range Fa_2.9-38.2, N = 7), low-Ca pyroxene (Fs_18.5±3.3Wo_3.0±2.5, range Fs_13.8-22.4Wo_0.4-6.1, N = 5), subcalcic augite (Fs_17.9Wo_20.4; Fs_22.2Wo_34.0; N = 2). Magnetic susceptibility log χ (× 10^-9 m³/kg) = 3.53.

Classification: Ordinary chondrite (LL3).

Specimens: 24.4 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):	125
Pieces:	1
Class:	LL3
Shock stage:	S2
Weathering grade:	W1
Fayalite (mol%):	24.9±14.7
Ferrosilite (mol%):	18.5±3.3
Wollastonite (mol%):	3.0±2.5
Magnetic suscept.:	3.53
Classifier:	A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):	24.2
Type spec location:	UWB
Main mass:	M. Arjdal
Finder:	anonymous
Comments:	Work name Arj ZM 370; 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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Geography:

Mali

Coordinates:

Unknown.

Statistics:
This is 1 of 46 approved meteorites from Mali (plus 1 unapproved name)

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