Meteoritical Bulletin: Entry for Northwest Africa 13221

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Northwest Africa 13221

Basic information

Name: Northwest Africa 13221
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13221
Observed fall: No
Year found: 2019
Country: Mali
Mass: 1097 g

Classification
history:

Recommended:

L4 [explanation]

This is 1 of 2027 approved meteorites (plus 4 unapproved names) classified as L4. [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 23 Feb 2020

Writeup

Writeup from MB 109:

Northwest Africa 13221 (NWA 13221)

Mali

Purchased: 2019 Sep

Classification: Ordinary chondrite (L4)

History: Purchased by Mbark Arjdal in September 2019 from an Algerian dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Well-formed chondrules are set in a recrystallized matrix containing merrillite, chlorapatite, taenite, chromite, troilite, stained kamacite and pentlandite.

Geochemistry: Olivine (Fa_24.9±0.1, range Fa_24.8-25.1, N = 6), low-Ca pyroxene (Fs_20.3±0.3Wo_2.2±0.7, range Fs_19.8-20.5Wo_1.7-3.7, N = 6), augite (Fs_8.8±0.9Wo_43.5±1.5, range Fs_7.8-9.6Wo_45.1-42.2, N = 3).

Classification: Ordinary chondrite (L4).

Specimens: 66.9 g including one polished thin section at UWB; remainder with Mr. M. Arjdal.

Data from:
  MB109
  Table 0
  Line 0:

Place of purchase:	Algeria
Date:	P 2019 Sep
Mass (g):	1097
Pieces:	4
Class:	L4
Shock stage:	S2
Weathering grade:	W0/1
Fayalite (mol%):	24.9±0.1
Ferrosilite (mol%):	20.3±0.3
Wollastonite (mol%):	2.2±0.7
Classifier:	A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):	66.9
Type spec location:	UWB
Main mass:	M. Arjdal
Comments:	Work name Arj ZM 136; 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 100 approved meteorites from Mali (plus 2 unapproved names)

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